USRE40149E1 - Method and apparatus for RF common-mode noise rejection in a DSL receiver - Google Patents
Method and apparatus for RF common-mode noise rejection in a DSL receiver Download PDFInfo
- Publication number
- USRE40149E1 USRE40149E1 US10/956,017 US95601704A USRE40149E US RE40149 E1 USRE40149 E1 US RE40149E1 US 95601704 A US95601704 A US 95601704A US RE40149 E USRE40149 E US RE40149E
- Authority
- US
- United States
- Prior art keywords
- signal
- differential
- common
- mode
- receiver according
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Images
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/0264—Arrangements for coupling to transmission lines
- H04L25/0272—Arrangements for coupling to multiple lines, e.g. for differential transmission
- H04L25/0274—Arrangements for ensuring balanced coupling
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/02—Details
- H04B3/30—Reducing interference caused by unbalance current in a normally balanced line
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/0264—Arrangements for coupling to transmission lines
- H04L25/0292—Arrangements specific to the receiver end
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/10—Compensating for variations in line balance
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/0002—Modulated-carrier systems analog front ends; means for connecting modulators, demodulators or transceivers to a transmission line
Definitions
- the present invention relates generally to high-speed data communications over telephone cables, and specifically to methods and systems for rejection of radio frequency (RF) noise in Digital Subscriber Line (DSL) modems.
- RF radio frequency
- Digital Subscriber Line is a modem technology that enables broadband digital data to be transmitted over twisted-pair wire. This is the type of infrastructure that links most home and small business subscribers to their telephone service providers. DSL modems enable users to access digital networks at speeds tens to hundreds of times faster than current analog modems and basic ISDN service. DSL thus opens the most critical bottleneck in local-loop access to high-speed networks, such as Asynchronous Transfer Mode (ATM) and Internet Protocol (IP) networks, without requiring major investments in new infrastructure. DSL systems use special line signals that are well-adapted to the characteristics of twisted-pair wire and to the noise that normally exists on telephone lines.
- ATM Asynchronous Transfer Mode
- IP Internet Protocol
- a range of DSL standards have been defined, known generically as “xDSL,” wherein the various standards have different data rates and other associated features but share common principles of operation. These standards include High-Speed DSL (HDSL), at relative low frequencies ( ⁇ 500 kHz); Asymmetric DSL (ADSL), with an intermediate frequency range (30 ⁇ 1100 kHz); and Very High Speed DSL (VDSL), in a high frequency range (0.3-20 MHz). VDSL modems support the highest possible bit rates on existing twisted-pair wire. Downstream bit rates of up to 50Mb/sec support such demanding services as video on demand. It is expected that in the near future, VDSL systems will come to dominate subscriber equipment on the telephone network.
- HDSL High-Speed DSL
- ADSL Asymmetric DSL
- VDSL Very High Speed DSL
- VDSL modems support the highest possible bit rates on existing twisted-pair wire. Downstream bit rates of up to 50Mb/sec support such demanding services as video on demand. It is expected that in the near future, V
- VDSL implementation One problem of VDSL implementation is that the frequency band of VDSL (up to 20 MHz) overlaps with several RF bands used for amateur radio and radio broadcast transmissions. To avoid interference between VDSL and RF systems, new standards propose that VDSL systems not transmit in RF bands assigned for radio use. But to avoid interference from existing RF systems, VDSL modems must be designed with reduced sensitivity to RF signals. Twisted-pair wire is particularly prone to picking up interference signals from external RF sources. This problem becomes more severe the higher the transmission frequency and can cause significant degradation of VDSL signals.
- One method known in the art for rejection of RF interference signals is to use a common mode choke in the twisted-pair telephone line.
- the common mode choke attenuates RF noise by about 30 dB, but this attenuation is not enough for long cables, wherein the VDSL line signal is typically very small and the RF noise may be large.
- noise cancellation Another method for decreasing sensitivity to RF interference is noise cancellation, as described, for example, in PCT Patent Application PCT/US97/06381, published as WO 97/40587, whose disclosure is incorporated herein by reference.
- This application describes a receiver system for high-speed data communications, such as ADSL or VDSL, having a RF noise canceller.
- the noise canceller adaptively estimates the radio frequency noise coming into the receiver through twisted pair input lines. The estimate is used to generate a noise cancellation signal, which is subtracted from the signals coming into the receiver.
- the noise estimate is based on a common-mode reference noise signal, which is sampled at a transformer that couples the input lines to the receiver.
- the preferred source of the common-mode signal is from a center tap on the input side of the transformer, taken with reference to a chassis ground. It is noted that the common-mode signal could alternatively be obtained from one of the input lines or from the sum of the lines with respect to ground.
- a common-mode choke used at the input to a high-speed data receiver, has three windings on a common core.
- the receiver typically comprises a DSL receiver.
- Two of the windings termed herein signal windings, are coupled in series with respective input lines carrying an input signal to the receiver.
- the signal windings are wound together in parallel, preferably using bifilar wire, so as to present a high effective impedance to common-mode RF interference on the input lines, while presenting a low effective impedance to a differential signal between the input lines.
- the choke thus attenuates the RF interference relative to the signal.
- the third winding termed herein a sampling winding, samples the RF common-mode interference on the line.
- the sampled RF interference is used by a noise cancellation circuit in the receiver to estimate and subtract out interference remaining in the input signal following the choke.
- the three-winding choke of the present invention thus provides two stages of interference suppression in a single device: a first stage of attenuation by the high common-mode impedance of the choke itself, and a second stage of RF noise suppression by the noise cancellation circuit. It thus provides superior attenuation of RF interference, without the need for a resistive tap off the input lines to the receiver, as is used in noise cancellation circuits known in the art, such as that described in the above-mentioned PCT patent application. Therefore, it also eliminates the requirement that the sampled common-mode interference signal be referred to ground, and protects the noise cancellation circuit from high-voltage surges.
- the high-speed data receiver is used in a DSL modem, most preferably in a VDSL modem. It will be appreciated, however, that the principles of the present invention may similarly be applied to high-speed data receivers of other types.
- a receiver for high-speed data communications which is adapted to receive a differential signal through a pair of signal lines, the receiver including:
- the sampled signal is generated responsive to the common-mode interference, and the circuitry processes the differential signal to cancel the attenuated common-mode interference out of the differential signal.
- the circuitry processes the sampled signal to derive an estimate of the common-mode interference, which is subtracted from the differential signal.
- the sampled signal is conveyed to the processing circuitry substantially without reference to a ground.
- the sampling winding is electrically isolated from the signal windings.
- the receiver includes a transformer, which includes a primary winding coupled to receive the differential signal from the signal windings of the choke and a secondary winding coupled to convey the differential signal to the signal processing circuitry, wherein the primary winding includes a center tap which is grounded.
- the pair of signal lines includes a twisted pair of lines.
- the differential signal includes a Digital Subscriber Line (DSL) signal
- the signal processing circuitry includes modem circuitry for decoding the DSL signal, most preferably a Very High Rate Digital Subscriber Line (VDSL) signal.
- DSL Digital Subscriber Line
- VDSL Very High Rate Digital Subscriber Line
- the first and second signal windings are wound together in a common winding direction and have substantially equal respective inductances.
- the common-mode choke includes a core upon which the signal windings and the sampling winding are commonly wound.
- the sampling winding is electrically isolated from the signal windings.
- method for processing a differential signal received on a pair of signal lines including:
- FIG. 1 is a schematic circuit diagram showing a high-frequency data receiver with a three-winding common-mode choke and a noise cancellation circuit, in accordance with a preferred embodiment of the present invention.
- FIG. 2 is a simplified, pictorial illustration of a three-winding common-mode choke, in accordance with a preferred embodiment of the present invention.
- FIG. 1 is a schematic circuit diagram showing a receiver 50 for high-speed data signals, in accordance with a preferred embodiment of the present invention.
- Signals are input to the receiver from input lines 20 and 22 through a common-mode choke 52 .
- the input lines are twisted pair telephone wires, and the receiver is part of a VDSL modem.
- receiver 50 may be coupled to input lines of other types and may be adapted to receive and process signals transmitted in accordance with other standards, as are known in the art.
- Choke 52 comprises parallel signal windings 24 and 26 .
- the output of choke 52 is coupled via capacitors 28 , serving as a high pass filter, to a primary winding 32 of a transformer 30 .
- a secondary winding 34 of the transformer is coupled to processing circuitry 64 , which processes the signals as described further hereinbelow.
- primary winding 32 has a center tap 36 , which is grounded through a capacitor 66 , in order to ensure that the input impedance of the receiver is substantially symmetrical in relation to input lines 20 and 22 .
- a center tap of this sort is used for sampling the common-mode noise.
- Windings 24 and 26 preferably have substantially equal inductances, L 1 and L 2 , respectively, which are on the order of 1 mH.
- the windings are wound in parallel and in the same direction, so that choke 52 presents a high overall inductance L common to common-mode interference (or noise) entering receiver 50 through both of lines 20 and 22 .
- Choke 52 thus attenuates common-mode interference substantially relative to the data signal, typically by at least 30 dB.
- Signals received from secondary winding 34 of transformer 30 are amplified by a differential amplifier 38 and digitized by an analog/digital (A/D) converter 40 , as is known in the art.
- a digital signal processor (DSP) 62 decodes the digitized signals so as to provide a data output to a computer or other terminal equipment.
- the DSP also performs a noise cancellation function, as described hereinbelow.
- Choke 52 further comprises a sampling winding 54 , which is inductively coupled to signal windings 24 and 26 .
- Winding 54 picks up RF interference signals on windings 24 and 26 , and particularly common-mode interference from sources such as ham radio broadcasts.
- the sampling winding is coupled to a differential amplifier 56 having a variable gain, which is adjusted based on the level of interference picked up by the winding.
- the amplified interference signal is preferably filtered by a band-pass filter 58 to eliminate interference outside a frequency range of interest to receiver 50 , generally corresponding to the range of interfering RF signals.
- An A/D converter 60 digitizes the interference signals and passes the resultant digital data to DSP 62 .
- the DSP uses the digitized interference signals to make an estimate of the interference that is mixed in with the data signals received from transformer 30 . This is the residual noise that has not been attenuated by windings 24 and 26 of choke 52 . Any suitable method of noise estimation known in the art may be used in making the estimate. Preferred methods for this purpose are described in a U.S. patent application entitled, “Radio Frequency Interference Canceller,” filed on even date, which is assigned to the assignee of the present patent application, and whose disclosure is incorporated herein by reference.
- the estimated interference is subtracted out of the data signals received by the DSP from A/D converter 40 , so that the residual noise is cancelled out of the signals to an extent sufficient to enable the DSP to decode the data accurately and efficiently.
- the estimated interference based on the signals sampled by sampling winding 54 may be applied to cancel the residual noise at a different point in circuitry 64 .
- the interference may be subtracted out of the analog signal output by amplifier 38 by an analog subtractor (not shown in the figures).
- an analog subtractor not shown in the figures.
- Other applications of the signals sampled by winding 54 in processing the main signals conveyed by windings 24 and 26 will be apparent to those skilled in the art and are considered to be within the scope of the present invention.
- FIG. 2 is a schematic, pictorial illustration of common-mode choke 52 , particularly adapted for use in receiver 50 , in accordance with a preferred embodiment of the present invention.
- Signal windings 24 and 26 are wound together, in the same direction, around a toroidal core 70 so as to have respective inductances that are as closely as possible identical.
- Windings 24 and 26 preferably comprise triple-isolated bifilar wire, as is known in the art.
- Core 70 preferably comprises a high-frequency ferrite with high magnetic permeability, such as Philips 3F3, and is most preferably grounded.
- Sampling winding 54 is wound on the core so that it picks up the common-mode interference signals that are carried by both of windings 24 and 26 (and generate magnetic fields accordingly in core 70 ), while receiving almost none of the differential data signals running between the windings.
- a winding ratio of the sampling winding relative to the signal windings on the order of 1:100 is estimated to provide an optimal sampling output for purposes of noise estimation. It will be understood, however, that different winding ratios and different choke geometries and materials may also be used, depending on application requirements.
- sampling winding 54 is spaced sufficiently far from signal windings 24 and 26 so as to provide electrical isolation of the sampling winding against electrical surges in lines 20 and 22 .
- These surges may be caused, for example, by lightning, and transformer 30 is required to be capable of isolating circuitry 64 from the effects of such a surge.
- Appropriate design of choke 52 alleviates the need for an additional isolation transformer, which would otherwise be required in the interference sampling circuit.
Abstract
Description
-
- a common-mode choke, including:
- first and second signal windings, which are configured to be respectively coupled in series to the pair of signal lines so as to attenuate common-mode interference in the differential signal; and
- a sampling winding, which is inductively coupled to the signal windings so as to generate a sampled signal responsive to current flowing in the signal windings; and
- signal processing circuitry, which is coupled to receive the sampled signal from the sampling winding and to receive the differential signal from the signal windings and to process the differential signal responsive to the sampled signal.
-
- coupling a pair of inductive elements in series with the respective signal lines so as to attenuate commonmode interference in the lines relative to the differential signal;
- inductively sampling electrical currents in the inductive elements so as to generate a sampled signal; and
- processing the differential signal responsive to the sampled signal so as to enhance a signal-to-noise characteristic of the differential signal following the inductive elements.
Claims (27)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/956,017 USRE40149E1 (en) | 1999-12-30 | 2004-09-30 | Method and apparatus for RF common-mode noise rejection in a DSL receiver |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/476,746 US6459739B1 (en) | 1999-12-30 | 1999-12-30 | Method and apparatus for RF common-mode noise rejection in a DSL receiver |
US10/956,017 USRE40149E1 (en) | 1999-12-30 | 2004-09-30 | Method and apparatus for RF common-mode noise rejection in a DSL receiver |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09/476,746 Reissue US6459739B1 (en) | 1999-12-30 | 1999-12-30 | Method and apparatus for RF common-mode noise rejection in a DSL receiver |
Publications (1)
Publication Number | Publication Date |
---|---|
USRE40149E1 true USRE40149E1 (en) | 2008-03-11 |
Family
ID=23893086
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09/476,746 Ceased US6459739B1 (en) | 1999-12-30 | 1999-12-30 | Method and apparatus for RF common-mode noise rejection in a DSL receiver |
US10/956,017 Expired - Lifetime USRE40149E1 (en) | 1999-12-30 | 2004-09-30 | Method and apparatus for RF common-mode noise rejection in a DSL receiver |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09/476,746 Ceased US6459739B1 (en) | 1999-12-30 | 1999-12-30 | Method and apparatus for RF common-mode noise rejection in a DSL receiver |
Country Status (5)
Country | Link |
---|---|
US (2) | US6459739B1 (en) |
EP (1) | EP1245084B1 (en) |
AU (1) | AU1410001A (en) |
DE (1) | DE60005714T2 (en) |
WO (1) | WO2001050623A1 (en) |
Cited By (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8284007B1 (en) | 2008-09-25 | 2012-10-09 | Aquantia Corporation | Magnetic package for a communication system |
US8320411B1 (en) | 2009-01-29 | 2012-11-27 | Aquantia Corporation | Fast retraining for transceivers in communication systems |
US8442099B1 (en) | 2008-09-25 | 2013-05-14 | Aquantia Corporation | Crosstalk cancellation for a common-mode channel |
US8625704B1 (en) | 2008-09-25 | 2014-01-07 | Aquantia Corporation | Rejecting RF interference in communication systems |
US8724678B2 (en) | 2010-05-28 | 2014-05-13 | Aquantia Corporation | Electromagnetic interference reduction in wireline applications using differential signal compensation |
US8792597B2 (en) | 2010-06-18 | 2014-07-29 | Aquantia Corporation | Reducing electromagnetic interference in a receive signal with an analog correction signal |
US8861663B1 (en) | 2011-12-01 | 2014-10-14 | Aquantia Corporation | Correlated noise canceller for high-speed ethernet receivers |
US8891595B1 (en) | 2010-05-28 | 2014-11-18 | Aquantia Corp. | Electromagnetic interference reduction in wireline applications using differential signal compensation |
US8929468B1 (en) | 2012-06-14 | 2015-01-06 | Aquantia Corp. | Common-mode detection with magnetic bypass |
US9118469B2 (en) | 2010-05-28 | 2015-08-25 | Aquantia Corp. | Reducing electromagnetic interference in a received signal |
US10771100B1 (en) | 2019-03-22 | 2020-09-08 | Marvell Asia Pte., Ltd. | Method and apparatus for efficient fast retraining of ethernet transceivers |
US11115151B1 (en) | 2019-03-22 | 2021-09-07 | Marvell Asia Pte, Ltd. | Method and apparatus for fast retraining of ethernet transceivers based on trickling error |
US11228465B1 (en) | 2019-03-22 | 2022-01-18 | Marvell Asia Pte, Ltd. | Rapid training method for high-speed ethernet |
Families Citing this family (63)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5914613A (en) | 1996-08-08 | 1999-06-22 | Cascade Microtech, Inc. | Membrane probing system with local contact scrub |
US6256882B1 (en) | 1998-07-14 | 2001-07-10 | Cascade Microtech, Inc. | Membrane probing system |
US6816499B1 (en) * | 1999-06-11 | 2004-11-09 | International Business Machines Corporation | High speed token ring port configuror |
US6914423B2 (en) | 2000-09-05 | 2005-07-05 | Cascade Microtech, Inc. | Probe station |
US6965226B2 (en) | 2000-09-05 | 2005-11-15 | Cascade Microtech, Inc. | Chuck for holding a device under test |
DE10143173A1 (en) | 2000-12-04 | 2002-06-06 | Cascade Microtech Inc | Wafer probe has contact finger array with impedance matching network suitable for wide band |
US7065143B1 (en) * | 2001-02-26 | 2006-06-20 | Nortel Networks Limited | Method and design for increasing signal to noise ratio in xDSL modems |
WO2003052435A1 (en) | 2001-08-21 | 2003-06-26 | Cascade Microtech, Inc. | Membrane probing system |
WO2003100445A2 (en) * | 2002-05-23 | 2003-12-04 | Cascade Microtech, Inc. | Probe for testing a device under test |
US8126078B2 (en) * | 2003-01-28 | 2012-02-28 | Agere Systems Inc. | Method and apparatus for reducing noise in an unbalanced channel using common mode component |
US7057404B2 (en) * | 2003-05-23 | 2006-06-06 | Sharp Laboratories Of America, Inc. | Shielded probe for testing a device under test |
US7492172B2 (en) | 2003-05-23 | 2009-02-17 | Cascade Microtech, Inc. | Chuck for holding a device under test |
US7315592B2 (en) * | 2003-09-08 | 2008-01-01 | Aktino, Inc. | Common mode noise cancellation |
US7250626B2 (en) | 2003-10-22 | 2007-07-31 | Cascade Microtech, Inc. | Probe testing structure |
KR100960496B1 (en) * | 2003-10-31 | 2010-06-01 | 엘지디스플레이 주식회사 | Rubbing method of liquid crystal display device |
US7187188B2 (en) | 2003-12-24 | 2007-03-06 | Cascade Microtech, Inc. | Chuck with integrated wafer support |
JP2007517231A (en) | 2003-12-24 | 2007-06-28 | カスケード マイクロテック インコーポレイテッド | Active wafer probe |
US8139759B2 (en) * | 2004-04-16 | 2012-03-20 | Panasonic Corporation | Line state detecting apparatus and transmitting apparatus and receiving apparatus of balanced transmission system |
WO2006031646A2 (en) | 2004-09-13 | 2006-03-23 | Cascade Microtech, Inc. | Double sided probing structures |
WO2006042274A1 (en) | 2004-10-11 | 2006-04-20 | 2Wire, Inc. | Periodic impulse noise mitigation in a dsl system |
US7953163B2 (en) | 2004-11-30 | 2011-05-31 | Broadcom Corporation | Block linear equalization in a multicarrier communication system |
US7369605B2 (en) * | 2004-12-15 | 2008-05-06 | Spirent Communications | Method and device for injecting a differential current noise signal into a paired wire communication link |
US7535247B2 (en) | 2005-01-31 | 2009-05-19 | Cascade Microtech, Inc. | Interface for testing semiconductors |
US7656172B2 (en) | 2005-01-31 | 2010-02-02 | Cascade Microtech, Inc. | System for testing semiconductors |
US7852950B2 (en) | 2005-02-25 | 2010-12-14 | Broadcom Corporation | Methods and apparatuses for canceling correlated noise in a multi-carrier communication system |
US9374257B2 (en) | 2005-03-18 | 2016-06-21 | Broadcom Corporation | Methods and apparatuses of measuring impulse noise parameters in multi-carrier communication systems |
JP5080459B2 (en) * | 2005-06-13 | 2012-11-21 | カスケード マイクロテック インコーポレイテッド | Wideband active / passive differential signal probe |
US7813439B2 (en) | 2006-02-06 | 2010-10-12 | Broadcom Corporation | Various methods and apparatuses for impulse noise detection |
US7764072B2 (en) | 2006-06-12 | 2010-07-27 | Cascade Microtech, Inc. | Differential signal probing system |
US7403028B2 (en) * | 2006-06-12 | 2008-07-22 | Cascade Microtech, Inc. | Test structure and probe for differential signals |
US7723999B2 (en) | 2006-06-12 | 2010-05-25 | Cascade Microtech, Inc. | Calibration structures for differential signal probing |
US8144807B2 (en) * | 2007-07-30 | 2012-03-27 | Texas Instruments Incorporated | Crosstalk cancellation in digital subscriber line communications |
US7876114B2 (en) | 2007-08-08 | 2011-01-25 | Cascade Microtech, Inc. | Differential waveguide probe |
US8089266B2 (en) * | 2008-08-06 | 2012-01-03 | Robert Bosch Gmbh | Measuring induced currents on a CAN bus |
US7888957B2 (en) | 2008-10-06 | 2011-02-15 | Cascade Microtech, Inc. | Probing apparatus with impedance optimized interface |
US8605837B2 (en) | 2008-10-10 | 2013-12-10 | Broadcom Corporation | Adaptive frequency-domain reference noise canceller for multicarrier communications systems |
US8472532B2 (en) * | 2008-10-30 | 2013-06-25 | 2Wire, Inc. | Method and apparatus for generating a common-mode reference signal |
WO2010059247A2 (en) | 2008-11-21 | 2010-05-27 | Cascade Microtech, Inc. | Replaceable coupon for a probing apparatus |
US8319503B2 (en) | 2008-11-24 | 2012-11-27 | Cascade Microtech, Inc. | Test apparatus for measuring a characteristic of a device under test |
KR101657215B1 (en) * | 2009-09-08 | 2016-09-19 | 삼성디스플레이 주식회사 | Display device including touch panel device and coupling-noise elliminating method |
CN101795147B (en) * | 2010-04-08 | 2013-04-24 | 福建星网锐捷网络有限公司 | Method and device for reducing noise in twisted-pair connecting mode and network equipment |
JP2013106475A (en) * | 2011-11-15 | 2013-05-30 | Toshiba Corp | System connection inverter |
JP5754779B2 (en) * | 2012-01-13 | 2015-07-29 | Necネットワークプロダクツ株式会社 | Noise suppression circuit and noise suppression method |
JP5860338B2 (en) * | 2012-04-26 | 2016-02-16 | 株式会社サンコーシヤ | Isolator for communication line |
US8755449B2 (en) * | 2012-05-14 | 2014-06-17 | Microsemi Corporation | Power over Ethernet for bi-directional Ethernet over single pair |
WO2014101088A1 (en) * | 2012-12-28 | 2014-07-03 | Silicon Image, Inc. | Compensation scheme for mhl common mode clock swing |
EP2782105B1 (en) * | 2013-03-20 | 2018-03-21 | Schneider Toshiba Inverter Europe SAS | Differential mode and common mode choke |
FR3029370A1 (en) * | 2014-12-02 | 2016-06-03 | Orange | NOISE CANCELLATION METHOD AND DEVICE FOR BIFILAR TRANSMISSION SYSTEMS |
US10135626B2 (en) * | 2015-04-14 | 2018-11-20 | Avago Technologies General Ip (Singapore) Pte. Ltd. | Power coupling circuits for single-pair ethernet with automotive applications |
US9602317B1 (en) * | 2015-10-12 | 2017-03-21 | Qualcomm Incorporated | Apparatus and method for combining currents from passive equalizer in sense amplifier |
DE102016110596B4 (en) * | 2016-06-08 | 2019-12-19 | Technische Universität Dortmund | Active interference suppression device, method for active interference suppression |
FR3055063B1 (en) | 2016-08-11 | 2018-08-31 | Soitec | METHOD OF TRANSFERRING A USEFUL LAYER |
US11290291B2 (en) * | 2018-07-31 | 2022-03-29 | Analog Devices International Unlimited Company | Power over data lines system with combined dc coupling and common mode termination circuitry |
KR20210151948A (en) | 2019-05-03 | 2021-12-14 | 마이크로칩 테크놀로지 인코포레이티드 | Collision emulation and related systems, methods, and devices in wired local area networks |
US11418369B2 (en) * | 2019-08-01 | 2022-08-16 | Analog Devices International Unlimited Company | Minimizing DC bias voltage difference across AC-blocking capacitors in PoDL system |
CN112422295B (en) | 2019-08-23 | 2023-06-13 | 微芯片技术股份有限公司 | Ethernet interface and related system, method and equipment |
CN112415323A (en) | 2019-08-23 | 2021-02-26 | 微芯片技术股份有限公司 | Diagnosing cable faults within a network |
CN112422153B (en) | 2019-08-23 | 2023-04-07 | 微芯片技术股份有限公司 | Method and system for processing data reception after detecting collisions at a shared transmission medium |
CN112423403A (en) | 2019-08-23 | 2021-02-26 | 微芯片技术股份有限公司 | Detecting conflicts on a network |
CN112422219A (en) | 2019-08-23 | 2021-02-26 | 微芯片技术股份有限公司 | Ethernet interface and related systems, methods and devices |
CN112491435B (en) | 2019-08-23 | 2022-11-18 | 微芯片技术股份有限公司 | Circuit of physical layer including transceiver and driver architecture |
CN112422385B (en) | 2019-08-23 | 2022-11-29 | 微芯片技术股份有限公司 | Interface for improved media access and related systems, methods and devices |
DE112021001780T5 (en) | 2020-03-24 | 2023-01-05 | Microchip Technology Incorporated | LOW LINK COUNT INTERFACE WAKE SOURCE COMMUNICATIONS ACCORDING TO LOCAL AND REMOTE 10SPE WAKE AND RELATED SYSTEMS, PROCEDURES AND DEVICES |
Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5223806A (en) * | 1991-08-23 | 1993-06-29 | Digital Equipment Corporation | Method and apparatus for reducing electromagnetic interference and emission associated with computer network interfaces |
EP0626767A2 (en) * | 1993-05-26 | 1994-11-30 | Nippon Telegraph And Telephone Corporation | EMC filter for a balanced multi-wired telecommunication line |
WO1997040587A1 (en) * | 1996-04-19 | 1997-10-30 | Amati Communications Corporation | Radio frequency noise canceller |
US5832032A (en) * | 1995-11-09 | 1998-11-03 | Northern Telecom Limited | Interference reduction in telecommunications systems |
WO1999063675A1 (en) * | 1998-06-04 | 1999-12-09 | Bell Canada | Suppression of rfi and impulse noise in communications channels |
US6052420A (en) * | 1997-05-15 | 2000-04-18 | Northern Telecom Limited | Adaptive multiple sub-band common-mode RFI suppression |
US6173021B1 (en) * | 1997-06-23 | 2001-01-09 | Paradyne Corporation | Method and apparatus for reducing interference in a twisted wire pair transmission system |
US6683913B1 (en) * | 1999-12-30 | 2004-01-27 | Tioga Technologies Inc. | Narrowband noise canceller |
US6803859B2 (en) * | 2000-01-05 | 2004-10-12 | Inductive Signature Technologies, Inc. | Method and apparatus for active isolation in inductive loop detectors |
-
1999
- 1999-12-30 US US09/476,746 patent/US6459739B1/en not_active Ceased
-
2000
- 2000-11-15 WO PCT/IL2000/000755 patent/WO2001050623A1/en active IP Right Grant
- 2000-11-15 AU AU14100/01A patent/AU1410001A/en not_active Abandoned
- 2000-11-15 EP EP00976226A patent/EP1245084B1/en not_active Expired - Lifetime
- 2000-11-15 DE DE60005714T patent/DE60005714T2/en not_active Expired - Lifetime
-
2004
- 2004-09-30 US US10/956,017 patent/USRE40149E1/en not_active Expired - Lifetime
Patent Citations (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5223806A (en) * | 1991-08-23 | 1993-06-29 | Digital Equipment Corporation | Method and apparatus for reducing electromagnetic interference and emission associated with computer network interfaces |
EP0626767A2 (en) * | 1993-05-26 | 1994-11-30 | Nippon Telegraph And Telephone Corporation | EMC filter for a balanced multi-wired telecommunication line |
US5832032A (en) * | 1995-11-09 | 1998-11-03 | Northern Telecom Limited | Interference reduction in telecommunications systems |
WO1997040587A1 (en) * | 1996-04-19 | 1997-10-30 | Amati Communications Corporation | Radio frequency noise canceller |
US6052420A (en) * | 1997-05-15 | 2000-04-18 | Northern Telecom Limited | Adaptive multiple sub-band common-mode RFI suppression |
US6173021B1 (en) * | 1997-06-23 | 2001-01-09 | Paradyne Corporation | Method and apparatus for reducing interference in a twisted wire pair transmission system |
WO1999063675A1 (en) * | 1998-06-04 | 1999-12-09 | Bell Canada | Suppression of rfi and impulse noise in communications channels |
US6546057B1 (en) * | 1998-06-04 | 2003-04-08 | Bell Canada | Suppression of radio frequency interference and impulse noise in communications channels |
US6683913B1 (en) * | 1999-12-30 | 2004-01-27 | Tioga Technologies Inc. | Narrowband noise canceller |
US6803859B2 (en) * | 2000-01-05 | 2004-10-12 | Inductive Signature Technologies, Inc. | Method and apparatus for active isolation in inductive loop detectors |
Non-Patent Citations (1)
Title |
---|
Cioffi, J. et al, "Analog RF Cancellation with SDMT (96-084)", T1E1.4 VDSL (Project), Amati Communications Corp., Mt. View, Calif. (USA), pp. 1-9, Apr. 22, 1996. * |
Cited By (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9912375B1 (en) | 2008-09-25 | 2018-03-06 | Aquantia Corp. | Cancellation of alien interference in communication systems |
US9590695B1 (en) | 2008-09-25 | 2017-03-07 | Aquantia Corp. | Rejecting RF interference in communication systems |
US8442099B1 (en) | 2008-09-25 | 2013-05-14 | Aquantia Corporation | Crosstalk cancellation for a common-mode channel |
US8625704B1 (en) | 2008-09-25 | 2014-01-07 | Aquantia Corporation | Rejecting RF interference in communication systems |
US8928425B1 (en) | 2008-09-25 | 2015-01-06 | Aquantia Corp. | Common mode detector for a communication system |
US8284007B1 (en) | 2008-09-25 | 2012-10-09 | Aquantia Corporation | Magnetic package for a communication system |
US8320411B1 (en) | 2009-01-29 | 2012-11-27 | Aquantia Corporation | Fast retraining for transceivers in communication systems |
US9118469B2 (en) | 2010-05-28 | 2015-08-25 | Aquantia Corp. | Reducing electromagnetic interference in a received signal |
US8724678B2 (en) | 2010-05-28 | 2014-05-13 | Aquantia Corporation | Electromagnetic interference reduction in wireline applications using differential signal compensation |
US8891595B1 (en) | 2010-05-28 | 2014-11-18 | Aquantia Corp. | Electromagnetic interference reduction in wireline applications using differential signal compensation |
US8792597B2 (en) | 2010-06-18 | 2014-07-29 | Aquantia Corporation | Reducing electromagnetic interference in a receive signal with an analog correction signal |
US8861663B1 (en) | 2011-12-01 | 2014-10-14 | Aquantia Corporation | Correlated noise canceller for high-speed ethernet receivers |
US8929468B1 (en) | 2012-06-14 | 2015-01-06 | Aquantia Corp. | Common-mode detection with magnetic bypass |
US10771100B1 (en) | 2019-03-22 | 2020-09-08 | Marvell Asia Pte., Ltd. | Method and apparatus for efficient fast retraining of ethernet transceivers |
US11115151B1 (en) | 2019-03-22 | 2021-09-07 | Marvell Asia Pte, Ltd. | Method and apparatus for fast retraining of ethernet transceivers based on trickling error |
US11228465B1 (en) | 2019-03-22 | 2022-01-18 | Marvell Asia Pte, Ltd. | Rapid training method for high-speed ethernet |
Also Published As
Publication number | Publication date |
---|---|
WO2001050623A1 (en) | 2001-07-12 |
US6459739B1 (en) | 2002-10-01 |
EP1245084A1 (en) | 2002-10-02 |
DE60005714D1 (en) | 2003-11-06 |
EP1245084B1 (en) | 2003-10-01 |
AU1410001A (en) | 2001-07-16 |
DE60005714T2 (en) | 2004-07-29 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
USRE40149E1 (en) | Method and apparatus for RF common-mode noise rejection in a DSL receiver | |
US7573943B2 (en) | Interference cancellation system | |
US8472532B2 (en) | Method and apparatus for generating a common-mode reference signal | |
US6396392B1 (en) | High frequency network communications over various lines | |
US8472533B2 (en) | Reduced-complexity common-mode noise cancellation system for DSL | |
US20060029215A1 (en) | Lightning protection circuit | |
US6831975B1 (en) | Digital subscriber line (DSL) modem compatible with home networks | |
JP2005516523A (en) | High-frequency network multiplexed communication over various lines using multiple modulated carrier frequencies | |
EP0774187A1 (en) | Electromagnetic interference isolator | |
EP1952206A2 (en) | Power line coupling device and method of using the same | |
US7003094B2 (en) | Adaptive interference cancellation for ADSL | |
US6477212B1 (en) | Method and apparatus for reducing interference in a twisted wire pair transmission system | |
US8005206B1 (en) | VDSL splitter | |
JP2005524321A (en) | Full duplex for power line data communication | |
US20050018596A1 (en) | System for crosstalk noise reduction on twisted pair, ethernet, polyphase and shielded wire systems | |
EP1675288A2 (en) | An arrangement for the transmission of a data signal in a cable television network | |
US7453943B2 (en) | Hybrid circuit for broadband modems | |
US6977958B1 (en) | Differentially-driven loop extender | |
US20010033651A1 (en) | Method and apparatus for connecting broadband voice and data signals to telephone systems | |
JP2002532978A (en) | Telecommunications system and connection equipment used therein | |
WO2001063866A1 (en) | Dsl repeater |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: STMICROELECTRONICS, N.V., NETHERLANDS Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:TIOGA TECHNOLOGIES, INC.;REEL/FRAME:017278/0246 Effective date: 20050422 |
|
AS | Assignment |
Owner name: STMICROELECTRONICS, N.V., NETHERLANDS Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:TIOGA TECHNOLOGIES, INC.;REEL/FRAME:017613/0052 Effective date: 20050422 |
|
AS | Assignment |
Owner name: STMICROELECTRONICS, N.V., SWITZERLAND Free format text: CORRECTIVE ASSIGNMENT TO CORRECT THE ASSIGNEE'S COUNTRY PREVIOUSLY RECORDED ON REEL 017613 FRAME 0052;ASSIGNOR:TIOGA TECHNOLOGIES, INC.;REEL/FRAME:019465/0355 Effective date: 20050422 |
|
FEPP | Fee payment procedure |
Free format text: PAYOR NUMBER ASSIGNED (ORIGINAL EVENT CODE: ASPN); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY |
|
FPAY | Fee payment |
Year of fee payment: 8 |
|
FPAY | Fee payment |
Year of fee payment: 12 |