WO2008021705A3 - Linearised transmitter and method of operation for use in wireless communications - Google Patents

Linearised transmitter and method of operation for use in wireless communications Download PDF

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Publication number
WO2008021705A3
WO2008021705A3 PCT/US2007/074700 US2007074700W WO2008021705A3 WO 2008021705 A3 WO2008021705 A3 WO 2008021705A3 US 2007074700 W US2007074700 W US 2007074700W WO 2008021705 A3 WO2008021705 A3 WO 2008021705A3
Authority
WO
WIPO (PCT)
Prior art keywords
transmitter
forward path
power amplifier
output power
power level
Prior art date
Application number
PCT/US2007/074700
Other languages
French (fr)
Other versions
WO2008021705A2 (en
Inventor
Ib Fordsmand Pedersen
Hans Blomberg
Niels Svenningsen
Original Assignee
Motorola Inc
Ib Fordsmand Pedersen
Hans Blomberg
Niels Svenningsen
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Motorola Inc, Ib Fordsmand Pedersen, Hans Blomberg, Niels Svenningsen filed Critical Motorola Inc
Publication of WO2008021705A2 publication Critical patent/WO2008021705A2/en
Publication of WO2008021705A3 publication Critical patent/WO2008021705A3/en

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/02—Transmitters
    • H04B1/04—Circuits
    • H04B1/0475—Circuits with means for limiting noise, interference or distortion
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
    • H03F1/32—Modifications of amplifiers to reduce non-linear distortion
    • H03F1/3241—Modifications of amplifiers to reduce non-linear distortion using predistortion circuits
    • H03F1/3294—Acting on the real and imaginary components of the input signal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
    • H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
    • H04L27/36—Modulator circuits; Transmitter circuits
    • H04L27/362—Modulation using more than one carrier, e.g. with quadrature carriers, separately amplitude modulated
    • H04L27/364—Arrangements for overcoming imperfections in the modulator, e.g. quadrature error or unbalanced I and Q levels

Abstract

An RF (radio frequency) transmitter (100) includes: a forward path (102); an RF power amplifier (126); a feedback path (104), coupled from the power amplifier to the forward path to form a linearising loop; an RF power meter (135) for measuring an output power level of an RF signal produced by the power amplifier and for providing a signal indicating the output power level and a processor (101) for applying periodically to the forward path in a training mode of the transmitter a training signal including an I component including a first ramped waveform portion (405) and a Q component including a second ramped waveform portion (411), and for sampling the signal indicating output power level to find minima corresponding to optimal positions on the first and second ramped waveform portions and for issuing correction signals indicating corresponding DC offset adjustment levels to be applied in an operational mode.
PCT/US2007/074700 2006-08-11 2007-07-30 Linearised transmitter and method of operation for use in wireless communications WO2008021705A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0615955.2 2006-08-11
GB0615955A GB2442775B (en) 2006-08-11 2006-08-11 Linearised transmitter and method of operation for use in wireless communications

Publications (2)

Publication Number Publication Date
WO2008021705A2 WO2008021705A2 (en) 2008-02-21
WO2008021705A3 true WO2008021705A3 (en) 2008-11-06

Family

ID=37056180

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2007/074700 WO2008021705A2 (en) 2006-08-11 2007-07-30 Linearised transmitter and method of operation for use in wireless communications

Country Status (2)

Country Link
GB (1) GB2442775B (en)
WO (1) WO2008021705A2 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107809276B (en) * 2017-10-10 2020-02-07 中国电子科技集团公司第五十四研究所 Miniaturized satellite data transmission equipment

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4591800A (en) * 1984-10-01 1986-05-27 Motorola, Inc. Linear power amplifier feedback improvement
US6169886B1 (en) * 1998-11-02 2001-01-02 Motorola, Inc. Power amplifier control according to a delayed waveform suitable for use in a communication device
US7103329B1 (en) * 2001-10-25 2006-09-05 Rockwell Collins, Inc. Adaptive feedback channel for radio frequency power amplifiers
US7394311B2 (en) * 2005-02-18 2008-07-01 Samsung Electronics Co., Ltd. Apparatus and method for reduced sample rate class S RF power amplifier

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0598585B1 (en) * 1992-11-16 1999-03-31 Linear Modulation Technology Ltd Automatic calibration of the quadrature balance within a cartesian amplifier
GB2293935B (en) * 1994-10-03 1999-07-14 Linear Modulation Tech Automatic calibration of carrier suppression and loop phase in a cartesian amplifier
WO1998000908A1 (en) * 1996-06-28 1998-01-08 Philips Electronics N.V. Circuit arrangement comprising a cartesian amplifier
GB2329085B (en) * 1997-09-09 2002-06-12 Gec Marconi Comm Ltd RF transmitter
US7133644B2 (en) * 2003-06-06 2006-11-07 Interdigital Technology Corporation Digital baseband system and process for compensating for analog radio transmitter impairments
GB2408860B (en) * 2003-12-04 2006-12-20 Motorola Inc Wireless communication unit, linearised transmitter circuit and method of linearising therein

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4591800A (en) * 1984-10-01 1986-05-27 Motorola, Inc. Linear power amplifier feedback improvement
US6169886B1 (en) * 1998-11-02 2001-01-02 Motorola, Inc. Power amplifier control according to a delayed waveform suitable for use in a communication device
US7103329B1 (en) * 2001-10-25 2006-09-05 Rockwell Collins, Inc. Adaptive feedback channel for radio frequency power amplifiers
US7394311B2 (en) * 2005-02-18 2008-07-01 Samsung Electronics Co., Ltd. Apparatus and method for reduced sample rate class S RF power amplifier

Also Published As

Publication number Publication date
GB2442775A (en) 2008-04-16
WO2008021705A2 (en) 2008-02-21
GB0615955D0 (en) 2006-09-20
GB2442775B (en) 2009-04-29

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