A single integrated circuit for an RF/ID transponder includes a nonvolatile memory portion, which is ideally a ferroelectric memory, digital logic, digital interface circuitry, and differential analog driver circuitry for driving an antenna that is contained within the RF/ID transponder, but external...http://www.google.de/patents/US5926110?utm_source=gb-gplus-sharePatent US5926110 - Programmable output devices for controlling signal levels in an RF/ID transponder
