Mixer gain calibration method and apparatus

Details Mixer gain calibration method and apparatus Mixer gain calibration method and apparatus

2006-01-03

2006-01-03

Urban, Edward F. (Department: 2685)

Telecommunications

Receiver or analog modulated signal frequency converter

Local control of receiver operation

C455S311000, C455S333000, C455S326000

Reexamination Certificate

active

06983135

ABSTRACT:
A gain calibration circuit for a radio frequency mixer in a wireless transceiver includes a reference signal generator that generates a reference signal. A comparator receives the reference signal and a second signal that is proportional to current flowing through the transmitter mixer and generates a difference signal. An adjustment circuit adjusts a transconductance gain of the mixer based on the difference signal. The adjustment circuit includes a plurality of binary weighted transconductance cells. The transconductance gain is calibrated during idle time between data packets or after power on, hardware reset, or software reset.

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