Patent ID: 7418244

Claim:
A radio transmission power control circuit for controlling transmission power of a half-duplex radio transceiver, comprising: a radio frequency (rf) downconverter that produces a downconverter output having a frequency equal to the frequency difference between a first downconverter input based on a transmitted signal of a radio transmitter of the half-duplex radio transceiver and a second downconverter input based on a local oscillator signal; a receiver baseband circuit of the half-duplex radio transceiver that alternately transmits and receives radio signals, the receiver baseband circuit operating while the half-duplex radio transceiver is receiving, to process received radio signals, and while the half-duplex radio transceiver is transmitting, to process the downconverter output to produce a power signal representative of the power of the transmitted signal; and a feedback control circuit that produces a transmitter gain control signal to control the transmitted signal power so as to minimize the difference between the power signal and a power reference signal representative of the desired power of the transmitted signal.