Patent ID: 7181205

Claim:
A transceiver providing self-calibration and comprising: a) transmit and receive circuitry adapted to receive control signals for adjusting transmit and receive amplitude and phase errors, the transmit and receive circuitry comprising: a modulator adapted to receive baseband transmit signals and provide modulated transmit signals; and a demodulator adapted to demodulate receive signals and provide baseband receive signals; b) loopback circuitry adapted to connect the output of the modulator to the input of the demodulator during calibration such that the receive signals are the modulated signals from the modulator; and c) calibration circuitry adapted to provide test signals as the baseband transmit signals during calibration and to adjust the control signals based on a series of measurements of the baseband receive signals, wherein the series of measurements includes at least one measurement to determine a combined effect of the phase offset of the loopback circuitry and a phase difference between the modulated transmit signals and the receive signals.