Patent ID: 7450919

Claim:
A method of compensating for an I/Q mismatch of a receiver comprising: providing receiver circuitry and associated transmitter circuitry formed on a single substrate; transmitting a transmit signal; receiving the transmit signal at an input of amplifier circuitry coupled to an input of the receiver circuitry due to leakage through the substrate from an output of the transmitter circuitry to the input of the amplifier circuitry; modulating a gain of the amplifier circuitry while receiving the transmit signal such that an output of the amplifier circuitry has a known frequency offset from a carrier frequency of the transmit signal; downconverting the output of the amplifier circuitry using a quadrature local oscillator signal to provide a quadrature output signal; and processing the quadrature output signal to determine an I/Q mismatch of the receiver circuitry based on frequency components of the quadrature output signal corresponding to the known frequency offset.