Patent ID: 7856048

Claim:
A method of autocalibrating a transceiver, comprising: upconverting a bandpass input signal by mixing the bandpass input signal with a first local oscillator signal to form an initial transmitter signal; looping back the initial transmitter signal to a receiver; bypassing one of an inphase path and a quadrature path of the receiver; downconverting the initial transmitter signal with a second local oscillator signal having a frequency that is different from the first local oscillator to form an intermediate frequency signal; adjusting at least one of a gain and a phase of a transmitter based on a transmitter image sideband of the intermediate frequency signal to generate a calibrated transmitter signal having minimized transmitter image sideband; injecting a test signal from at least one of the calibrated transmitter signal and a bandpass signal source into a complex receiver; downconverting the test signal in a complex receiver to form a complex baseband signal by using the test signal with the first local oscillator; and adjusting at least one of a gain and a phase of the complex receiver based on a receiver image sideband of the complex baseband signal to generate a calibrated receiver signal having minimized receiver image sideband.