Patent ID: 9178627
Filing Date: 2015-11-03
Classification: H03F,H04B

Abstract:
1. Circuitry adapted to operate in one of a test mode and a normal operating mode, and comprising: an IQ to radio frequency modulator adapted to, during the test mode, modulate a quadrature radio frequency carrier signal using a quadrature test signal; a radio frequency to IQ down-converter adapted to, during the test mode, down-convert a down-converter radio frequency input signal to provide a quadrature down-converter output signal using the quadrature radio frequency carrier signal, such that the down-converter radio frequency input signal is based on the quadrature test signal and a complex gain of a transmit path; and a digital frequency converter adapted to, during the test mode, frequency convert the quadrature down-converter output signal to provide an averaged frequency converter output signal, which is a quadrature direct current signal that is representative of an amplitude and phase of the quadrature test signal and the complex gain of the transmit path, such that the quadrature down-converter output signal is synchronized to the quadrature test signal.