Patent ID: 8634793

Claim:
A radio frequency receiver on an integrated circuit (RFIC), the RFIC comprising: a local oscillator configured to provide a local oscillatory signal; a mixer; a low noise amplifier (LNA); a resonant circuit; an amplitude modulator; wherein when the RFIC is configured in a first mode, 1) the LNA amplifies received RF signals which are then passed to the resonant circuit, 2) then the resonant circuit bandpass filters the amplified received RF signals which are then passed to the mixer, and wherein when the RFIC is configured in a second mode, the resonant circuit and the LNA generate an oscillatory signal and the amplitude modulator [generate and pass] modulates the oscillatory signal to provide predetermined amplitude modulated (AM) RF signals to the mixer, the mixer coupled to the amplitude modulator and to the local oscillator for downconverting the predetermined AM RF signals to produce intermediate frequency (IF) signals having frequencies within an IF passband; and a calibration circuit coupled to the mixer, the calibration circuit configured to receive the IF signal from the mixer when the RFIC is in the second mode, to detect second order modulation (IM2) products in the IF signal, to generate a bias signal, to apply the bias signal to the mixer and to adjust the bias signal in a sense determined by the detected IM2 products to reduce the IM2 products.