Patent ID: 8213555

Claim:
A receiver comprising: a low noise amplifier, wherein an output of the low noise amplifier is divided into two signal paths from the low noise amplifier; a cosine mixer and a sine mixer, each in its respective signal path, and each mixer having an output; a processor, in circuit with both the cosine mixer and the sine mixer, to determine an amplitude of an offset signal to be applied to the output of each mixer; each signal path comprising: a) a first adder in circuit with the processor, and each first adder disposed at an output of each mixer to receive its own offset component, thereby improving the second order intermodulation distortion performance of its respective mixer; b) a first amplifier in circuit with the first adder to receive an output signal from the first adder and to produce an output signal based thereon, c) a DC offset canceller connected as an outer DC offset compensation loop, one per individual mixer, comprising: i) a second adder in circuit with the first amplifier, ii) an estimator and to add a removal signal to an output of the first amplifier to reduce the DC value of the signal at the output from a second amplifier at the output of the second adder, iii) a second amplifier that receives an output of the second adder; iv) an analog to digital converter coupled to an output of the second amplifier; v) a downsampling reconstructive filter in circuit with the second amplifier, and vi) an inner DC compensation loop comprising: the estimator, in circuit with the first amplifier, to a) estimate a DC value of the output signal of the second amplifier as received from the reconstructive filter and the processor; and b) generate a removal signal based on the DC value of the output signal from the second amplifier, wherein the offset signal is a substantially DC signal, wherein the first and second adders are analog adders, and wherein the first and second amplifiers are analog amplifiers.