Patent ID: 6862438

Claim:
A radio receiver formed in an integrated circuit, comprising: a receiver and low noise amplifier circuit (Rx/LNA) coupled to receive an RF signal; a mixer coupled to receive an amplified RF signal of the Rx/LNA, the mixer for down converting the received amplified RF signal; at least one programmable gain amplifier (PGA) for providing a coarse incremental gain step; and at least one PGA for providing a fine incremental gain step, comprising: an operational amplifier (Op Amp); a first group of MOSFETs coupled in parallel in a feedback loop of the Op Amp between the Op Amp's output and negative input; and a second group of MOSFETs coupled to the negative input of the Op Amp wherein the MOSFETs of the first and second groups are matched and further wherein the number of selectable transistors in the second group of MOSFETs is chosen so that increments of gain in terms of dB may be achieved from zero dB to a dB value that is equal to or less than a gain step size produced by the at least one PGA for providing a coarse incremental step.