Patent ID: 7515891

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 to produce a down converted signal having quadrature and in-phase components; a programmable gain amplifier (PGA) block for providing coarse and fine incremental gain steps based upon a gain control signal of the down converted signal, wherein the PGA block further includes: an operational amplifier (Op Amp); a first group of MOSFETs coupled in parallel in a feedback loop of the Op Amp between an output and negative input of the Op Amp; 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 a 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 PGA block for providing a coarse incremental step; and gain control logic for generating the gain control signal based upon peak values of quadrature and in-phase down converted signals.