Patent ID: 7522658

Claim:
A radio frequency (RF) receiver, comprises: an analog filter characterized by defined poles and zeroes that is operable to receive and filter an ingoing analog signal and to produce an ingoing filtered signal; analog-to-digital conversion (ADC) circuitry operable to produce an ingoing digital signal based upon the ingoing filtered signal; digital down conversion circuitry for reducing a sample rate of the digitized ingoing filtered signal and for translating the ingoing filtered signal to base band frequency to produce an ingoing base band frequency signal; a narrow band digital channel select filter operable to pass components of the ingoing base band frequency signal within a defined channel and to reject interferers and noise outside of the defined channel to produce an ingoing digital signal within a frequency band of interest; a digital equalizer communicatively coupled to receive the ingoing digital signal within the frequency band of interest, the digital equalizer comprising a plurality of second order Infinite Impulse Response (IIR) filters that operate upon the ingoing digital signal within the frequency band of interest to compensate for distortion introduced into the signal by any one of the narrow band digital channel select filter or the analog filter to produce a compensated ingoing digital signal; a Coordinate Rotation Digital Computer (CORDIC) that is operable to extract and produce phase and amplitude information from the compensated ingoing digital signal, and a demodulator operable to demodulate and extract data from the phase and amplitude information; wherein filter coefficients of the plurality of second order IIR filters are based upon optimized values to modify a magnitude response produced from at least one of the analog filter and the digital channel select filter; and wherein the filter coefficients are selected to counteract a group delay response.