Patent ID: 7447490

Claim:
An apparatus for calibrating gain of a radio receiver (“Rx”) path in a radio frequency (“RF”) integrated circuit comprising: a thermal noise generator configured to generate thermal noise as a calibrating signal into an input of said Rx path; and a calibrator configured to: measure an output signal from an output of said Rx path, and adjust a gain of said Rx path based on said thermal noise; wherein said calibrator comprises: a gain evaluator configured to determine a gain differential between a calculated gain that is based on said output signal and an expected gain, wherein said gain evaluator includes an output quantifier configured to quantify an output noise power signal as said output signal to determine a measured output noise power signal value and a parametric generator configured to provide a plurality of parameters associated with said Rx path, at least one parameter being an input noise power signal value representative of said thermal noise, wherein said gain evaluator determines said calculated gain as a function of said measured output noise power signal value and said input noise power signal value; and a gain adjuster configured to adjust said gain of said Rx path by an amount equivalent to said gain differential, said Rx path including an adjustable amplifier.