Patent ID: 7391814

Claim:
A gain controller comprising: a first low pass filter configured to generate a filtered in-phase (I) signal; a second low pass filter configured to generate a filtered quadrature (Q) signal; a normalization circuit coupled to outputs of the first and second low pass filters for adjusting the gain of the filtered I and Q signals on a block-by-block basis as a function of averaged combined signal strength measurements of the filtered I and Q signals; a first delay circuit electrically coupled to an output of the first low pass filter for outputting a delayed filtered I signal; a second delay circuit electrically coupled to an output of the second low pass filter for outputting a delayed filtered Q signal; a first multiplier having a first input electrically coupled to an output of the first delay circuit, and a second input electrically coupled to an output of the normalization circuit used to adjust the gain of the delayed filtered I signal, wherein the first multiplier outputs a value substantially equal to the delayed filtered I signal divided by the averaged combined signal strength of the filtered I and Q signals; and a second multiplier having a first input electrically coupled to an output of the second delay circuit, and a second input electrically coupled to an output of the normalization circuit used to adjust the gain of the delayed filtered Q signal, wherein the second multiplier outputs a value substantially equal to the delayed filtered Q signal divided by the averaged combined signal strength of the filtered I and Q signals.