Patent ID: 6977976

Claim:
An apparatus for filtering and amplifying a received signal that includes a desired signal portion embedded in an interfering signal portion comprising: a plurality of sequentially connected complex filter/amplifier stages, each stage having: a complex filter for attenuating an interfering signal portion relative to a desired signal portion of a signal received by the complex filter; a controlled amplifier having set minimum gain K min and maximum gain K max for amplifying the desired signal portion and the interfering signal portion of the signal received from the complex filter; and a control circuit for controlling a gain K of the controlled amplifier in the complex filter/amplifier stage where K min ≦K≦K max such that the controlled amplifier seeks to generate the desired signal of the signal received from the complex filter, the desired signal having a projected amplitude level at the controlled amplifier output, wherein the apparatus provides an output of the last stage of the complex filter/amplifier as the desired signal of the received signal at a predetermined signal level at the apparatus output as a result of a combined gain of the controlled amplifiers of the plurality of the complex filter/amplifier stages.