Patent ID: 8085868
Filing Date: 2011-12-27
Classification: H03F

Abstract:
1. A communication circuit comprising: a summing circuit adapted to supply a first sum containing an in-phase signal and a quadrature-phase signal and a second sum containing an inverted in-phase signal and an inverted quadrature-phase signal; a plurality of differential amplifiers, wherein each of the plurality of differential amplifiers contains a plurality of inputs and outputs adapted to receive the first and second sums, and wherein each of the plurality of differential amplifiers amplifies a desired frequency band of a plurality of frequency bands; a plurality of feedback circuits, wherein each of the plurality of feedback circuits contains a first element connected between an input and an output of one of the plurality of differential amplifiers; and a bandpass filter connected with the output of each of the plurality of differential amplifiers, wherein the bandpass filter passes the desired frequency band.