Patent ID: 6560449
Filing Date: 2003-05-06
Classification: H04L

Abstract:
A communications receiver comprising:a carrier signal source; a first demodulator having a first input terminal coupled to an output terminal of the carrier signal source; a second demodulator having a first input terminal coupled to an output terminal of the carrier signal source; a local oscillator (LO) signal source; a quadrature phase shifter having an LO input terminal coupled to the LO signal source, an in-phase (I) output terminal coupled to a second input terminal of the first demodulator, and a quadrature (Q) output terminal coupled to a second input terminal of the second demodulator; and an image/signal ratio detector having a first input terminal coupled to an output terminal of the first demodulator, a second input terminal coupled to an output terminal of the second demodulator, and an output terminal coupled to the quadrature phase shifter for adjusting the I output of the phase shifter and the Q output of the phase shifter thereby to adjust the image response of the communications receiver.