Patent ID: 7139546
Filing Date: 2006-11-21
Classification: H04B

Abstract:
1. A direct conversion receiver circuit comprising the following: a down-converting mixer that is configured to down-convert a received modulated signal to thereby generate a baseband signal; a low pass filter comprising a resister-capacitor circuit having at least one pole that is coupled to the down-converting mixer so as to filter high frequency components of the down-converted signal to thereby generate a filtered down-converted signal; an up-converting mixer that is coupled to the low pass filter so as to receive and up-convert the filtered down-converted signal, wherein there are no active components that operate on the down-converted baseband signal prior to being up-converted; an amplifier configured to receive and amplify the up-converted signal; and an up-converting local oscillator that is configured to generate a first up-conversion control signal and a second up-conversion control signal that represents a binary complement of the first up-conversion control signal, wherein the up-converting mixer comprises the following: