Patent ID: 7676212
Filing Date: 2010-03-09
Classification: H03D

Abstract:
1. A mixer, comprising: a differential input circuit that is configured to receive an input signal and that comprises: a tank circuit that comprises a tuning capacitor arranged in parallel with an inductor, wherein a resonant frequency of the inductor and tuning capacitor is substantially centered around a predetermined frequency of the input signal, wherein the tank circuit is in communication between a ground and common emitters of the differential amplifier of the differential input circuit, and wherein the tank circuit is configured as a passive current source; and a mixer circuit that communicates with the differential input circuit and that is configured to receive the first and second current signals and a second input signal, and wherein the mixer circuit is configured as a Gilbert cell double-balanced switching mixer for generating a differential mixer output signal as a product of the first and second current signals and the second input signal.