Patent ID: 6140849
Filing Date: 2000-10-31
Classification: H03D

Abstract:
A linearized double-balanced active mixer circuit for mixing an input intermediate frequency (IF) signal and an input local oscillator (LO) signal and producing an output radio frequency (RF) signal comprising:a first pair of input terminals for receiving a differential first and second IF input signal;a second pair of input terminals for receiving a differential first and second LO input signal;a pair of output terminals for providing a first and second RF output signal;a first linearized balanced active mixer circuit having an IF input connected to the first IF signal input terminal of the linearized double-balanced active mixer circuit, a differential first and second LO input connected to the differential first and second LO signal input terminals of the linearized double-balanced active mixer circuit, a differential first and second RF output, and a feedback input;a second linearized balanced active mixer circuit having an IF input connected to the second IF signal input terminal of the linearized double-balanced active mixer circuit, a differential first and second LO input connected to the differential first and second LO signal input terminals of the linearized double-balanced active mixer circuit, a differential first and second RF output, and a feedback input; anda signal combiner circuit having a first pair of differential first and second RF inputs connected to the differential first and second RF outputs of the first linearized balanced active mixer circuit, a second pair of differential third and fourth RF inputs connected to the differential first and second RF outputs of the second linearized balanced active mixer circuit, a first feedback output connected to the feedback input of the first linearized balanced active mixer circuit, a second feedback output connected to the feedback input of the second linearized balanced active mixer circuit, and a pair of first and second RF outputs connected to the first and second RF output terminals of the linearized double-balanced active mixer circuit.