Patent ID: 6393267
Filing Date: 2002-05-21
Classification: H03D

Abstract:
A lossless feedback 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 pair of IF input terminals for receiving differential first and second IF input signals, including a first IF signal input terminal for receiving the first IF input signal and a second IF signal input terminal for receiving the second IF input signal; a pair of LO input terminals for receiving differential first and second LO input signals; an RF output terminal for providing an RF output signal; a first lossless feedback balanced active mixer circuit having an IF signal input connected to the first IF signal input terminal of the lossless feedback double-balanced active mixer circuit, a first and second differential LO signal inputs connected to the pair of LO input terminals of the lossless feedback double-balanced active mixer circuit, and an RF signal output connected to the RF output terminal of the lossless feedback double-balanced active mixer circuit; and a second lossless feedback balanced active mixer circuit having an IF signal input connected to the second IF signal input terminal of the lossless feedback double-balanced active mixer circuit, a first and second differential LO signal inputs connected to the pair of LO input terminals of the lossless feedback double-balanced active mixer circuit, and an RF signal output connected to the RF output terminal of the lossless feedback double-balanced active mixer circuit.