Mixer having compensation for harmonics of local oscillator signal

摘要

A mixer for a wireless communications system having a differential amplifier that translates an input intermediate frequency voltage signal or an input radio frequency voltage signal to current signals that are supplied to a doubly-balanced switching modulator that develops a differential mixed output radio frequency signal or intermediate frequency signal that is the product of the current signals and a local oscillator signal. Included in the differential amplifier are a first reactance circuit and a second reactance circuit each of which provides a low impedance to ground at the second harmonic of the local oscillator signal and a high impedance at the frequency of the input radio frequency signal or input intermediate frequency signal.