Mixer circuit and variation suppressing method

Abstract

In a mixer circuit that solves the problem of the extreme increase in circuit complexity that accompanies compensating for amplitude errors and phase errors, a voltage current conversion unit () converts an RF signal, which is a voltage signal, to a current signal and supplies the current signal. An RF path selection unit () connects its input terminal to any of its output terminals in accordance with the state of a four-phase clock signal and separately supplies, from its output terminals, a plurality of IF signals obtained by multiplying the RF signal by clock signals in the four-phase clock signal. An IF path selection unit () switches the connection relationship between its input terminals and its output terminals in accordance with a selection signal (S) and supplies the IF signal input to each of its input terminals from its output terminals that are connected to the input terminals.