Patent ID: 7085547

Claim:
A mixer circuit, comprising: an oscillator; a first mixer of which high-frequency signal is supplied to one input, and output signal of the oscillator is supplied to the other input; an output terminal to which output from the first mixer is supplied; a second mixer of which the high-frequency signal is supplied to one input thereof; a first oscillator phase shifter which is connected between the other input of the second mixer and the output of the oscillator and serves to shift the phase of output signal of the oscillator by −π/3 radian as against the phase of the other input of the first mixer; a first intermediate frequency phase shifter which is connected between the output of the second mixer and the output terminal and serves to shift the phase of output of the second mixer by −5π/3 radian; a third mixer of which the high-frequency signal is supplied to one input thereof; a second oscillator phase shifter which is connected between the other input of the third mixer and the output of the oscillator and serves to shift the phase of output signal of the oscillator by −2π/3 radian as against the phase of the other input of the first mixer; and a second intermediate frequency phase shifter which is connected between the output of the third mixer and the output terminal and serves to shift the phase of output of the third mixer by −4π/3 radian, wherein each of the other input of the first mixer, the other input of the second mixer, and the other input of the third mixer is provided with a limiter circuit.