Mixer circuit and sending circuit and quasi-millimeter wave and millimeter wave communication terminal using the same

摘要

PROBLEM TO BE SOLVED: To provide a semiconductor integrated circuit incorporating a mixer circuit which operates at a low voltage and is capable of suppressing high-order harmonic waves of a local oscillation frequency signal.;SOLUTION: The mixer circuit has a transconductance amplifier, a transformer, an impedance element, and a multiplier. The transconductance amplifier and the transformer are connected, the transformer and the impedance element are connected, and the impedance element and the multiplier are connected. The transformer, the multiplier and the impedance element are connected in such a way that impedance in viewing the side of the transconductance amplifier from the multiplier becomes high impedance at a frequency being equal to or higher than the double frequency of a local oscillator signal. The transconductance amplifier and the multiplier are each comprised of single-stage vertically stacked transistors.;COPYRIGHT: (C)2011,JPO&INPIT