Mixer circuit, semiconductor apparatus including the same, communication device including the same, and electronic device including the same

Abstract

A mixer circuit 1 is a mixer circuit including a pair of differential transistors which receives an input signal IN1-IN2; and a serial resonance circuit 2 connected between collectors of transistors Q1 and Q2 of the pair of differential transistors, the mixer circuit mixing the input signal IN1-IN2 and a local signal LO1-LO2, and outputting the mixed signal.

Description

technical field [0001] The present invention relates to a frequency mixing circuit, a semiconductor device, a communication device, and electronic equipment including the frequency mixing circuit. Background technique [0002] figure 2 Indicates an existing mixer circuit. [0003] input signal IN 1 Input Transistor Q 1 The base of the inverting input signal (inverting input signal) IN 2 Input Transistor Q 2 base. [0004] Local oscillator signal LO 1 Input Transistor Q 3 base of the transistor Q 6 base, inverting the local oscillator signal LO 2 Input Transistor Q 4 base of the transistor Q 5 base. [0005] Transistor Q 1 emitter, transistor Q 2 emitter with a common current source I 0 connected to the input of the current source I 0 The output terminal is electrically grounded. [0006] Transistor Q 1 The collector of the transistor Q 3 emitter as well as the transistor Q 4 The emitter connection of the transistor Q 2 The collector of the transistor Q ...

AI Technical Summary

Problems solved by technology

In the case where the above-mentioned unwanted signal overlaps at a high level with the same frequency as the TV broadcast signal, the reception performance deteriorates significantly compared to the case where the above-mentioned unwanted signal appears at a different frequency

[0036] In addition, when receiving 650MHz digital TV broadcasting, since the 1950MHz W CDMA interference wave satisfies f U = 3f D , therefore, resulting in audio-visual impairment of single-segment broadcasting

Images