JPS6082821U

JPS6082821U - Differential amplifier bias circuit

Info

Publication number: JPS6082821U
Application number: JP17404783U
Authority: JP
Inventors: 和久石黒
Original assignee: 三洋電機株式会社
Priority date: 1983-11-09
Filing date: 1983-11-09
Publication date: 1985-06-08
Also published as: JPH0115224Y2

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Brief explanation of drawings]

第１図は、従来の差動増幅器のバイアス回路を示す回路
図、第２図は本考案の一実施例を示す回路図、第３図は
その一部の別の実施例を示す回路図、及び第４図は第３
図の更に別の実施例を示す回路図である。主な図番の説明、２１−・・差動増幅器、２４・・・定
電流トランジスタ、２５・・・第１トランジスタ、３章
、夛夛、１長、３８・・・電流反転回路。FIG. 1 is a circuit diagram showing a bias circuit of a conventional differential amplifier, FIG. 2 is a circuit diagram showing one embodiment of the present invention, and FIG. 3 is a circuit diagram showing another embodiment of a part thereof. and Figure 4 is the third
FIG. 7 is a circuit diagram showing still another embodiment of the figure. Explanation of main figure numbers, 21--Differential amplifier, 24--Constant current transistor, 25--First transistor, Chapter 3, Group, 1 length, 38--Current inversion circuit.

Claims

[Scope of utility model registration request]

Bias for supplying bias current to a differential amplifier comprising first and second amplification transistors whose emitters are commonly connected, and a constant current transistor connected to the common emitters of the first and second amplification transistors. The circuit includes a transistor whose base and emitter are commonly connected to the constant current transistor, a current source that supplies a collector current of the transistor, and a difference current between the collector current of the transistor and the output current of the current source. a first current inverting circuit that inverts the output current of the first current inverting circuit; a second current inverting circuit that inverts the output current of the first current inverting circuit to generate a base current of the constant current transistor; a third current inversion circuit that inverts and generates a base current of the first amplification transistor; and a fourth current that inverts the output current of the first current inversion circuit and generates a base current of the second amplification transistor. and an inversion circuit, and by setting the inversion ratios of the first to fourth current inversion circuits to predetermined values, the base currents of the first and second amplification transistors are made to be equal to the base current of the constant current transistor. A differential amplifier bias circuit characterized by: