JPS61107017U

JPS61107017U -

Info

Publication number: JPS61107017U
Application number: JP19344784U
Authority: JP
Priority date: 1984-12-20
Filing date: 1984-12-20
Publication date: 1986-07-07

Description

[Brief explanation of the drawing]

第１図は本考案に係る定電流源回路の一実施例
を示す回路図、第２図は動作を説明する為の図、
第３図は従来の定電流源回路を示す回路図である
。１，２：端子、３，４：バイアス電圧源、５：
電流ミラー回路。 FIG. 1 is a circuit diagram showing an embodiment of the constant current source circuit according to the present invention, FIG. 2 is a diagram for explaining the operation,
FIG. 3 is a circuit diagram showing a conventional constant current source circuit. 1, 2: terminal, 3, 4: bias voltage source, 5:
Current mirror circuit.

Claims

[Claims for Utility Model Registration] (1) First and second transistors, one of which has a large emitter area and the other a small emitter area, each of which has a current source connected to its collector;
A first resistor connected between the emitters of the first and second transistors, a second resistor connected to the emitters of the second transistor, and bases of the first and second transistors. a bias voltage source commonly connected to a bias voltage source, and a collector and an emitter of a third transistor are connected correspondingly to a collector of the first transistor and an emitter of the second transistor to bias the third transistor; A constant current source circuit comprising: means for activating the current source according to the method. (2) Utility model registration claim 1, wherein the current source that supplies a constant current to the bias voltage source forms a current mirror circuit with the current source connected to the collectors of the first and second transistors. Constant current source circuit described in section.