Constant-current power supply circuit and digital/analog convert

Details Constant-current power supply circuit and digital/analog convert Constant-current power supply circuit and digital/analog convert

1998-10-13

1999-12-28

Wong, Peter S.

Electricity: power supply or regulation systems

Self-regulating

Using a three or more terminal semiconductive device as the...

323314, 327538, 327544, G05F 316, G02B 5128

Patent

active

060086327

ABSTRACT:
A constant-current power supply circuit includes a bias circuit (20); first and second transistors (11 and 12); an output terminal (OUT); a bias voltage defining circuit (30 & 40); and a compensator (50 or 60). The bias circuit (20) generates a first bias voltage (Vb1). The first transistor (11) supplies a first current (I.sub.1) in response to the first bias voltage (Vb1), supplied from the bias circuit (20). The first current is outputted from an output terminal (OUT). The second transistor (12) is connected between the first transistor (11) and the output terminal (OUT) and is operated in response to a second bias voltage (Vb2). The bias voltage defining circuit (30 & 40) defines the second bias voltage (Vb2). The compensator (50 or 60) is connected to the bias defining circuit (30 & 40) to perform temperature compensation.

REFERENCES:
patent: 4492914 (1985-01-01), Hitomi
patent: 5266887 (1993-11-01), Smith
patent: 5510750 (1996-04-01), Cho
patent: 5519309 (1996-05-01), Smith
patent: 5525897 (1996-06-01), Smith
patent: 5559425 (1996-09-01), Allman
patent: 5705921 (1998-01-01), Xu
patent: 5838192 (1998-11-01), Bowers et al.

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