Digital to analog converter (DAC) current source arrangement

Details Digital to analog converter (DAC) current source arrangement Digital to analog converter (DAC) current source arrangement

1996-08-08

1997-06-10

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Current driver

327404, H03K 300

Patent

active

056380119

ABSTRACT:
Arrangement for providing improved current source signals in a DAC current source circuit including a current source transistor, an output transistor, and a switching transistor for selectively grounding the source current or directing it through the output transistor. The DAC current source circuit includes a high gain double cascode device for electrically isolating the current source and output transistors from the switching transistor. The isolation device may include one, two or more transistors in series. The arrangement further includes a matching circuit at the input of the DAC current source circuit.

REFERENCES:
patent: 4831282 (1989-05-01), Colles
patent: 5001484 (1991-03-01), Weiss
patent: 5012178 (1991-04-01), Weiss et al.
patent: 5148065 (1992-09-01), Krenik et al.
patent: 5155384 (1992-10-01), Duetz
patent: 5198782 (1993-03-01), Scott
patent: 5239210 (1993-08-01), Scott

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