Current source circuit

Details Current source circuit Current source circuit

2008-01-30

2010-10-05

Donovan, Lincoln (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Specific identifiable device, circuit, or system

With specific source of supply or bias voltage

Reexamination Certificate

active

07808309

ABSTRACT:
A current source circuit is provided. The circuit includes a first transistor and at least one second transistor. A first source/drain terminal of the first transistor is coupled to a bias voltage. A second source/drain terminal of the first transistor is used to receive a current signal, and the second source/drain terminal of the first transistor is coupled to a gate terminal of the first transistor. A first source/drain terminal of the second transistor is grounded. A second source/drain terminal of the second transistor is coupled to a voltage source and outputs a bias current. A gate terminal of the second transistor is coupled to the gate terminal of the first transistor.

REFERENCES:
patent: 4642552 (1987-02-01), Suzuki et al.
patent: 6801186 (2004-10-01), Han et al.
patent: 6815941 (2004-11-01), Butler
patent: 2005/0168265 (2005-08-01), Lee et al.
patent: 1267718 (2006-12-01), None
“Office Action of Taiwan Counterpart Application”, issued on May 18, 2010. p1-p5.

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