Regulated current mirror

Details Regulated current mirror Regulated current mirror

2005-03-04

2008-10-21

Epps, Georgia Y. (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

C250S2140RC

Reexamination Certificate

active

07439480

ABSTRACT:
Systems and methods for regulating a current mirror. A current mirror includes mirror circuits that each include a transistor or a transistor network. A mirror circuit in the current mirror is used by a detector of an optical receiver to draw current in response to an incident optical signal on the photodiode. The transistor in the current mirror is connected with a regulating amplifier that drives a gate of the transistor. The regulating amplifier uses the drain voltage of the transistor as an input such that the amplifier's output drives the gate such that the drain voltage substantially matches a reference voltage that is also an input to the regulating amplifier. The regulating amplifier can be integrated with the current mirror and eliminates the need for an external capacitor to reduce the effects of noise on current drawn by the detector.

REFERENCES:
patent: 4446443 (1984-05-01), Johnson et al.
patent: 6392215 (2002-05-01), Baumgartner et al.
patent: 6635857 (2003-10-01), Kindt
patent: 6885958 (2005-04-01), Yaklin
patent: 2003/0098407 (2003-05-01), Ames et al.
patent: 2003/0107439 (2003-06-01), Callahan, Jr.
U.S. Appl. No. 11/072,179, filed Mar. 4, 2005 entitled “Continuous Temperature Compensation for a Laser Modulation Current.”

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