Photoelectric leak current compensating circuit and optical...

Details Photoelectric leak current compensating circuit and optical... Photoelectric leak current compensating circuit and optical...

2006-06-13

2006-06-13

Tra, Quan (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Gating

Utilizing three or more electrode solid-state device

C327S478000

Reexamination Certificate

active

07061303

ABSTRACT:
When a current mirror circuit is composed of transistors that inevitably form a parasitic photodiode between an epitaxial layer and a substrate layer because of structure of an integrated circuit, a photocurrent increases in proportional to an area of the epitaxial layer. Thus, the area of the epitaxial layer is adjusted in accordance with a current ratio of the current mirror, so as to allow the photocurrent to affect equally on both input and output sides of the current mirror circuit, i.e., so as to cancel the photocurrent. With this, in a current mirror circuit provided in an integrated circuit, it is possible to eliminate the influence of the photocurrent, without considerably increasing an element area or taking special measures to shield light.

REFERENCES:
patent: 5003198 (1991-03-01), Bell
patent: 5140181 (1992-08-01), Yoshino
patent: 3-262153 (1991-11-01), None
patent: 3-292775 (1991-12-01), None
patent: 6-45536 (1994-02-01), None

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