Photodetection system and circuit for amplification

Details Photodetection system and circuit for amplification Photodetection system and circuit for amplification

2005-01-04

2005-01-04

Pyo, Kevin (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

C250S2140LA, C250S231130, C330S308000

Reexamination Certificate

active

06838654

ABSTRACT:
A first device comprising a first current mirror is used to amplify the output of a first photodetector. A second device comprising a current mirror arrangement is employed to amplify the output of a second photodetector. The outputs of the two devices are then compared to provide a signal useful for many applications, including that for determining the position of a rotating member or of a member in relative motion to another member. Preferably, no feedback action is used for the amplification of the output of at least one of the photodetectors.

REFERENCES:
patent: 4654525 (1987-03-01), Ebina et al.
patent: 5981936 (1999-11-01), Fujiie
patent: 5982206 (1999-11-01), Tachio et al.
patent: 6476954 (2002-11-01), Nishizono
“Notification of Transmittal of the International Search Report or the Declaration”, corresponding PCT application No. PCT/US03/02033, International Searching Authority, European Patent Office, Jan. 24, 2003, 6 pages.
Sedra, Adel S., Smith, Kenneth C.; “Microelectronic Circuits” Fourth Edition, Oxford University Press, 1998, pp. 281-282, pp. 402-408.

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