LED with controlled capacitive discharge for photo sensing

Details LED with controlled capacitive discharge for photo sensing LED with controlled capacitive discharge for photo sensing

2005-03-22

2005-03-22

Lee, Wilson (Department: 2821)

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

C250S2140RC

Reexamination Certificate

active

06870148

ABSTRACT:
A method and apparatus determining an intensity of light flux. First, a photodiode or LED is charged by reverse-biasing to a fixed voltage. The fixed voltage is a sum of a threshold voltage and a predetermined offset voltage. Then, a time to discharge the photodiode to the threshold voltage by a photo current is measured to determine an intensity of light producing the photocurrent.

REFERENCES:
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patent: 6344641 (2002-02-01), Blalock et al.
patent: 6396614 (2002-05-01), Yoshizawa
patent: 6414776 (2002-07-01), Omata
patent: 6664744 (2003-12-01), Dietz
Mims, “Siliconnections: Coming of Age in the Electronic Era,” 139-149, McGraw-Hill, New York, NY, 1986.

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