Light monitor, electronic circuit incorporating a light...

Details Light monitor, electronic circuit incorporating a light... Light monitor, electronic circuit incorporating a light...

2007-09-04

2007-09-04

Luu, Thanh X. (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

Reexamination Certificate

active

11154222

ABSTRACT:
A light monitor includes a single semiconductor substrate. A light to frequency (LTF) converter is on the single semiconductor substrate, a threshold comparator is on the single semiconductor substrate and coupled to an output of the light to frequency converter, and a light intensity calculator is on the single semiconductor substrate and coupled to an output of the threshold comparator.

REFERENCES:
patent: 4985632 (1991-01-01), Bianco et al.
patent: 5408293 (1995-04-01), Sakamoto et al.
patent: 5585623 (1996-12-01), Ohtomo et al.
patent: 6011985 (2000-01-01), Athan et al.
patent: 6117643 (2000-09-01), Simpson et al.
patent: 6144024 (2000-11-01), Rushing
patent: 6295413 (2001-09-01), Ogasawara
patent: WO96/10165 (1996-04-01), None
patent: WO03/021939 (2003-03-01), None

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