Signal conditioning circuitry

Details Signal conditioning circuitry Signal conditioning circuitry

2005-09-22

2008-10-28

Pyo, Kevin (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

C250S2140RC, C345S166000

Reexamination Certificate

active

07442915

ABSTRACT:
This invention relates to signal conditioning circuitry14afor an optical pointing device, the circuitry comprising: means15afor determining the rate of change of a signal generated on periodic illumination of a photodetector, and outputting a signal representative of said determined rate of change; and means17afor comparing the signal output by said determining means to a reference voltage.

REFERENCES:
patent: 4210775 (1980-07-01), Rodgers et al.
patent: 5644127 (1997-07-01), Ohmae
patent: 5877752 (1999-03-01), Puthuff et al.
patent: 6222182 (2001-04-01), Featherston et al.
patent: 2002/0170399 (2002-11-01), Gass et al.
patent: 2044446 (1980-10-01), None
patent: 57145425 (1982-09-01), None
patent: 04123123 (1992-04-01), None

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