Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Reexamination Certificate
2007-07-24
2007-07-24
Epps, Georgia (Department: 2878)
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
C250S559290, C250S221000, C250S205000, C345S157000, C348S300000
Reexamination Certificate
active
11223389
ABSTRACT:
A signal processor and processing method are provided for measuring current received from a photo-detector. Generally, the processor includes a transimpedance amplifier (TIA) to integrate a current received from a photo-detector in the optical navigation system to generate a voltage signal having a slope that is proportional to the received current, and a comparator having a first input coupled to an output of the TIA to receive the voltage signal, and a second, inverting, input coupled to a threshold voltage. The comparator is configured to compare the voltage signal to the threshold voltage and to generate an output pulse having a predetermined voltage and a duration or width that is a function of the received current.
REFERENCES:
patent: 4740675 (1988-04-01), Brosnan et al.
patent: 6031218 (2000-02-01), Piot et al.
patent: 6137566 (2000-10-01), Leonard et al.
patent: 6424407 (2002-07-01), Kinrot et al.
patent: 2005/0134556 (2005-06-01), VanWiggeren et al.
Bui-Pho Pascal M.
Epps Georgia
Nuttle William E.
Silicon Light Machines Corporation
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