Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – With specific source of supply or bias voltage
Reexamination Certificate
2005-03-08
2005-03-08
Wells, Kenneth B. (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
With specific source of supply or bias voltage
C327S091000, C327S096000, C327S337000
Reexamination Certificate
active
06864740
ABSTRACT:
A system for measuring output voltage from a photodetector. The system includes a photodetector that generates a photodetector output signal, a ramp generator that generates a ramp signal and a comparator that outputs a signal level based on which of the two signals is larger. The voltage level of the output of the phototransistor determines how long it will take for the ramp voltage to catch up and cross over the phototransistor voltage. The crossover time determines the width of an output signal and is directly proportional to the voltage level. A microcontroller can then determine the pulse width by multiple samplings and therefore determine photodetector voltage.
REFERENCES:
patent: 3816724 (1974-06-01), Wentworth
patent: 4524351 (1985-06-01), Kimura et al.
patent: 4535300 (1985-08-01), Streckmann
patent: 4788456 (1988-11-01), Urman et al.
patent: 5168180 (1992-12-01), Bayer et al.
Intel Corporation
Marger & Johnson & McCollom, P.C.
Wells Kenneth B.
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