Method and means for processing an analog signal from a diode ar

Details Method and means for processing an analog signal from a diode ar Method and means for processing an analog signal from a diode ar

1989-11-22

1991-02-05

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

307311, H01J 4014

Patent

active

049907654

ABSTRACT:
A method and means for the electronic processing of an analog signal generated in a series addressed diode array to produce a digital signal indicative of the illumination of the photodiodes in the array is disclosed. A voltage ramp is applied to the array and the resulting current steps converted to a voltage signal. The voltage signal is differentiated and the resulting pulses are digitized to provide the illumination state of the photodiodes in the array. Alternately, the voltage signal is integrated in a series of windows. The results of each previous integration is substrated from the most current integration, producing a series of pulses that are digitized to provide the illumination state of the array. The processing may be synchronized by either dividing the sweep interval into evenly spaced intervals, by differentiating the voltage signal and detecting the derivative exceeding a threshold, or differentiating the voltage signal twice and detecting zero-crossings in the resulting signal. The voltage ramp may be made to increase in slope with time to help ensure that the addressing diodes begin conducting at equal time intervals.

REFERENCES:
patent: 3432670 (1969-03-01), Dym et al.
patent: 3448275 (1969-06-01), Hall et al.
patent: 3984677 (1976-10-01), Hosoe et al.
patent: 4565928 (1986-01-01), Yamamoto et al.
patent: 4785191 (1988-11-01), Ondris et al.
Horton et al.; "The Scanistor--A Solid-State Image Scanner;" Proceedings of the IEEE; Dec. 1964; pp. 1513-1528.

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