Method for reading a light-sensitive element constituted by a ph

Details Method for reading a light-sensitive element constituted by a ph Method for reading a light-sensitive element constituted by a ph

1987-01-16

1989-01-10

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

250578, 35821328, H01J 4014, H04N 314

Patent

active

047975466

ABSTRACT:
A method for reading a photosensitive element having a photodiode and a capacitor as applicable in particular to reading a low-level analog signals consists in introducing a biasing charge background, for example by means of calibrated uniform illumination prior to each read operation in order to cause forward biasing of the photodiode substantially beyond its knee voltage at the time of application of a control read pulse which reliably restores the voltage at the photodiode terminals to the knee voltage value, the current during the read operation being such that all the charges are then reliably transmitted via the capacitor to the integrating read amplifier.

REFERENCES:
patent: 3536830 (1970-10-01), Hakki
patent: 3540011 (1970-11-01), Stupp et al.
patent: 4495409 (1985-01-01), Baji et al.
patent: 4605969 (1986-08-01), Green
C. Anagnostopoulos, "Signal Readout in CID Image Sensors", IEEE Transactions on Electron Devices, vol. ed. 25, No. 2, 2/78, pp. 85-89.
IEEE Transactions on Nuclear Science, vol. 19, No. 3, Jun. 1972, pp. 418-422, R. Kurz, "Low-Noise Preamplifier for High Court".
B. B. Baker, "Photodiode Array Noise Compensation Circuit," IBM Technical Disclosure Bulletin, vol. 17, No. 11, Apr. 1975, pp. 3321-3322.

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