Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Patent
1994-02-07
1995-09-05
Westin, Edward P.
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
356215, 327342, 327514, 2502081, G01J 146
Patent
active
054480566
ABSTRACT:
A photoelectric converting circuit having a photodiode generating a photoelectric current in accordance with the quantity of light, a first integrating circuit integrating the photoelectric current to convert it into a voltage, and a charge amplifier amplifying the change in the output voltage of the first integrating circuit. The charge amplifier is composed of a second integrating circuit and a coupling capacitance connected between the output of the first integrating circuit and the input of the second integrating circuit. The change in the output of the second integrating circuit is proportional to the ratio of the coupling capacitance to the integration capacitance of the second integrating circuit. This makes it possible to improve the sensitivity of the photoelectric converting circuit without reducing the value of the integration capacitance of the first integrating circuit.
REFERENCES:
patent: 4390258 (1983-06-01), Mizokami
patent: 4666301 (1987-05-01), Gruenke
patent: 5198660 (1993-03-01), Yokoyama et al.
patent: 5233180 (1993-08-01), Tsuruta et al.
patent: 5307145 (1994-04-01), Schenkel et al.
patent: 5322994 (1994-06-01), Uno
Fuji Electric & Co., Ltd.
Lee John R.
Westin Edward P.
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