Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Patent
1998-05-28
2000-07-04
Ham, Seungsook
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
330110, 330308, H01J 4014, H03F 136
Patent
active
060842326
ABSTRACT:
An inverting amplification circuit and a feedback resistor are connected in parallel with each other between an input terminal and an output terminal, so that an input current flowing from a photodiode can be converted into an output voltage. Furthermore, a shunt transistor is disposed with its source connected with the input terminal, its gate connected with the output terminal and its drain connected with a ground power supply. When the input current is large, a current flowing into the feedback resistor is decreased, so that a part of the input current can be shunted by the shunt transistor in accordance with a voltage difference between the input terminal and the output terminal. Thus, the output voltage waveform can be free from ringing.
REFERENCES:
patent: 4623786 (1986-11-01), Rodwell
patent: 4902982 (1990-02-01), Moore et al.
patent: 5532471 (1996-07-01), Khorramabadi et al.
patent: 5539779 (1996-07-01), Nagahori
patent: 5636048 (1997-06-01), Kogure et al.
patent: 5786730 (1998-07-01), Hadley
D. Yamazaki et al., "A Wide Dynamic Range Preamplfiier IC", 1996 IEICE Grand Conference, p. 675 and partial English translation thereof.
Ham Seungsook
Matsushita Electric - Industrial Co., Ltd.
Pyo Kevin
LandOfFree
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