Photoelectric converting circuit having a low parasitic capacita

Details Photoelectric converting circuit having a low parasitic capacita Photoelectric converting circuit having a low parasitic capacita

1985-11-13

1987-01-20

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

307311, H01J 4014

Patent

active

046381520

ABSTRACT:
A bootstrap negative feedback type photoelectric converting circuit for converting an optical signal into an electrical signal. A light receiving element receives incident light and provides an electrical signal to a field effect transistor (FET) and an inverting amplifier. A bipolar transistor is directly connected to the FET in complementary fashion to increase the gain of the source-follower amplifier to substantially unity and to reduce its output impedance to a very small value in order to reduce the effects of parasitic capacitance of the light receiving element at high frequencies.

REFERENCES:
patent: 3463928 (1969-08-01), Murphy
patent: 3670184 (1972-06-01), Idei et al.
patent: 3984824 (1976-10-01), Blackburn
patent: 4516019 (1985-05-01), Eertink et al.

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