Photo-current log-compression circuit

Details Photo-current log-compression circuit Photo-current log-compression circuit

1977-02-09

1978-06-20

Mullins, James B.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

250214C, 250214L, 307310, 307311, 328 2, H01J 3912

Patent

active

040963829

ABSTRACT:
A photoelectric current log-compression circuit includes a log-conversion diode, a photodiode and an operational amplifier for log-compression. In the negative feedback circuit of the operational amplifier is inserted a thermistor to control the amplification degree of the operational amplifier according to the current flowing through the log-conversion diode. Further, a forward voltage of a temperature compensating diode biased with a constant current is applied to the reference voltage of the operational amplifier.

REFERENCES:
patent: 3525942 (1970-08-01), Boronkay et al.
patent: 3676686 (1972-07-01), Allington
patent: 3992622 (1976-11-01), Numata et al.
patent: 4015149 (1977-03-01), Tsunekawa et al.
patent: 4038555 (1977-07-01), Freeman

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