Document Type and Number:
Japanese Patent JPS52106054
Kind Code:
U
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.
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Application Number:
JP1374876U
Publication Date:
August 12, 1977
Filing Date:
February 09, 1976
Export Citation:
International Classes:
G06G7/24; H01J40/14; H03G3/20; H03G7/00; H03G11/08; (IPC1-7): H03G7/00; H03G11/08
Domestic Patent References:
| JP41017526A |