Bias control circuit for light-emitting diode having temperature compensation
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United States of America Patent
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-
Jul 16, 1985
Grant Date -
N/A
app pub date -
Feb 8, 1983
filing date -
Feb 11, 1982
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A bias control circuit for a light-emitting diode having compensation of the light output at changing temperature, in which the light-emitting diode (led) used as temperature sensor is taken up together with a series resistor (R3) in a series circuit to which a fixed supply voltage is applied. A further series circuit of two resistors (R1, R2) having strongly different values is connected parallel across the series resistor (R3) and a differential amplifier (A1) is provided, the one and the other input of which are connected respectively to the junction of the two resistors (R1, R2) and to a setting voltage (Vi), and the output of which is connected to a control means (Tr1) taken up in series with the one series circuit.
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