Bias control circuit for light-emitting diode having temperature

Details Bias control circuit for light-emitting diode having temperature Bias control circuit for light-emitting diode having temperature

1983-02-08

1985-07-16

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including temperature compensation means

330296, H03F 304

Patent

active

045299498

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.

REFERENCES:
patent: 3686517 (1972-08-01), Sexton

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