Light emitting element drive circuit

Details Light emitting element drive circuit Light emitting element drive circuit

1991-05-10

1992-03-17

Miller, Stanley D.

Electrical transmission or interconnection systems

Personnel safety or limit control features

Interlock

307355, H03K 342

Patent

active

050971450

ABSTRACT:
A light emitting element drive circuit which has high operation speed, low current consumption and provides an optical output signal with minimum distortion. An inverted input signal is applied to a second transistor which drives a differentiating circuit. The differentiating circuit drives a third transistor which provides a current path for discharging the light emitting element. The light emitting element discharges when the input signal falls. The input of the differentiating circuit and the input of the light emitting element drive circuit are isolated to prevent "back gating" distortion of the optical signal.

REFERENCES:
patent: 4647792 (1987-03-01), Meslener et al.
patent: 4806803 (1989-02-01), Yamashita
patent: 4818896 (1989-04-01), Cavanna

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