Intrinsically safe opto-coupler circuit having an optimum data t

Details Intrinsically safe opto-coupler circuit having an optimum data t Intrinsically safe opto-coupler circuit having an optimum data t

1997-07-03

1998-11-17

Le, Que

Radiant energy

Photocells; circuits and apparatus

Signal isolator

250214A, G02B 2700

Patent

active

058380183

ABSTRACT:
An opto-coupler comprising an LED and a photo-transistor whose collector resistor is connected in parallel with a diode comprising the emitter-base junction of a second transistor. This diode prevents saturation of the photo-transistor and at the same time, the current through the emitter-base junction diode of the second transistor is amplified by the gain of the second transistor to achieve and optimum signal output level across the collector resistor of the second transistor. The emitter-base junction diode of the second transistor prevents the photo-transistor from saturating and, in so doing, improves the rise and fall times of the collector current of the photo-transistor. The operation of the photo-transistor in a nonsaturation mode and the optimization of its rise and fall times for its collector currents result in an improvement in the data rate of the input signal that can be accommodated by the opto-coupler circuit.

REFERENCES:
patent: 3973143 (1976-08-01), Embree et al.

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