Intrinsically safe opto-coupler circuit having an optimum data transmission rate
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United States of America
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Nov 17, 1998
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N/A
app pub date -
Jul 3, 1997
filing date -
Jul 3, 1997
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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.
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