It is a Easy make Electronic Circuit Project of Fiber optic led
driver Circuit. The pull-up transistor of the totem-pole output is
used-to turn on the LED and the pull-down transistor is used to turn off the LED. The lower impedance and higher current handling
capability of the saturated pull-down transistor is used as an effective
method of transferring the charge from the LED`s anode to ground as its
dynamic resistance increases during turn-off. The slightly higher
output impedance of the pull-up stage ensures that the LED is not over
peaked during the less difficult turn-on transition.
Fiber Optic LED Driver Circuit Diagram:
This asymmetric current handling capability of the output stage with its
variable impedance substantially reduces the pulse-width distortion and
long-tailed response. As the signal propagates through two NAND gates,
each transition passes through the high-to-low and low-to-high
transition once, normalizing the total propagation delay through the
circuit.
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