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A shunt capacitor is used in an AC coupling circuit to accomplish a pulse-width limiting function without voltage doubling.
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AC Coupling Circuit Using Shunt Capacitor
A shunt capacitor is used in an AC coupling circuit to accomplish a pulse-
width limiting function without voltage doubling.
An INPUT signal is applied to an open-collector buffer 1, such as an inverter
(as shown) or a non-inverting buffer. When the output of buffer 1 is low, the
OUTPUT signal from comparator 2 is high. This is so because the minus input of
comparator 2 is always at a lower voltage than the plus input of comparator 2
when the output of buffer 1 is low. When the INPUT signal changes state to
cause the output of buffer 1 to go high, the minus input of comparator 2
temporarily becomes positive relative to the plus input of comparator 2. This
causes the OUTPUT signal to drop to a low level for a predetermined time period
related to the RC time constant of the circuit. The equivalent resistance, R, in
this time constant is calculated as resistor R4 in series with the parallel
combination of resistors R1 and R2, in parallel with resistor R3.
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