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Passive Filters
A sinusoidal voltage with a peak-to-peak value of 18 V is applied to an RC low-pass filter. If the reactance at the input frequency is zero, the output voltage is
18 V peak-to-peak
zero
9 V peak-to-peak
12.74 V peak-to-peak
Correct Answer:
zero
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Passive Filters
In an RC low-pass filter, the output voltage is taken across the resistor and the output lags the input voltage.
In an RL low-pass filter, the output voltage is taken across the inductor and the output lags the input.
A band-stop filter passes frequencies between its lower and upper critical frequencies and rejects all others.
A band-pass filter rejects all frequencies within a band between a lower and an upper critical frequency and passes all others.
The bandwidth of a resonant filter is determined by the quality factor (Q) of the circuit and the resonant frequency.
The output voltage is 63.3% of its maximum at the critical frequencies.
In an RC high-pass filter, the output is taken across the resistor and the output leads the input.
Critical frequencies are also called –3 dB frequencies.
The roll-off rate of a basic RC or RL filter is 20 dB per decade.
In an RL high-pass filter, the output is taken across the inductor and the output leads the input.
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