A band-stop filter passes frequencies between its lower and upper critical frequencies and rejects all others.
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Electrical Engineering · all questionsPassive Filters
Passive Filters
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The bandwidth of a resonant filter is determined by the quality factor (Q) of the circuit and the resonant frequency.
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In a certain parallel resonant band-pass filter, the resonant frequency is 14 kHz. If the bandwidth is 4 kHz, the lower frequency
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Vout = 500 mV and Vin = 1.3 V. The ratio expressed in dB is
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A series resonant band-stop filter consists of a 68 Ω resistor, a 110 mH coil, and a 0.02 µF capacitor. The internal resistance, RW, of the coil is 4 Ω. Input voltage is 200 mV. Output voltage is taken across the coil and capacitor in series. What is the output voltage magnitude at f0?
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In a series resonant band-pass filter, a lower value of Q results in
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Critical frequencies are also called -3 dB frequencies.
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A band-pass filter rejects all frequencies within a band between a lower and an upper critical frequency and passes all others.
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In a certain parallel resonant band-pass filter, the resonant frequency is 14 kHz. If the bandwidth is 4 kHz, the lower frequency is
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An RC high-pass filter consists of an 820 Ω resistor. What is the value of C so that Xc is ten times less than Rat an input frequency of 12 kHz?
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The same signal in Problem 2 is applied to an RC high-pass filter. If the reactance is zero at the input frequency, the output voltage is
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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
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In a certain low-pass filter, fc = 3.5 kHz. Its pass-band is
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The roll-off rate of a basic RC or RL filter is 20 dB per decade.
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A series resonant band-pass filter consists of a 2 mH coil, a 0.005 µF capacitor and a 120 Ω resistor. The winding resistance of the coil is 12 Ω. The output voltage is taken off the resistor. Input voltage is 12 Vrms. What is the output voltage magnitude at the center frequency (f0)?
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In an RC high-pass filter, the output is taken across the resistor and the output leads the input.
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In an RL high-pass filter, the output is taken across the inductor and the output leads the input.
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At a certain frequency, the output voltage of a filter is 6 V and the input is 12 V. The voltage ratio in decibels is
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The output voltage is 63.3% of its maximum at the critical frequencies.
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An RC low-pass filter consists of a 120 Ω resistor and a 0.002 µF capacitor. The output is taken across the capacitor. The circuit's critical frequency is
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