Free Sample
Electronic CAE and Programming Fundamentals ENGD1025 Passive RC Band pass filters
Solution.pdfBandPass Filter
The band pass filter allows only frequencies that are between two cut-off frequencies to pass through them. They filter out the low and high frequencies and are used in audio systems to filter a specific band of frequencies. The cut-off frequency of the high-pass filter stage is setup to be lower than the cut-off frequency of the low-pass filter stage. The passive band-pass filter is made up of two resistorsand two capacitorsas shown.
Figure 1. A Passive Band-Pass filter
*(https://www.electronics-tutorials.ws/filter/filter_4.html)
Figure 2. Passive Band-pass filter
Calculate the cut-off frequencies from the above resistor and capacitor values:
fH=12πR2C2 and fL=12πR1C1
The lower cut-off and higher cut-off frequency in a band pass filter is the frequency below which, and beyond which, the output signal is greatly attenuated respectively. Thesefrequenciesare given by the expressions above.At both cut-off frequencies the output voltage is 70.7% of that of ~Vin and -3dB below the maximum.
Figure 2. Frequency response (Bode Plot) and Phase shift plot.
*(https://www.electronics-tutorials.ws)
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Run the AC Sweep using Vac for the input voltage (10V) and plot the frequency response, gain and phase shift.
(Simulation settings –> AC sweep –> logarithmic -> from 10Hz to 1Meg, points/dec = 1000)
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Calculate the theoretical cut-off frequency and compare with the simulation value. Note down the max output voltage also.
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Use Vsin (Amplitude 10V, Frequency 10 Hz) and show the input and output waveforms.
(Simulation settings –> Time Domain –> Run to Time = 500ms, Maximum step-size = 10u)
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Use Vsin (Amplitude 10V, Frequency 1 Meg Hz) and show the input and output waveforms.
(Simulation settings –> Time Domain –> Run to Time = 0.01ms, Maximum step-size = 0.01u)
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Use Vsin (Amplitude 10V, Frequency 3KHz) and show the input and output waveforms.
(Simulation settings –> Time Domain –> Run to Time = 3ms, Maximum step-size = 0.1u)
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Try to design a band-stop filter with a stop band between 1KHz and 10KHz.
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