30-06-2012, 02:21 PM
To plot the frequency response of m-derived high pass filter
To plot the frequency response of m-derived high pass filter..docx (Size: 23.09 KB / Downloads: 37)
theory:
A high pass filter is one, which passes high frequencies above cut-off frequency and attenuates the rest of the lower frequencies. The circuit representation of m-derived high pass filter section (T & Π sections) has shown below:
In the m-derived high pass filter the shunt arm is a series LC circuit that offers almost zero impedance at the frequency of its series resonance. At the resonant frequency, f∞ the transmission through the filter is zero i.e. the attenuation becomes infinite the resonant frequency is:
PROCEDURE:
1. Connect sine wave generator at the input of the filter. Adjust sine wave amplitude to 5Volt p-p. Keep the input voltage constant throughout the experiment.
2. Connect CRO at the output of the filter.
3. Vary the input frequency from minimum to 10KHz in proper steps in sine wave generator and every time note the input frequency and corresponding output voltage from the CRO in the observation table.
4. Plot the graph between input frequency & output voltage taking input frequency (in Hz) on x-axis and output voltage (in Volts) on y- axis on semi log graph paper.
5. Calculate the cut-off frequencies from the formula as well as from the graph.