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Laboratory 2 Rev Active Filters

# Laboratory 2 Rev Active Filters - bandwidth as well as...

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Applied Electronics Laboratory Laboratory 2 Active Filters Purpose : Construct and evaluate a fourth-order lowpass filter and a resonant bandpass filter. Materials : Breadboard, signal generator, oscilloscope, power supply (u 15 volts), LF356, resistor assortment, .01 uF capacitors, 0.1 uF capacitors. Make C = 0.1 a F in all circuits shown below. 1) Construct the fourth-order filter shown below. Calculate all resistor values for a Butterworth filter with ω c = 10 kHz. Measure the frequency characteristics with particular attention to the region around the cutoff frequency. How do these frequency characteristics compare with those expected? What is the most likely cause of any differences? 1 2) Construct the resonant bandpass filter shown below. Calculate resistor and capacitor values for a center frequency of 20,000 rad/sec (3,183 Hz). Use a value of C of .01 μF. Measure the frequency characteristics with enough detail to determine the filter’s

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Unformatted text preview: bandwidth as well as maximum attenuation. Calculate Q from the bandwidth. Compare these frequency characteristics with those expected? + V out V in _ Op amp C R C R R 1 R 2 + _ Op amp C R C R R 3 R 4 1 _ LF 356 V out V in R 1 C + C R 2 R 3 The report should contain: A) The two frequency plots (done using MATLAB) and: All frequency plots should be in dB versus log f . The frequency plots for the 4 th order Butterworth and Resonant bandpass filter should also show a plot of the ‘theoretical’ frequency plot obtained in MATLAB using the transfer function. (Substitute jω for s in the transfer function, transcribe into MATLAB code, and evaluate for values of ω over a least 3 orders of magnitude.) B) A Table showing calculated and measured values of the gain, the maximum slopes, and BW for circuits 1 and 2 and the Q for circuit 2. 2...
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• Spring '08
• Semmlow
• High-pass filter, Low-pass filter, Butterworth Filter, Applied Electronics Laboratory Laboratory, resonant bandpass filter

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