Laboratory Manual - King Fahd University of Petroleum and Minerals

3. Design bilinear circuit to have a zero at 830 Hz a pole frequency at 13kHz and HF
gain of 14.1. Select C1=50nF. What will be the DC gain?
4. Design the all-pass filter to realize a 120 o phase shift at 60Hz. Use resistors of
R 1 =10kΩ and C=1μF.
SPICE:
5. Using SPICE simulates the different filters and submits their frequency responses.
Use op amp model of experiment 4.
EXPERIMENTAL WORK
1. Assemble the circuits shown in Figure 1 (Do not forget the supplies of the op amp).
Apply sinusoidal input voltage with constant amplitude of 1V, and vary the frequency
within the range decided by your hand calculations of the prelab. In each case
monitor the input and output voltages on a dual trace oscilloscope.
2. Measure the output voltage and plot your results on the provide graph sheet.
3. From your measurements determine the various parameters of each filter type.
4. For the HPF, bilinear, and allpass filters keep increasing the frequency and monitor
the output until the gain starts roll-off (decrease). What is the reason for this problem?
5. Compare your hand calculations, SPICE simulations and experimental measurements
and tabulate them in Table I.
6. Comment on your results.
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