10.6: Procedure

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1. Notice that Figure 10.5.1 is a series-parallel non-inverting voltage amplifier. Calculate the theoretical voltage gain for the amplifier and record it in Table 10.7.1.

2. Assemble the circuit using \(C_c\) = 150 pF.

3. Set the generator to a 100 Hz sine wave.

4. Set the output voltage of the op amp to 1 volt peak. Measure and record the input voltage in Table 10.7.2. Also, compute the resulting voltage gain.

5. Using the decibel-reading voltmeter, increase the input frequency until the op amp’s output voltage drops 3 dB from it’s value at 100 Hz. If a dB meter is not available, use the oscilloscope to find the frequency at which the op amp’s output voltage drops to 0.707 times the 100 Hz value. (Note that –3 dB corresponds to a factor of 0.707.) Record the frequency in Table 10.7.2.

6. Change the generator to a 10 kHz square wave.

7. Increase the generator’s amplitude so that the output of the op amp is obviously slewed, about 10 volts peak (straight lines for the leading and trailing edges).

8. Measure the slew rate and record it in Table 10.7.2.

9. Repeat steps 3 through 8 using \(C_c\) = 33 pF and \(C_c\) = 10 pF.