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Practical Op Amp Differentiator Lab

Objectives:

To build, predict, and measure the characteristics of a practical differentiator in various regions of operation.


Figure 1: A Practical Differentiator

1. Assuming steady state AC operation, calculate Avmb , fa , fb , fc , and fd for the circuit shown in Figure 1.



2. Construct the circuit shown in Figure 1.

3. Looking at Figure 1 as a differentiator for frequencies below, fb , predict, observe and simulate on PSpice Vo for the following input waveforms. Express the predicted value of Vo as Vop sin(2π f t + θ) for waveforms A, B, and C.

A. Vi = 0.5V sin 2π 100t

B. Vi = 0.5V sin 2π 500t

C. Vi = 0.5V sin 2π 1000t


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For waveforms D through F below, sketch two full cycles of the input waveform and the predicted, measured, and PSpice output waveforms on graph paper.

D. Vi = ± 1V triangle wave at 100Hz

E. Vi = ± 1V triangle wave at 500Hz

F. Vi = ± 1V triangle wave at 1kHz

G. Vi = ± 250mV square wave at 1kHz


4. Looking at Figure 1 as a band pass filter;

A. Use PSpice to find, Avmb , fcenter , flow , fhigh , and Plot Phase of Vo from 1Hz ≤ f ≤ 1MHz.

B. Measure the circuit in Figure 1 for, Avmb , fcenter , flow , fhigh , and compare the results to the Bode plot calculated in step 1.

5. Looking at Figure 1 as an integrator for frequencies above fc for an input Vi = ± 10mV square wave at 50kHz, predict, measure, and simulate on P-Spice the output waveform. Sketch the results on graph paper for comparison.



Lab Notes

Lab Data


Electrical Engineering lab key words: Practical operational amplifier differentiator, opamp, AC operation, waveforms, bode plot, center frequency, Pspice, input and output voltage, difference, cycles.

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