11-3-11 Elementary Operational Amplifiers

# Figure 2 the voltage follower circuit figure 3 the

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Figure 2. The voltage follower circuit Figure 3. The measurements from the simulated oscilloscope

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Figure 4. The measurements from the real oscilloscope Once we had the circuit working, we were asked to increase the frequency until the waveforms lost coherency. This was noted to occur at approximately 1kHz. Table 1. The values measured with the real oscilloscope. Input Output Wave Type Sine wave Sine wave () 1.00 1.00 Frequency () 100 99.6 With these results, we can measure the voltage gain and the phase shift: Such a device could be used as a buffer between two voltage sources, as the output voltage is the same as the input, yet the two circuits are essentially isolated. II. Inverting Amplifier As this section is very similar to the previous, and as a matter of fact all of the following sections are, the same basic format will be used. For this portion of the lab, we were given a circuit (Fig. 5) to build. We then measured the input and output functions with the oscilloscope. The properties of the input voltage were a sine wave with a 2V peak-to-peak amplitude and 1kHz frequency. Note, in figure 5, the AC voltage source has been replaced with a function generator. This will be useful for the sections using more exotic wave types coming up.
Figure 5. The inverting amplifier circuit Figure 6. The measurements from the simulated oscilloscope Figure 7. The measurements from the real oscilloscope Once we had the circuit working, we were asked to increase the frequency until the waveforms lost coherency. This was noted to occur at approximately 2kHz.

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