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# ET1410 MODULE 3 BASIC OP-AMP CIRCUITS AND ACTIVE FILTERS LAB 3.1

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Author: Carol 96
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What is the purpose of a comparator?
What type of circuit uses hysteresis to avoid rapid switching due to noise?
Describe the transfer curve of a basic comparator circuit.
Transcribe the comparator waveforms from Plot 22-1 to the Plot below.
Describe how the threshold voltage changes the comparator output.
Transcribe the comparator transfer curve from Plot 22-2 to the Plot below.
Describe how the threshold voltage changes the transfer curve for a comparator.
Assume the circuit in Figure 22-2 had VREF set to zero volts. How would you expect the output to be affected by varying the dc offset control on the generator?
Transcribe the comparator transfer curve from Plot 22-3 to the Plot below.
Would a sinusoidal input to the comparators produce the same transfer curve as a triangle waveform? Explain.
Transcribe the Schmitt trigger waveform from Plot 22-4 to the Plot below.
Transcribe the Schmitt trigger transfer curve from Plot 22-5 to the Plot below.
Summarize the important differences between a comparator and a Schmitt trigger.
Assume the input signal in Figure 22-4 could have as much as 100 mVpp noise. In order to avoid multiple tripping due to noise, you need to set the trip points at least 100 mV apart. What is the minimum value of resistance that the potentiometer can be set? Assume the output saturates at 13 V
How is the output of a summing amplifier calculated?
List four common applications of summing amplifiers.
What is the major advantage of using summing amplifiers to connect different sources?
What is the purpose of the 7493 IC used in the first summing circuit?
Transcribe the Weighted DAC Summing Amplifier waveform from Plot 23-1 to the Plot below.
The step generator in Figure 23-4 forms negative falling steps starting at zero volts and going to a negative voltage (approximately –4.4 V). Explain why.
Assume that all three inputs to the summing amplifier (QA, QB, and QC) in Figure 23-4 are 4.5V. Compute the output voltage from the summing amplifier.

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