In this lab, we explored the use of op amps with capacitors in order to gain an understanding of the steady-state circuit response to sinusoidal inputs. By comparing input and output signals, the circuit can be seen to provide some amplitude gain between the input and output signals, as well as a phase shift between the phasors of input and output. We measured the gain and phase change response of an inverting op amp and compared them to our theoretical expectations.
The circuit used in this lab is shown in the diagram below.
Our pre-lab assignment was to determine the value of R such that the angular frequency obtained was 864 rad/s.
Next, we built the circuit from the diagram above. Because there were no resistors near 526 Ohms, we decided to place 2 1k resistors in parallel to achieve a resistance of 500 Ohms. The actual circuit we built is pictured below.
We were able to obtain a square wave graph from the output voltage with an amplitude of 4V. This means we were able to take a sinusoidal voltage input and get a voltage output that looks like a square wave, where voltage is essentially switching between 4V and -4V.
In Class Examples:
1. Determine vo (t) for the op amp circuit below if vs = 3 cos 1000t V.
2. Refer to the circuit depicted below. Find the average power absorbed by each element.
3. Find the value of ZL in the circuit of below for maximum power transfer.
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