First, related to the lab, we derived the relation of input and output
voltages for a difference amplifier with nodal analysis
We also used nodal analysis to evaluate a nonstandard implementation of a difference amplifier
Proceeding to the lab, we determined resistances to use given constraints of input resistance and gain. Also shown here are the circuit diagram and first set of data. Resistor values were measured at 9.82k, 9.86k, 19.8k, 19.9k
The second data set
The implemented circuit
Plot of both data sets
Summary
We see the expected results for the most part. va is subtracted from vb, yielding an output of their difference with a gain of 2. We again see saturation of the op amp, this time at different voltages: ~4.3V at the positive end and ~3.5V at the negative end, showing that the OP27 op amp does not necessarily supply evenly, nor all the way to its rail voltages.
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