10.2 Differential Amplifier Analog Simulation with MPLAB® Mindi™
In MPLAB® Mindi™, open Differential_Amplifier.wxsch schematic from the GitHub repository.
The circuit shown in the left half of Figure 1, is driven by VDD/2 for the first op amp and a 25 Hz 256 mVPP sinusoidal signal source with 1.65V DC offset for the second op amp. Both op amps are powered by a 3.3V power supply.
Simulate by selecting; Simulator → Run Schematic or press Function Key F9. The resulting simulation output graph is shown in the right half of Figure 1. It can be seen that the peaks of the bottom signal representing the differential output are ±384 mV, which are as expected as the peaks of the input sinusoidal are ±128 mV relative to VDD/2.