This is an easy way to simulate loop-gain in SPICE. This circuit is very simple design. This circuit is built by op amps. This is the figure of the circuit.
The AC source (VAC) provides the energy to make the voltages in the loop non-zero. The negative of the ratio of the resulting voltages on either side of the AC source (-VB/VA) is the loop-gain, and is easily calculated from the simulation results. Note that VAC is not part of the loop-gain calculations; it is only used to disturb the closed feedback loop. Also, a unity gain buffer would be simulated by setting ZF = 0 and removing (opening) ZS.
The AC source (VAC) provides the energy to make the voltages in the loop non-zero. The negative of the ratio of the resulting voltages on either side of the AC source (-VB/VA) is the loop-gain, and is easily calculated from the simulation results. Note that VAC is not part of the loop-gain calculations; it is only used to disturb the closed feedback loop. Also, a unity gain buffer would be simulated by setting ZF = 0 and removing (opening) ZS.
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