AC Sweep Phase Margin Simulation

N

nico

Run an AC sweep using the @simulator and show the phase margin at the gain crossover frequency.

flux

I have 1 question before running the AC sweep:
  1. Should I use a generic op-amp model (open-loop gain 100 dB, dominant pole at 10 Hz) for U2, or do you have a specific SPICE macro-model you’d like me to use?
N

nico

Let's use the generic op-amp model with 100 dB gain and 10 Hz pole. Please proceed with the AC sweep.

flux

Here’s the summary of the AC sweep:

Table

MetricValue
Gain Crossover Frequency (f_gc)≈ 91 kHz
Phase Margin at f_gc≈ 90°
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C

sherilynolivec3po844848

The phase margin of ~90° looks good. Please show me a combined Bode plot with both magnitude and phase curves.
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V1
BATT2
-18v
+18v
BATT1
+18v
-18v
R1
Resistance
1KΩ
U2
Rf
Resistance
10KΩ

Opamp Stability [Sim]

Opamp Stability [Sim] thumbnail