It works as you say, but also works keeping them, quote from the manual:Actually, you didn't set up the loop meter correctly in your Plecs model. It already includes the perturbation source, you don't want a second perturbation source in the design. You also need to select the correct perturbation and response type in the analysis options.
Perturbation
The Small Signal Perturbation block that will be active during the analysis.All other perturbations blocks will output 0.
Plecs is quite intuitive, but as any simulation tool, has a learning curve. If you don't manage to measure loop gain in your Plecs simulation, what make you think that it's easier with a SPICE tool?
Actually, you didn't set up the loop meter correctly in your Plecs model. It already includes the perturbation source, you don't want a second perturbation source in the design. You also need to select the correct perturbation and response type in the analysis options.
The result should look like below:
View attachment 146104
By nature, the tool can't measure DC gain. But it's almost pointless to measure the DC gain of a PI control loop with ideal integrator. It can be hardly smaller than infinity. If you don't believe it, vary the set point by a small delta amount and watch the output error.
out of curiosity what type of loop is that. That looks like a modified PI (two pole one zero) with a pole-pole-zero configuration as opposed to the more typical pole-zero-pole. Is that correct?
No, that is the loop gain. Closed loop transfer function does not help in designing in the frequency domain.he result you showed me is it the closed loop circuit?
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