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While I understand basic control loop and sample data system theory, I am by no means an expert in that field. That said, here’s the way I would look at this. In a continuous-time (analog) control loop system, the output is measured, the error term generated, and the corrective action (voltage change, for example) all happen in a continuous, non-discrete ...


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Just to clean up some terminology: You're always sampling at twice the Nyquist rate. The Nyquist rate is a function of the sampling rate. You want the Nyquist rate to be greater than your maximum frequency of interest. Your loop frequency response may have a corner frequency f, which must be below the Nyquist rate. However, the loop transfer function may ...


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