By Wayne H. Tuttle - February 10, 2020
Why Conditionally Stable Systems Do Not Oscillate
Nyquist's 1933 paper on regeneration stated that a feedback control system could, at some frequencies, have 360 degrees of phase shift and more than unity gain without instability. At first glance it appears that this cannot be true. At these frequencies, the signal would progress around the loop...
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Content from H. Dean Venable and Dr. R. David Middlebrook
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