In terms of the Nyquist diagram, the critical value of A0β
is that for which the diagram passes through the (–1, 0) point. Reducing A0β below this
value causes the Nyquist plot to shrink and thus intersect the negative real axis to the right of
the (–1, 0) point, indicating stable amplifier performance. On the other hand, increasing A0β
above the critical value causes the Nyquist plot to expand, thus encircling the (–1, 0) point
and indicating unstable performance.
In terms of the Nyquist diagram, the critical value of A0βis that for which the diagram passes through the (–1, 0) point. Reducing A0β below thisvalue causes the Nyquist plot to shrink and thus intersect the negative real axis to the right ofthe (–1, 0) point, indicating stable amplifier performance. On the other hand, increasing A0βabove the critical value causes the Nyquist plot to expand, thus encircling the (–1, 0) pointand indicating unstable performance.
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