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Why must the coefficient of the first-order term s in the denominator of formula (6.3.14) in the figure be greater than zero for the circuit to operate stably?

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If the book is equipped with amplitude-frequency characteristic curves corresponding to different (1+R2/R1), it will be easier to understand by comparing the curves.   Details Published on 2021-10-11 10:59

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Less than zero, that is, (1+R2/R1) is greater than 3.

What is (1+R2/R1)? It is the voltage gain of the common-mode amplifier. If (1+R2/R1) is greater than 3, the positive feedback is too large, and the loop gain is greater than 1, self-oscillation will occur.

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If the book is equipped with amplitude-frequency characteristic curves corresponding to different (1+R2/R1), it will be easier to understand by comparing the curves.

This post is from Analog electronics
 
 
 
 

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