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Chapter: Electronic Circuits - Feed Back Amplifiers

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Nyquist Criterion

The Aβ is a function of frequency. Points in the complex plane are obtained for the values of Aβ corresponding to all values of ‘f’ from - a to a .

Nyquist Criterion

 

Criterion Of Nyquist:

 

   The Aβ is a function of frequency. Points in the complex plane are obtained for the values of Aβ corresponding to all values of ‘f’ from - a to a . The locus of all these points forms a closed curve.

The criterion of  nyquist is that amplifier is unstable if  this curve encloses the point         (-1+j0), and the amplifier is stable if the curve does not enclose this point. 


The amplifier is unstable if this curve encloses the point –1+j0 and the amplifier is stable if the curve does not enclose this point




The amplifier is unstable if this curve encloses the point –1+j0 and the amplifier is stable if the curve does not enclose this point


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