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Subject: Poles of Amplifiers

Date: 01/12/01 at 1:45 AM
Posted by: Cm
E-mail: tancming@yahoo.com
Message Posted:

Hello,

I have a question to ask regarding stability in amplifiers. In a multistage amplifier, for instance an opamp, there are many poles present within the circuit that causes the gain to drop and also the phase to change in the direction that approaches 180, upon which a negative fb amplifier will oscillate, i.e. unstable. The cause of this instability has often been the poles.But what about the zeroes, what does it do the amplifier, if zeroes works opposites to poles, then i should think that if we add as many zeroes to the amplifier stages as there are poles, then we will be able to counteract the instability in amplifiers caused by the poles.

If the above is true, what is the circuit that is representative of the zeroes, a resistor network??

Any attempt to enlighten is most grateful.

CM


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