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Design >> Analog Design >> Miller compensation
https://designers-guide.org/forum/YaBB.pl?num=1459402030

Message started by Ayala Olivares on Mar 30^th, 2016, 10:27pm

Title: Miller compensation
Post by Ayala Olivares on Mar 30^th, 2016, 10:27pm

Can someone explain me how to analyze this amplifier?

Title: Re: Miller compensation
Post by ULPAnalog on Mar 31^st, 2016, 2:16pm

Hello

At a first glance this looks to be as a Miller compensated two stage opamp with RHP zero cancellation. In context of attached figure, A is a two stage amplifiers formed by cascading two common source stages. To stabilize the same a Miller capacitance is added as shown in B. One of the ways of cancelling the RHP zero introduced due to Miller compensation, is to have a buffer as shown in C [Ref. Gray and Meyer]. However, this not what the circuit posted by you seems to be doing (The supposed buffer is actually inverting in the example you posted).

Title: Re: Miller compensation
Post by ULPAnalog on Mar 31^st, 2016, 2:17pm

Sorry missed out the attachment on the previous occasion.

Title: Re: Miller compensation
Post by Ayala Olivares on Apr 10^th, 2016, 9:16pm

Thank you, you're right is a indirect compensation with a voltage buffer