Miller Compensation Thread - diyAudio
Go Back   Home > Forums > Amplifiers > Solid State

Solid State Talk all about solid state amplification.

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 6th July 2013, 11:39 PM   #1
Zero D is offline Zero D  United Kingdom
diyAudio Member
 
Join Date: Aug 2009
Lightbulb Miller Compensation Thread

I'm sure i'm not the only one who's noticed various discussions "etc" taking place in other threads. Threads can easily evovle in ways they wern't initially intended, for all sorts of reasons. So i thought it'd be better if we could have a dedicated one of it's own. It also avoids highjacking other peoples threads.

Here's a few links to start off with, which although they mention CMOS IC's, "appear" to incorporate some interesting solutions. I couldn't view them, as i'm not a member of the IEE, but i expect some of you are, & could therefore hopefully shed some further light on the subject.

*

Quote:
A two-stage amplifier with active miller compensation

A two-stage amplifier with active miller compensation is presented in this paper. Unlike the two-stage amplifier with conventional miller compensation, the proposed structure doesn't contain right half plane zero. What is more, a left half plane zero is created to cancel the first non-dominant pole. The proposed structure improves the bandwidth significantly and reduces the dimension of the compensation capacitor. The proposed two-stage amplifier is designed and simulated in standard 0.6 ?m CMOS process. Simulation results show that the unit-gain frequency is increased by 9.4 times with only 38% increase in power consumption. The overall FoM is improved by 31.5 times.

https://ieeexplore.ieee.org/xpl/logi...mber%3D5967452

Quote:
Quote:
Design guidelines for reversed nested Miller compensation in three-stage amplifiers
The reversed nested Miller compensation technique applied to a three-stage operational amplifier is discussed in this paper and new and simple design equations, accurately predicting the loop-gain phase margin, are developed. Techniques for parasitic positive-zero cancellation are also investigated and compared. For this purpose, we found that using ing resistors is unpractical. Instead, exploiting only one follower (either a voltage or a current one) in the compensation branch results to be more appropriate. Indeed, not only does it avoid any additional constraint on stage transconductance, but it also overcomes the inherent limitations incurred by voltage and current followers when used to compensate two-stage amplifiers. Post-layout simulations on a CMOS opamp using the parameters of a 0.35-?m process are found to be in good agreement with the expected results.

https://ieeexplore.ieee.org/xpl/logi...mber%3D1198363

Quote:
Miller compensation using current buffers in fully differential CMOS two-stage operational amplifiers

Several Miller compensation schemes using a current buffer in series with the compensation capacitor to modify the right-half-plane zero in fully differential two-stage CMOS operational amplifiers are analyzed. One scheme uses a current mirror as a current buffer, while the rest use a common-gate transistor as a current buffer. The gain transfer functions are derived for each topology, and approximate transfer-function coefficients are found that allow accurate estimation of the zero(s) and poles.

https://ieeexplore.ieee.org/xpl/logi...337%2F01266829
  Reply With Quote
Old 7th July 2013, 11:26 AM   #2
diyAudio Member
 
Join Date: Nov 2010
There is a lot of literature on compensation of CMOS amps.
The RHP zero is a major issue because of the low transconductance of MOSFETs. Much less of an issue for a typical bipolar VAS audio amplifier.
There are several theses on-line that are public access.
Educational but of limited relevance.

Best wishes
David.
  Reply With Quote
Old 9th July 2013, 08:55 AM   #3
diyAudio Member
 
Join Date: May 2011
Location: Ho Chi Minh city
Is this Miller caps secondary IPS like Bod Cordell's book
said?!
  Reply With Quote
Old 9th July 2013, 05:44 PM   #4
Zero D is offline Zero D  United Kingdom
diyAudio Member
 
Join Date: Aug 2009
Quote:
Originally Posted by Dave Zan

Educational but of limited relevance
OK, but they were just for starters

@ Walkalone

Not sure, but somebody on here must know, you might think ?
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
pole splitting with miller compensation Dan Moos Solid State 8 1st June 2013 12:43 PM
Amplifier with nested Miller compensation matze Solid State 43 30th April 2013 05:22 PM
VAS with Miller compensation zero GEirin Solid State 9 28th February 2010 01:36 PM
Cascode VAS miller compensation Rafael L Solid State 9 5th March 2009 02:06 AM
No miller compensation Electron Solid State 38 10th January 2005 12:40 PM


New To Site? Need Help?

All times are GMT. The time now is 06:55 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2