Non global feedback regulated supply for GC - diyAudio
Go Back   Home > Forums > Amplifiers > Chip Amps
Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Chip Amps Amplifiers based on integrated circuits

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
Thread Tools Search this Thread
Old 5th January 2004, 06:52 PM   #1
Pedja is offline Pedja  Serbia
diyAudio Member
Join Date: Jun 2002
Location: Belgrade
Default Non global feedback regulated supply for GC

I uploaded some info about the non-feedback regulator for GC, some of you might be interested for reading.


Click the image to open in full size.
  Reply With Quote
Old 5th January 2004, 07:06 PM   #2
Electrons are yellow and more is better!
diyAudio Member
peranders's Avatar
Join Date: Apr 2002
Location: Göteborg, Sweden
Blog Entries: 4
Have you tested the PSRR together with a LM3875? The IC itself has PSRR of 117 dB in the audioband, how much improvement do you really get? Isn't it better dynamics in no regulator at all (straight wire)? How about high current impedance?
/Per-Anders (my first name) or P-A as my friends call me
PA03 LM4780 amplifier group buy, SIGN UP HERE for the group buy 0 boards left. 118 paid.
  Reply With Quote
Old 5th January 2004, 07:39 PM   #3
Pedja is offline Pedja  Serbia
diyAudio Member
Join Date: Jun 2002
Location: Belgrade
The graphs you see are simulated. Real measurement of PSRR would take me some time (not the measurement itself, but making of set-up for this).

If you think about numbers, then I can agree you can’t gain anything sensible this way. But if you decide just to listen to the consequences, you can, for example, note that you can easily hear the change of the voltage reference (that anyway seats between the current source and low pass filter and that is not amplified). Yes, in the supply that anyway has 60dB PSRR and which feeds the circuit with 100dB+ PSRR.

Output impedance rapidly decreases when the drawn current increases. When it reaches 1A or going higher, the output impedance (its absolute value) of such regulator can compete to the majority of regulators with global feedback, but with that advantage of having smoother inductive raise. If you consider the simulation reliable, the output impedance of this regulator while it puts out 1A is attached.

Attached Images
File Type: gif zout_1a.gif (3.2 KB, 157 views)
  Reply With Quote


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
JLH without global feedback? rmgvs Solid State 8 24th December 2013 04:56 PM
Global Feedback on Mikael's KT88SE porkchop61 Tubes / Valves 7 28th May 2008 11:29 AM
Zen amplifiers and global feedback teodorom Pass Labs 19 20th October 2006 07:47 PM
Non (global) feedback amp/hawksford PanzerLord Solid State 6 11th December 2005 11:23 AM
Buffered IGC and global feedback? JoeBob Chip Amps 1 3rd October 2003 11:23 AM

New To Site? Need Help?

All times are GMT. The time now is 05:14 AM.

vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright ©1999-2017 diyAudio

Content Relevant URLs by vBSEO 3.3.2