Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Solid State Talk all about solid state amplification.

Differential to differential amplifier
Differential to differential amplifier
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 15th August 2007, 07:20 AM   #1
Cauhtemoc is offline Cauhtemoc  Sweden
diyAudio Member
 
Join Date: Jun 2007
Default Differential to differential amplifier

Hello everyone,
I'm working on something wich require a differential to differential amplifier. I do not want to use op amps for this, only discrete components.

I have tried to use various versions of the common long tailed pair, but the high gain causes it to behave like a comparator. Normally you loop back a portion of the output to one of the inputs (i.e. feedback), can I still do this if I need both inputs and outputs?

Any help would be most appreciated.
  Reply With Quote
Old 15th August 2007, 07:26 AM   #2
jan.didden is offline jan.didden  Europe
diyAudio Member
 
jan.didden's Avatar
 
Join Date: May 2002
Location: The great city of Turnhout, BE
Yes. You can use feedback from one output to an input, as well as from the other output to the other input. Both input signals then go to each input through a resistor, to be summed at the actual input point with the feedback signal.

Seems to me you need a sim to play with. Thry downloading SWCAD III, everybody here seems to use it. It's free.

Another smart move would be to study the internal diagram of a diff-to-diff opamp datasheet like the OPA1632.

Jan Didden
__________________
Music is dither to the brain; lets me think below the usual chaos - me
Get more Linear Audio for less! Check out my Autoranger and SilentSwitcher
  Reply With Quote
Old 15th August 2007, 07:35 AM   #3
tbr is offline tbr  Switzerland
diyAudio Member
 
Join Date: Dec 2003
Location: Swiss Pampa
I would have a closer look at Nelson Pass' stuff...
__________________
Thomas
  Reply With Quote
Old 15th August 2007, 07:39 AM   #4
jan.didden is offline jan.didden  Europe
diyAudio Member
 
jan.didden's Avatar
 
Join Date: May 2002
Location: The great city of Turnhout, BE
Quote:
Originally posted by tbr
I would have a closer look at Nelson Pass' stuff...

Of course. And Erno Borbely's.

Jan Didden
__________________
Music is dither to the brain; lets me think below the usual chaos - me
Get more Linear Audio for less! Check out my Autoranger and SilentSwitcher
  Reply With Quote

Reply


Differential to differential amplifierHide 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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Fully differential and pseudo-differential stages rtarbell Solid State 22 2nd June 2007 05:21 PM


New To Site? Need Help?

All times are GMT. The time now is 04:03 AM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 16.67%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright ©1999-2017 diyAudio
Wiki