PSRR and Crosstalk - 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 18th June 2005, 06:22 PM   #1
diyAudio Member
 
Join Date: Nov 2004
Location: Boulder Colorado
Default PSRR and Crosstalk

I have a couple of questions about the interelationship between PSRR and Crosstalk as is relates to small scale discrete class A design.

I've been working with a couple of different class-a headphone amp designs that have been popularized on the head-fi.org. I've started testing them with RightMark Audio Analyzer and the stereo crosstalk figures are not that great (-60 to -75dB range).

The topology is known to have poor PSRR because of the discrete topology. My bench power supply is pretty clean, but not ultra pristine.

Q: Is there a specific relationship between amps with poor PSRR and poor crosstalk figures?

Q: What mitigations are typical to improve crosstalk figures in discrete class-a designs?
  Reply With Quote
Old 18th June 2005, 09:13 PM   #2
The one and only
 
Nelson Pass's Avatar
 
Join Date: Mar 2001
This is a complicated subject. There is not a general direct
relation between PSRR and crosstalk, but they are often
found together as a result of poor design or workmanship.

Nothing works as well as mono amplifiers and quiet supplies,
but you can build quieter stereo amplifiers by isolating and/or
filtering the supply rails, and you can improve PSRR by
locating those elements which let rail noise into the gain path
and fixing them up. Often this involves the use of high quality
constant current sources.

  Reply With Quote
Old 20th June 2005, 12:08 PM   #3
Banned
 
Join Date: Mar 2005
Location: Australia
to improve crosstalk use separate supplies
  Reply With Quote
Old 20th June 2005, 12:24 PM   #4
diyAudio Member
 
Join Date: Nov 2004
Location: Boulder Colorado
I'm building up two individual power supplies that will be very clean. If the measurements improve noticably, I'll post some results...
  Reply With Quote
Old 20th June 2005, 01:09 PM   #5
diyAudio Member
 
BobEllis's Avatar
 
Join Date: Sep 2003
Location: Upstate NY
just a thought - have you measured the crosstalk of your RMAA system with just a loop through connection? You may be measuring your sound card's limits. It's been a while, but I don't think mine was better than what you measured.
  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
Interaural crosstalk eStatic Everything Else 3 28th February 2008 04:53 PM
2 channels to 1 crosstalk dreamtear Parts 1 19th January 2008 01:42 AM
Crosstalk cancellation Prune Digital Source 10 19th January 2006 02:19 PM
Crosstalk cancellation Prune Everything Else 0 31st March 2004 12:11 PM
crosstalk conversation skyraider Solid State 5 24th January 2004 01:23 PM


New To Site? Need Help?

All times are GMT. The time now is 10:13 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