THD in LTSpice ? - Page 8 - 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
Thread Tools Search this Thread
Old 29th November 2010, 07:29 PM   #71
Join Date: Jan 2005
Why are you complaining on my pics ? You arent complaining on oversize pics posted by others.

Either way these are the last pics, this project is done.
  Reply With Quote
Old 30th November 2010, 08:36 AM   #72
dadod is offline dadod  Croatia
diyAudio Member
dadod's Avatar
Join Date: Apr 2006
Location: Zagreb
How to plot distortion versa frequency in LTSpice?
  Reply With Quote
Old 30th November 2010, 09:28 AM   #73
diyAudio Member
jan.didden's Avatar
Join Date: May 2002
Location: Great City of Turnhout, Belgium
Blog Entries: 7
Originally Posted by AndrewT View Post
what causes the phase "bump" between 3Hz and 500Hz? Is that audible? Does it matter?

87degree phase margin, brilliant.
Does it change much when a little bit of cable capacitance is allowed for?
It's not really a bump. The open loop gain rolls of from about 100Hz.
Then there's a low pass at around 10Hz caused by probably the feedback decoupling cap (or maybe the input coupling cap).
These are two separate things; because they are relatively close on the graph they just look like a bump.

jan didden
If you don't change your beliefs, your life will be like this forever. Is that good news? - W. S. Maugham
Check out Linear Audio!
  Reply With Quote
Old 30th November 2010, 01:21 PM   #74
macboy is offline macboy  Canada
diyAudio Member
Join Date: Oct 2003
Location: Ottawa, Canada
Originally Posted by dadod View Post
How to plot distortion versa frequency in LTSpice?
Well, you can't plot it, but you can "step" the frequency parameter (look in Help and at the examples). The simulation will run several times at different frequencies and the distortion will be measured each time, assuming you use a .four statement. You can then copy the results from the sim log and chart them in excel.
  Reply With Quote
Old 30th November 2010, 02:37 PM   #75
Join Date: Jan 2005
And heres the end of this saga:
Click the image to open in full size.

This amp now plays in stereo and sounding awesome!! Thank you deeply for all the tips and help.
  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
OT: how can I measure THD of my amplifier if my sound card is 0,02% THD ? ygg-it Solid State 1 13th June 2010 08:54 AM
Using LTSpice gaetan8888 Solid State 6 19th July 2007 01:33 AM
RIAA in LTspice Herrmann Tubes / Valves 2 17th September 2004 08:28 PM
LTSpice Issue... mikeks Solid State 17 3rd September 2004 08:42 AM
Ltspice.... mikeks Solid State 10 13th June 2004 09:10 PM

New To Site? Need Help?

All times are GMT. The time now is 11:15 AM.

vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2015 DragonByte Technologies Ltd.
Copyright 1999-2015 diyAudio

Content Relevant URLs by vBSEO 3.3.2