Zen -> Cen -> Sen, evolution of a minimalistic IV Converter - Page 10 - diyAudio
Go Back   Home > Forums > Source & Line > Digital Source

Digital Source Digital Players and Recorders: CD , SACD , Tape, Memory Card, etc.

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 7th September 2011, 01:53 PM   #91
diyAudio Member
 
Joachim Gerhard's Avatar
 
Join Date: Mar 2009
I am in if you like.
  Reply With Quote
Old 7th September 2011, 02:01 PM   #92
EUVL is offline EUVL  Europe
diyAudio Member
 
Join Date: Oct 2003
> I do not plan to go into competition.

Was never meant to be.
I have no problems at all which design comes out "on top".

It will probably be a subjective preference in the end.
They are all elegant designs, and have very low distortions anyhow.




Patrick
  Reply With Quote
Old 7th September 2011, 02:34 PM   #93
diyAudio Member
 
Joachim Gerhard's Avatar
 
Join Date: Mar 2009
Your circuit sounds good, thats for sure. I just listened to it yesterday.
  Reply With Quote
Old 7th September 2011, 02:38 PM   #94
EUVL is offline EUVL  Europe
diyAudio Member
 
Join Date: Oct 2003



Patrick
  Reply With Quote
Old 8th September 2011, 09:21 AM   #95
EUVL is offline EUVL  Europe
diyAudio Member
 
Join Date: Oct 2003
We have spiced a modified version of Joachim's circuit with complementary input FETs, Wilson current mirrors and fixed rails.
With 1mA input and 2.7k R_iv, THD is 0.039%.
The model used identical BJTs in both current mirrors (i.e. perfect match).

We'll test hardware when proto PCB is ready.


Patrick

.
Attached Images
File Type: png cen-iv-cm-sim-20110908c.png.png (84.4 KB, 1055 views)

Last edited by EUVL; 8th September 2011 at 09:26 AM.
  Reply With Quote
Old 8th September 2011, 10:45 AM   #96
Piersma is offline Piersma  Netherlands
diyAudio Member
 
Piersma's Avatar
 
Join Date: Jan 2003
Location: Netherlands
Default THD

hi Patrick,

THD is 0.039% or 0.0039%?
Thanks for sharing your version of this great IV!

best regards,
Piersma
  Reply With Quote
Old 8th September 2011, 10:48 AM   #97
EUVL is offline EUVL  Europe
diyAudio Member
 
Join Date: Oct 2003
You are right. Typing mistake. 0.0039% for CEN CM IV.
CM stands for current mirror.

Under same conditions in Spice, CEN IV (floating supply) is 0.0019%.
But probably a better current mirror will imprive things for CEN CM.


Patrick
  Reply With Quote
Old 8th September 2011, 01:38 PM   #98
diyAudio Member
 
Joachim Gerhard's Avatar
 
Join Date: Mar 2009
That does not look too bad. Have you tried my single ended cascoded version too ?
Distortion should go down when you use the helper transistors. Also try differential feedback by connecting 50kOhm to 100kOhm resistors from the inputs of the mirrors to the outputs.
  Reply With Quote
Old 8th September 2011, 02:00 PM   #99
diyAudio Member
 
Joachim Gerhard's Avatar
 
Join Date: Mar 2009
The diagram i am posting now should reduce distortion by a factor of 5 theoretically.
Attached Files
File Type: pdf CEN CCS precission mirror.TSC - TINA.pdf (11.5 KB, 445 views)
  Reply With Quote
Old 8th September 2011, 02:02 PM   #100
diyAudio Member
 
Joachim Gerhard's Avatar
 
Join Date: Mar 2009
The diagram appears on page two. That is an artifact of my drawing program.
  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
FOR REGA Turntable>>> The heavy weight + Vta adjuster+ceramic ball prooptiki Swap Meet 1 22nd May 2010 05:57 PM
Multi-DAC: Lynx AES16 -> DIR9001/SRC4392 (-> SRC4192) -> PCM1794A novec Digital Line Level 11 11th May 2010 11:57 AM
> Audio <> music <> quick <> synergy <> angst>? rick57 Everything Else 0 4th May 2007 04:03 PM
&gt;&gt;&gt; cheap 50,000uF 60V capacitors here &gt;&gt;&gt; Lubomir Swap Meet 0 1st February 2007 03:36 PM


New To Site? Need Help?

All times are GMT. The time now is 01:37 PM.


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