Bipolar OP Stage Error Correction

Bonsai · 4th December 2006, 05:53 AM

moderator, apologies If I have started a second thread in error, but here goes anyway.

This is my attempt below at Hawksford-Cordell (H-C) error correction in a bipolar output stage.

Simulated at 20KHz and 8 Ohm load, EC gives 3.5 times improvement (0.12 down to 0.035) and with 2 ohm load 2x improvment (from 0.39 down to 0.15).

I don't want to get into the feedback/feedforward debate (because its a bit beyond me to be honest) but would appreciate some feedback.

BTW, I see opportunities here to combine EC with sliding bias but there may be loop stability issues that need to be investigated.

clem_o · 4th December 2006, 06:10 AM

Schematic can't be read - too much compression (?)... Suggest not using JPEG on black and white / line art drawings...

Cheers!

Bonsai · 4th December 2006, 06:17 AM

Here is the LT spice Zip file - should be easier

AndrewT · 4th December 2006, 08:17 AM

Easier, no.
It's arrives as .asc file
Where is LT Spice when I need it?

Bonsai · 4th December 2006, 09:18 AM

Can you open it?

Bonsai · 4th December 2006, 11:51 AM

clearly bipolar EC does not seem to be of any interest!

RIP bipolar EC thread.

clem_o · 4th December 2006, 12:03 PM

Give it some time - the rest of the world's asleep when you posted...

:-)

cheers

AndrewT · 4th December 2006, 01:45 PM

and the other half can't open it.

powerbecker · 4th December 2006, 10:34 PM

Quote:

Originally posted by AndrewT
and the other half can't open it.

ilimzn · 4th December 2006, 11:31 PM

Why do R7 and R11 have different values?

4th December 2006, 08:17 AM	#4
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	Easier, no. It's arrives as .asc file Where is LT Spice when I need it? __________________ regards Andrew T.

4th December 2006, 09:18 AM	#5
Bonsai diyAudio Member Join Date: Aug 2006 Location: Taipei, Taiwan	Can you open it? __________________ bonsai http://www.hifisonix.com/

4th December 2006, 11:51 AM	#6
Bonsai diyAudio Member Join Date: Aug 2006 Location: Taipei, Taiwan	clearly bipolar EC does not seem to be of any interest! RIP bipolar EC thread. __________________ bonsai http://www.hifisonix.com/

4th December 2006, 01:45 PM	#8
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	and the other half can't open it. __________________ regards Andrew T.

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4th December 2006, 06:10 AM	#2
clem_o diyAudio Member Join Date: Jun 2005 Location: Manila	Schematic can't be read - too much compression (?)... Suggest not using JPEG on black and white / line art drawings... Cheers!

4th December 2006, 12:03 PM	#7
clem_o diyAudio Member Join Date: Jun 2005 Location: Manila	Give it some time - the rest of the world's asleep when you posted... :-) cheers

4th December 2006, 11:31 PM	#10
ilimzn diyAudio Member Join Date: Feb 2005 Location: Zagreb	Why do R7 and R11 have different values?

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