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Old 4th December 2006, 04:53 AM   #1
Bonsai is offline Bonsai  Taiwan
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Default Bipolar OP Stage Error Correction

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.
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File Type: jpg h-c ec 1.jpg (14.8 KB, 439 views)
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Old 4th December 2006, 05:10 AM   #2
clem_o is offline clem_o  Philippines
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Schematic can't be read - too much compression (?)... Suggest not using JPEG on black and white / line art drawings...

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Old 4th December 2006, 05:17 AM   #3
Bonsai is offline Bonsai  Taiwan
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Here is the LT spice Zip file - should be easier
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File Type: zip h-c ec 1.zip (2.2 KB, 65 views)
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Old 4th December 2006, 07:17 AM   #4
AndrewT is offline AndrewT  Scotland
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Easier, no.
It's arrives as .asc file
Where is LT Spice when I need it?
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Old 4th December 2006, 08:18 AM   #5
Bonsai is offline Bonsai  Taiwan
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Can you open it?
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Old 4th December 2006, 10:51 AM   #6
Bonsai is offline Bonsai  Taiwan
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clearly bipolar EC does not seem to be of any interest!

RIP bipolar EC thread.
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Old 4th December 2006, 11:03 AM   #7
clem_o is offline clem_o  Philippines
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Give it some time - the rest of the world's asleep when you posted...

:-)

cheers
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Old 4th December 2006, 12:45 PM   #8
AndrewT is offline AndrewT  Scotland
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and the other half can't open it.
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Old 4th December 2006, 09:34 PM   #9
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Quote:
Originally posted by AndrewT
and the other half can't open it.
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Old 4th December 2006, 10:31 PM   #10
ilimzn is offline ilimzn  Croatia
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Why do R7 and R11 have different values?
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