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Old 28th August 2003, 03:54 AM   #1
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Default New Lin 3 stage design anyone?

Attached is a .doc which contains a .jpeg of a new amp design I've been working on. As of right now all I have is simulation, no test prototype. I was hoping some of the more knowledgeable engineers out there could check it out and help me optimize some values. Please no criticism based on subjectivism, this won't help. The amp topology is based on the Lin 3 stage with an EF type 2 output stage. The input is bootstrapped to lower the impedence of the NFB Network (lower noise). The input differential transistors are paralleled for the same reason. The VAS is a standard darlington with active load current source and buffers.
The output stage is EF type 2 utilizing a switchoff cap. As I said, any good engineering insight would be appreciated.

Thank-You,
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File Type: zip blm_amp.zip (35.3 KB, 530 views)
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Old 28th August 2003, 03:58 AM   #2
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Default circuitmaker file zipped

zipped circuitmaker file
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File Type: zip blm_ref_amp.zip (8.0 KB, 186 views)
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Old 28th August 2003, 04:03 AM   #3
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maybe...... the great... John Curl
......or the..... almighty .....Nelson Pass

Maybe I'm asking too much...

Nice to dream though!!
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Old 28th August 2003, 05:22 AM   #4
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Yes, I know there is no Zobel on the output stage, I left it out for space reasons.
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Old 28th August 2003, 05:28 AM   #5
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I can't open zips without a lot of trouble. Sorry.
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Old 28th August 2003, 05:52 AM   #6
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.gif

(hint, hint Mr. Curl)
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Old 28th August 2003, 05:58 AM   #7
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I can't get the file size small enough so that I can directly post it.
I guess I am out of luck.
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Old 28th August 2003, 06:02 AM   #8
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.jpeg
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File Type: jpg blmamp2.jpg (44.4 KB, 1748 views)
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Old 28th August 2003, 06:03 AM   #9
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Finally!
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Old 28th August 2003, 06:08 AM   #10
sajti is offline sajti  Hungary
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It looks nice. My only problem is that the emitter resistors for the output stage, are too low. There will be hard to fix the bias current with this value. I use 0.22ohms at least.

Sajti
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