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Old 28th March 2012, 01:43 PM   #31
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Quote:
Originally Posted by bear View Post
Dizzy. The music goes round and round...

Speaking of which, while I have all of you here looking at that schematic, might I request that you all take a look here, and lend a hand? There may be some similarities, but I am not sure:
Les Sage Amps
Regardless of similarity, the question is how does this one work?? It is alleged to have both sliding bias and also SOA protection of some sort. (post 44 and beyond have real schematics)

_-_-bear
Hi Bear,

I'm sorry to say so, but 'Les Sage Amps' is a totally different kettle of fish.

Cheers,
E.
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Old 28th March 2012, 02:08 PM   #32
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Its Alex, you should have my full name from the emails we exchanged some months back.

I based a design around the crossquad idea, problem is I get 20Khz openloop bandwith, unity close to 100 Mhz and 85 db loop gain. Linearity wise not great but 10ppm levels independant of amplitude and frequency till 50 khz is appealing. Feedforward can better this but trying for least complexity. I am on the same as this design of yours but ppb from the crossquad no way.
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Old 28th March 2012, 02:30 PM   #33
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Quote:
Originally Posted by Edmond Stuart View Post
Hi Bear,

I'm sorry to say so, but 'Les Sage Amps' is a totally different kettle of fish.

Cheers,
E.
Sure, but if any of you would care to analyze and comment on them it would be appreciated.

_-_-bear
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Old 28th March 2012, 02:41 PM   #34
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Please don't do it here, but there where it belongs.
This thread is about the Super TIS. Don't pollute it.
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Old 28th March 2012, 03:05 PM   #35
Bonsai is offline Bonsai  Taiwan
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Nice website you have Edmond. I will await your findings - should be interesting.
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Old 28th March 2012, 03:26 PM   #36
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Default Findings

Hi Bonsai,

Regrettably, my findings will be limited to the results of simulation. I'm a designer and not a builder (any more). So I hope that somebody else is willing to build and test this front-end (perhaps Ovidiu )

Cheers,
E.
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Old 28th March 2012, 04:23 PM   #37
Bonsai is offline Bonsai  Taiwan
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LOL! I won't volunteer - I am just too busy unfortunately.

Are you doing anything in Jan's magazine?
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Old 28th March 2012, 04:48 PM   #38
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Bonsai, you've a PM.
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Old 28th March 2012, 04:57 PM   #39
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BTW, Some comparisons with a few other front-ends:
PGP: complexity: 45 trannies, THD20k = 53ppb
Super TIS: complexity: 18 trannies, THD20k = 74ppb
Bob's HEC: complexity: 19 trannies, THD20k = 1057ppb
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Old 28th March 2012, 05:05 PM   #40
KSTR is offline KSTR  Germany
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Edmond, very clever circuit as far as I can judge. Me likes the input filter with the divided-down feedback from the output to get back down at the input level. Not many people know or use this trick with Sallen-Keys, let alone with capacitors...
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