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Old 10th January 2012, 04:06 AM   #1
Bigun is offline Bigun  Canada
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Default Diamond Buffer with reduced distortion

Mr Evil has been busy, I was wondering if anybody has tried this version ?

Mr Evil's Realm - Useful Components


Edit: sorry I managed to find an original thread, but it's short and not much report of anybody trying this design

Diamond buffer + source follower
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Last edited by Bigun; 10th January 2012 at 04:09 AM.
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Old 10th January 2012, 09:10 AM   #2
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Quote:
Originally Posted by Bigun View Post
Mr Evil has been busy, I was wondering if anybody has tried this version ?

Mr Evil's Realm - Useful Components


Edit: sorry I managed to find an original thread, but it's short and not much report of anybody trying this design

Diamond buffer + source follower
You know you can buy these as an IC. I've used them in video and they are impressive.

http://www.ti.com/lit/ds/symlink/opa860.pdf

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Old 10th January 2012, 09:30 AM   #3
Elvee is online now Elvee  Belgium
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Quote:
Originally Posted by Bigun View Post
Mr Evil has been busy, I was wondering if anybody has tried this version ?

Mr Evil's Realm - Useful Components


Edit: sorry I managed to find an original thread, but it's short and not much report of anybody trying this design

Diamond buffer + source follower
I have been using the principle for years, but I implement it in a different, simpler manner (IMHO anyway): I place the sensing resistors in the collectors, which avoids the need of multiple mirroring/translation.

With a single ended topology, the degree of compensation can be very high, close to perfection (BTW, the compensation is positive feedback, not negative).

In a PP, things are much more difficult: each half tries to impose its perfect output voltage to the other, and this ends in a destructive fight, unless some degeneration is added, but this degrades the performance.

This is the reason why I developped alternatives, with the complementary half asymetric, and slave to the "noble" upper half:
Halve the diamond, double the performance!!!
UniGaBuf, a follower cut out to be a leader
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