Evolve Non Global Feedback Distortion Cancellation Power Amplifier

[ontoaba]

There is also speed based error cancellation:
http://www.diyaudio.com/forums/solid-state/6362-halcro-amplifier.html
also
http://www.diyaudio.com/forums/atta...-douglas-self-wants-your-opinions-gate-cc.png
but any speed based EC needs some tuned oscillation canceling too.

PS: on that link http://www.ne.jp/asahi/evo/amp/Dnfb/edc.htm. A' amplifier should has an error too. Best EC is tuned version (passive).

 

[31697B]

Looks like this subject is going to be fun.

😎🙂

 

[tapout]

For simplicity here also the experimental circuit.

Patrick

Works OK in SPICE.. I guess.

 

[Petr1951]

similar follower on BJT with higher parameters: BJT_follower_Radioamator_2002_04.pdf
It is important that the resistor R3 is equal to the load resistance.
Unlike the repeaters can receive on JFET zero output voltage.
Output stage with corrector Hawksford with completion Bob Cordell:
http://zalil.ru/34815250


best regards
Petr

 

[padamiecki]

more on this topology in excellent Dado's thread:
http://www.diyaudio.com/forums/solid-state/238252-odnf-no-gnfb-power-amp-4.html

 

[Petr1951]

earlier works can be found here
Radiohobby_2011_04.pdf
best regards
Petr