Has this been tried?

scott wurcer

Disabled Account
2004-01-26 3:03 pm
Belmont MA
Has anyone here implemented an amplifier with a circuit like the one at the link below?

JFET Follower Amplifier Cancels Distortion | Analog content from Electronic Design


I'm sure Dimitri built proto-types, I don't see any reason for them not to work as shown if reasonable care is taken with layout/construction. Some of the distortion nulls are a little sharp and it might be informative to measure them over supply and temperature variation. I found it frustrating to be able to get a perfect null and not be able to hold it even though the net benefit was still large.
 
Thanks, Scott.

I just happened to notice it and wondered what it might have been applied to, in audio, and, basically, whether or not it was worth pursuing.

Would it be reaonable to try to scale it, e.g. for a power amp application?

Just thinking out loud (before even really understanding how the circuit works), I wonder if there is a way to replace or augment Rs with a circuit that would continuously auto-adjust, or compensate.
 

scott wurcer

Disabled Account
2004-01-26 3:03 pm
Belmont MA
Thanks, Scott.

I just happened to notice it and wondered what it might have been applied to, in audio, and, basically, whether or not it was worth pursuing.

Would it be reaonable to try to scale it, e.g. for a power amp application?

Just thinking out loud (before even really understanding how the circuit works), I wonder if there is a way to replace or augment Rs with a circuit that would continuously auto-adjust, or compensate.

This would be a line stage/buffer type circuit, they usually scale poorly for high current drive. For a known resistance drive you get high feedback THD out of an essentially open-loop circuit (one could pick nits of course about the current replication being feedback).
 
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