Fully balanced Opamp

[jam]

forr,

Thanks for the information.

I could not find the article................buried somewhere.
I have not seen the circuit used in any commercial design and JLH has not publised a full design using it. The idea should lend itself well to a balanced bridged design.

Regards,

Jam

 

[Nelson Pass]

For what? For my version or if I want to use the John Lindsey Hood current mirror? What about an DC-Servo?

You need something for either version. You could have the output of a servo
driving the current source of the JFETs. A similar concept is found on the
THS4131 symmetric gain stage.

Alternatively you can load the output to ground and put adjustments in the
circuit for exactly establishing a balance point (hoping that it doesn't drift much).

😎