2
\$\begingroup\$

I have two signal sources providing the same differential audio signal (VIN1 and VIN2). I want to sum those signals. The result (VOUT) shall also be differential.

The idea is to take a fully-differential op-amp and to sum the inputs just as you would do it in a single ended inverting adder configuration.

Will this work?

A quick LTspice simulation seems to work as expected. However, I could not find any examples on the internet, so maybe I am missing something?

Fully differential adder

\$\endgroup\$

1 Answer 1

2
\$\begingroup\$

That works - both device inputs are virtual earths so the currents from the signal sources sum at these points and you make a fully differential adder.

\$\endgroup\$

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge that you have read and understand our privacy policy and code of conduct.

Not the answer you're looking for? Browse other questions tagged or ask your own question.