analog connection for converting single ended to differential

[yefj]

There is a circuit I built which inputs a differential and outputs differential present in Ltspice schematics. I want this circuit to input a single ended signal. Is there some active component or certain active configuration with this component which will transform single ended AC signal into differential signal? Thanks.

 

[danadak]

https://www.ti.com/lit/an/sbaa264b/sbaa264b.pdf?ts=1748171626631

https://www.ti.com/lit/an/sbaa265a/sbaa265a.pdf?ts=1748166292990

https://www.analog.com/en/resources/analog-dialogue/articles/single-ended-to-differential-signal-conversion.html

Regards, Dana.

 

[rjenkinsgb]

With any true differential input circuit, you can just connect one input to the common of the single ended signal, and the other input to the signal.

Use the circuit you have and ground one input, in other words.

 

[yefj]

Hello Dana,My signal is AC single ended what do I connect the Vocm?
Thanks.

https://www.analog.com/en/resources/analog-dialogue/articles/single-ended-to-differential-signal-conversion.html

 

[rjenkinsgb]

Is there some active component or certain active configuration with this component which will transform single ended AC signal into differential signal?

"Differential" means is takes the difference between any two signal connections you feed it.

A single-ended signal has that "difference" between it's common/screen/0v etc. and the actual signal point.
Those two connect directly. Adding components just over-complicates things and is likely to reduce the output accuracy.

The only reason to add a balanced output circuit is for connections between different pieces of equipment using long cables, where the noise or EM pickup on the connecting cable needs to be nulled out, or there can be ground noise.

 

[danadak]

Basic single ended circuit looks like :

This tool will hep you tailor your bias and Vcm -

https://www.analog.com/en/resources/interactive-design-tools/adi-diffampcalc.html

Curious why are you taking G with additional OpAmP ?

Needless to say if you do use the OpAmp closing the loop around the diff OpAmp
a simulation looking at phase margin would be mandatory.


Regards, Dana.