testing distortion/noise on a X'd amp?

rif · 18th August 2004, 12:04 AM

I had this thought on my ride home tonight: what would happen if you sent the same signal to both + and - inputs on a balanced X'd amp?

Wouldn't the result at the output be the amplified noise of the amp? Seems like if the supersymetric concept is good at eliminating noise between 2 identical inverted signals, it would be excellent at eliminating the signal if passed 2 identical signals.

Does anyone with an o-scope, an X'd amp, and some time to spare want to give it a try?

Nelson Pass · 18th August 2004, 06:23 PM

That's how we get our Input Common Mode Rejection (CMMR)
spec. It is in excess of 60 dB down from what the result would
be from the same voltage applied differentially.

18th August 2004, 12:04 AM	#1
rif diyAudio Member Join Date: Jan 2003 Location: Southern NJ	testing distortion/noise on a X'd amp? I had this thought on my ride home tonight: what would happen if you sent the same signal to both + and - inputs on a balanced X'd amp? Wouldn't the result at the output be the amplified noise of the amp? Seems like if the supersymetric concept is good at eliminating noise between 2 identical inverted signals, it would be excellent at eliminating the signal if passed 2 identical signals. Does anyone with an o-scope, an X'd amp, and some time to spare want to give it a try?

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18th August 2004, 06:23 PM	#2
Nelson Pass The one and only Join Date: Mar 2001	That's how we get our Input Common Mode Rejection (CMMR) spec. It is in excess of 60 dB down from what the result would be from the same voltage applied differentially.

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