differential amplifier input voltages

Hi dvenashka98 ,

Good day! 
Thanks for using LTSpice and having interest on the ADA4932.
Can you send out your .asc file and how do you measure your output?

I copied your schematic and I'm getting the expected differential gain of 2 on my side.

I attached the .asc file I used, please try and let us know if you have more questions.

Thanks and Best Regards,
Dann

ADA4932_test.asc

dvenashka98 said:

Each generator's output is 500 mVpp, but there's less than 10 mVpp on each of the amplifier's input.
Is it his correct work?

Hello,

your difference amplifier works (as most OpAmp circuits) with negative feedback. That reduces the voltage swing at the summing node/at the ICs input pin.

So yes: it's correct and normal, that the voltage swing the the input pins of the IC ("right side" of RG1 and RG2) is much smaller than the voltage swing at the input of the amplifier circuit ("left side" of RG1, RG2). As Dann has shown this gives you the intended gain of 2 at the output pins.

best regards

Achim

Hi Dann,
Thanks for your answer. I'm also getting gain of 2, that's OK.
The question was about input levels to the amplifier itself.

Hi dvenashka98 ,

Got it!
Apologies, it was an honest mistake I really thought you're referring to the output.
Good to know the model is working fine on your side.

Best Regards,
Dann