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nonlinearity of differential amplifier

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hellotxn

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I want to measure an amplifier with diferential input. What is the special point of this structure compred with normal single end amplifier when evaluate the nonlinearity of them?
 

One consideration:
Differential structures normally have better second order (non)linearity.
 

just input a specific frequency differential AC signal
plot FFT and if your amps is linear enough your Total Harmonic Distortion will be small
 

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