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Observer wrxue
Observer
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Registered: ‎09-19-2019

[ZCU111+XM500] Why the differential port of ADC is so bad?

My experiments:

Step 1:Confirm the source is not bad.

Connect DAC_T0_CH3 Positive signal with ADC_T0_CH0. And signal of DAC is 200MHz sigle tone. 

Physical                                                                                  Rftool GUI

 10766635326909.jpg1.PNG

The result of DAC P and DAC N is the same (expected).

Now, I confirm my signal source is not bad.

Step 2:Connect DAC_T0_CH3 P and N with ADC_T3_CH0 P and N

First, I ensur that no signal in ADC_T3_CH0 without connection.

2.PNG

And now connect DAC_T0_CH3 P and N with ADC_T3_CH0 P and N

Physical                                                       Rftool GUI

10766707815462.jpg3.PNG

All noise increase!(-100dBFS to -60dBFS)

My experiment finished.

Why the differential port of ADC is so bad?

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