Hi Yucheng, Welcome to TI E2E forum. Can you please let me know what your actual signa from the op-amp (amplitude and common-mode voltage) and also the frequency of your signal are? The transformer in the circuit you highlighted is a current transformer that is commonly used to measure a current from in metering or grid application. ADS131M02 can be used to measure a true differential signal or a single-ended signal (AINxN is shorted to GND as shown in the figure 9-6 in the datasheet). BR, Dale
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