Hello everyone, Chinese engineers sent me two AD9288 100 ADCs, and I joined two AD8009ARZ together. I would like to ask, is there too much AD8009 counterfeit in China B2C, I have tested 2M square wave is not clear here, 1M square wave is normal, the result of the engineer discussion is that the ADC is only 100MHZ, and some engineers think it is a filter problem. The filter of the operational amplifier has been solved