Hello, I will check with the customer if he can confirm on your question. In the meantime the customer informed me about the following: They measurements at the inputs of the ADCs (25MHz clock frequency, which can be switched on and off), using a special pre-amplifier (used at EMC near field measurements) and a oscilloscope with spectrum analyzer functionality. A 50MHz signal was clear visible, coming out of the ADC, and within the input range. The base frequency was not visible. When switching off the ADC (with the clock still on), the signal disappeared. Is it possible that, even that there is a low pass filter, this signal could be measured (it comes out of the ADC)? This could lead to the alternating signal, as seen in the previous send pictures, as added to the signal. Regards, Meir.
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