I saw the circuit below in AD-FMCOMMS6-EBZ schematic, which is the Evaluation board of the AD9652.
Each lowpass filter is placed on the differential line of the LVPECL signal. I suspect this may have been used to remove the hormonic component in the LVPECL signal.
1. What is the purpose of this filter?
2. When using this filter, the LVPECL will have 1dB attenuation. Does this attenuation affect ADC performance?
3. If this filter is used to remove the harmonics of the clock, I would like to know how the harmonics affect the ADC performance.
[edited by: seung-gon at 12:37 PM (GMT -5) on 26 Jan 2022]