I'm confused with this electric circuit which is signed out on the attachments,The circuit is made up by two parts:ADC driver(AD8138) & ADC(AD9214),Analog signal source come from pin5 of XS1,which is a continous analog signal.
My system is like this:the ture source is from a APD,then use three stage amplify the output of APD,then the analog signal go to pin5 of XS1.
The frequency of the sample clock(FPGA_CLK2) is 100MHz.
attachment<AD8138> is an image of circuit for AD8138;
attachment<AD9214> is an image of circuit for AD9214;
attachment<sheet_part> is a schematic diagram for AD8138 and AD9214 both,the schematic diagram is designed by Altium designer.
Would you please to give me some suggestions?