sharpsharpie
Newbie
Hi all,
I am working on a multi-board design where a simplified block diagram is shown below. The FPGA's transceiver block uses 0.95VDD and PHY uses 3.3VDD. So I need to use AC coupling caps to route SGMII between the FGPA and PHY. Data rate is 1.25Gbps and traces are impedance controlled
I've seen multiple app notes about location of the AC coupling caps (TX side, RX side, or anywhere) but none of them provide any theoretical explanation. The FPGA's datasheet says it's ok to put the caps anywhere.
In summary I think there are 4 possibilities of placing AC coupling caps.
I'm sure each option has its pros and cons. Which way is most desirable way?
I am working on a multi-board design where a simplified block diagram is shown below. The FPGA's transceiver block uses 0.95VDD and PHY uses 3.3VDD. So I need to use AC coupling caps to route SGMII between the FGPA and PHY. Data rate is 1.25Gbps and traces are impedance controlled
I've seen multiple app notes about location of the AC coupling caps (TX side, RX side, or anywhere) but none of them provide any theoretical explanation. The FPGA's datasheet says it's ok to put the caps anywhere.
In summary I think there are 4 possibilities of placing AC coupling caps.
I'm sure each option has its pros and cons. Which way is most desirable way?