I have a differential pair used for high speed digital stuff. It needs to be ac coupled to the receiver. The signals can be on some common-mode voltage on the order of 0 to
+3V. The question is where to put the ac coupling caps? Near where the signal enters the board, or near the chip's inputs?
Does the DC level bias adversely affect the high frequency performance (loss) of the material underneath the traces? I suppose at 3KV there might be something but at 3v?
Anyone? John?