6.1 AC-Coupling
(Ask a Question)PCIe electrical signals require a 75 - 200 nF AC-coupling capacitor between the transmitter and receiver. All transmitters are AC-coupled, either within the media or within the transmitting component itself. If located within the media, the AC-coupling capacitors are placed close to the transmitter. The AC-coupling capacitor is used in conjunction with internal termination for PCIe link detection.