AR #21994 - Virtex-4 RocketIO - What is the value of the internal AC coupling capacitor and the subsequent corner frequency of the high-pass filter?

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Virtex-4 RocketIO - What is the value of the internal AC coupling capacitor and the subsequent corner frequency of the high-pass filter?

AR#	21994
Part	HW-Rocket_IO
Last Modified	2008-05-19 00:00:00.0
Status	Active
Keywords	RocketIO, internal, AC, coupling, capacitor

Description

Keywords: RocketIO, internal, AC, coupling, capacitor

What is the value of the internal AC coupling capacitor and the subsequent corner frequency of the high-pass filter?

Solution

The nominal values of the input structure are as follows:
C = 6.5 pF
R = 600K

which result in a corner frequency of
F_corner = 40.8 kHz