[SI-LIST] LVPECL AC COUPLING - CAPACITOR VALUE for 1.25G Ethernet
- From: salvador JR <sa_jr@xxxxxxxxx>
- To: mikesa@xxxxxxxxxx, si-list@xxxxxxxxxxxxx
- Date: Mon, 4 Feb 2002 18:18:41 -0800 (PST)
Hello All,
If I want to size the value of the AC coupling
capacitor used for DC blocking in a differential
LVPECL link should my input frequency range be the
same as the resonat frequency of the capacitor?
For example:
For a ceramic SMT capacitor of NPO dielectric
if the capacitance is 18 pF
The resonant frequency is 1250.44 MHz
The impedance (vs frequency) is 0.593 ohms
ESR = 0.59 ohms and
ESL = 0.9 nH
Where the impedance over frequency is calculated
using:
Z = sqrt[Rs^2 + (X_C -X_L)^2]
Where Rs = ESR
is 18pF the value of the capacitor for my DC blocking
in LVPECL differential link used for 1.25Gbps serial
data?
Thank you.
-- Sal
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