[SI-LIST] Better choice for AC Coulplilng(calrification)

Hi.
typically LVPECL to LVPECL interface (or others)using AC coupling as follows :
There are pullup/pulldown resistors not illustrated. 
The first diagram use one capacitor and the second diagram use two capacitors 
to coupling
the interface.
I wann'a to know which one is better?
What's the priority for each case?

____                       ___ 
|TX |-------||---------|RX |
|___|-------||---------|___|

 ___                          ___ 
|TX |----||---------||---|RX |
|___|----||---------||---|___|
 

----- Original Message ----- 
From: "hariharan" <hariharan@xxxxxxxxxxx>
To: <zanglinyuan@xxxxxxxxxx>; <si-list@xxxxxxxxxxxxx>
Sent: Thursday, December 19, 2002 8:24 PM
Subject: [SI-LIST] Re: Better choice for AC coupling


> 
> could you please make it clear. I dont understand the question
> 
> do you meant 2 cards are sitting on the backplane with a capacitance for
> crosstalk minimization in between?
> 
> kindly ellaborate.
> 
> regards
> Hariharan
> 
> -----Original Message-----
> From: si-list-bounce@xxxxxxxxxxxxx
> [mailto:si-list-bounce@xxxxxxxxxxxxx]On Behalf Of zanglinyuan
> Sent: Thursday, December 19, 2002 5:24 PM
> To: si-list@xxxxxxxxxxxxx
> Subject: [SI-LIST] Better choice for AC coupling
> 
> 
> Hi.all
> we often use AC coupling circuit for differential signal especially
> different level type.
> 
> Now I'm designing a system interface as following:
> driver card-------backplane---------receiver card
> 
> No doubt ,we need at least one capacitor series in the path to realize
> interconnect.
> Some vendor also recommend using two capacitors as following:
> 
> driver card----||---backplane-----||----receiver card
> 
> which is better to use one or two capacitors?
> What's the priority for each case?
> 
> for above system ,when use one capacitor,where is better to place?
> 
> By the way,The simulation result at receiver card is no difference when we
> place one or two capacitor series in the circuit.
> 
> 
> Thanks.
> 
> 
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