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

zanglinyuan
 These blocking caps are often utilized to prevent voltage spikes from
damaging inputs when you hot swap modules. Depending which module you
intend to hot swap (driver or receiver) dictates where the Cap belongs.
Unless you are including all of the parasitics for pads you probably won't
see simulation differences. Depending on frequency, edge rates and layout
rules you may observe a difference in the lab.

Regards,
bob

www.sisoft.com
-- 
Robert Haller (rhaller@xxxxxxxxxx)
Signal Integrity Software Inc.
6 Clock Tower Place, Suite 250
Maynard, MA 01754
Phone: (978) 461-0449, ext 15
>
> 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 |
> |___|----||---------||---|___|
>
>
.....
>> 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.
>>
>>

-- 
Robert Haller (rhaller@xxxxxxxxxx)
Signal Integrity Software Inc.
6 Clock Tower Place, Suite 250
Maynard, MA 01754
Phone: (978) 461-0449, ext 15


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