[SI-LIST] : Bit stream definition in HSPICE

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From: Hassan Ali (hali@nortelnetworks.com)
Date: Thu Mar 29 2001 - 10:35:01 PST


In HSPICE, which of the following is the correct 500Mbps, tr=100ps,
tf=100ps, 101010101... bit stream definition?

(1)

Vin in gnd pulse(v1 v2 td tr tf pw per)
.param v1=0v v2=3.3v td=0ns tr=100ps tf=100ps pw=1.8ns per=4ns

(2)

Vin in gnd pulse(v1 v2 td tr tf pw per)
.param v1=0v v2=3.3v td=0ns tr=100ps tf=100ps pw=1.8ns per=3.8ns

I've always thought that case (1) is the correct one, but I have seen some
people using case (2). I'm now not so sure which is the correct way.
Clarifications will be appreciated.

Thanks.

Hassan.

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