[SI-LIST] Re: SPECCTRAQuest: DC level shift with series caps
- From: Hassan Ali <hassan@xxxxxxxx>
- To: si-list@xxxxxxxxxxxxx
- Date: Wed, 13 Mar 2002 18:10:30 -0500 (EST)
Thanks all for your suggestions.
Actually, the sure way is that suggested by Lou - to run the simulation to
death!
Actually, in my case I had to run it for 2500 cycles!
Kumar's trick is interesting. I tried it but it didn't really solve the
problem. I still
had to run the simulation for a long time to obtain 0V DC. I appended the "gsw
1 2 .."
line (only one line) in the ESpice model of the capacitor.
Thanks again all for the support.
Regards.
Hassan.
On Mar 13, "C. Kumar" <kumarchi@xxxxxxxxx> wrote:
>
> try this.
>
> cdc 1 2 my_dccap
> gsw 1 2 i='if (time <= 0) (1e3 * v(1,2)) else 0'
>
> Patrick_Carrier@xxxxxxxx wrote:
> I agree with Lou. I know in Spice you can get around that anomaly by
> specifying an initial charge condition on the cap. I don't think there is a
> way to do that in Specctraquest though, so you need to just wait several
> cycles to look at the waveform.
>
> --Pat
>
> -----Original Message-----
> From: Sanchez, Louis [mailto:louis.sanchez@xxxxxxxxx]
> Sent: Wednesday, March 13, 2002 10:55 AM
> To: 'hassan@xxxxxxxx'; si-list@xxxxxxxxxxxxx
> Subject: [SI-LIST] Re: SPECCTRAQuest: DC level shift with series caps
>
>
>
> Hello Hassan............
>
> It will take several pulses before you see the expected results in an AC
> coupled network. I believe that you are dealing with the initial condition
> of time it takes for all storage elements (capacitors) to reach equilibrium.
> I suggest that you lengthen the period of your analysis in the Preferences
> section of SigXplorer.
>
> Lou A. Sanchez
>
> -----Original Message-----
> From: Hassan O. Ali [mailto:hassan@xxxxxxxx]
> Sent: Wednesday, March 13, 2002 6:49 AM
> To: si-list@xxxxxxxxxxxxx
> Subject: [SI-LIST] SPECCTRAQuest: DC level shift with series caps
>
>
>
> Hi All,
>
> I'm trying to use SigXplorer to simulate a link with a differential
> driver and series DC-blocking caps. Contrary to expectations,
> single-ended P and N outputs measured at the load are not centered
> around 0V DC, instead each one is given a separate DC shift. When I
> remove the series caps, the output is as expected - centered around 0V
> DC.
>
> Does anybody know what I can do to have the correct single-ended outputs
> with the series caps?
>
> Thanks.
>
> Hassan.
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> <P> try this.
> <P>
> <P>cdc 1 2 my_dccap
> <P>gsw 1 2 i='if (time <= 0) (1e3 * v(1,2)) else 0'
> <P>
> <P> <B><I>Patrick_Carrier@xxxxxxxx</I></B> wrote:
> <BLOCKQUOTE style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #1010ff
> 2px
solid"><BR>I agree with Lou. I know in Spice you can get around that anomaly
by<BR>specifying an initial charge condition on the cap. I don't think there is
a<BR>way
to do that in Specctraquest though, so you need to just wait several<BR>cycles
to look at
the waveform.<BR><BR>--Pat<BR><BR>-----Original Message-----<BR>From: Sanchez,
Louis
[mailto:louis.sanchez@xxxxxxxxx]<BR>Sent: Wednesday, March 13, 2002 10:55
AM<BR>To:
'hassan@xxxxxxxx'; si-list@xxxxxxxxxxxxx<BR>Subject: [SI-LIST] Re:
SPECCTRAQuest: DC level
shift with series caps<BR><BR><BR><BR>Hello Hassan............<BR><BR>It will
take several
pulses before you see the expected results in an AC<BR>coupled network. I
believe that you
are dealing with the initial condition<BR>of time it takes for all storage
elements
(capacitors) to reach equilibrium.<BR>I suggest that you lengthen the period of
your
analysis in the Preferences<BR>section of SigXplorer.<BR><BR>Lou A.
Sanchez<BR><BR>-----Original Message-----<BR>From: Hassan O. Ali
[mailto:hassan@xxxxxxxx]<BR>Sent: Wednesday, March 13, 2002 6:49 AM<BR>To:
si-list@xxxxxxxxxxxxx<BR>Subject: [SI-LIST] SPECCTRAQuest: DC level shift with
series
caps<BR><BR><BR><BR>Hi All,<BR><BR>I'm trying to use SigXplorer to simulate a
link with a
differential<BR>driver and series DC-blocking caps. Contrary to
expectations,<BR>single-ended P and N outputs measured at the load are not
centered<BR>around 0V DC, instead each one is given a separate DC shift. When
I<BR>remove
the series caps, the output is as expected - centered around
0V<BR>DC.<BR><BR>Does anybody
know what I can do to have the correct single-ended outputs<BR>with the series
caps?<BR><BR>Thanks.<BR><BR>Hassan.<BR>------------------------------------------------------------------<BR>To
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