[SI-LIST] Re: PSPICE AC Sweep
- From: "Thomas Beneken" <beneken@xxxxxxxxxxxx>
- To: "'Michael Smith'" <michael@xxxxxxxxxx>, <si-list@xxxxxxxxxxxxx>
- Date: Tue, 18 Nov 2003 16:41:00 +0100
Hi Michael,
here's the simulation netlist of a lossy transmission line - enhanced with
losses going with the square root of frequency (which is much more realistic
...).
R_R2 $N_0001 0 50
V_V1 $N_0002 0 DC 0V AC 2V
R_R1 $N_0003 $N_0002 50
T_T3 $N_0003 0 $N_0001 0 LEN=100 R={SQRT(s/w0)} L=250nH G=10uS
C=100pF
The resistors R1/2 terminate input and output of the lossy transmission line
T3. The line is driven by V1. The interesting parameter of T3 is
R={SQRT(s/w0)} which models skin effekt losses proportional to sqare root of
frequency f. s is the Laplace parameter j*omega. j = imaginary unit, omega =
2*Pi*f
Hope this can help as a starting point for your own experiments.
Thomas
> -----Original Message-----
> From: Michael Smith [mailto:michael@xxxxxxxxxx]
> Sent: Monday, November 17, 2003 9:19 PM
> To: beneken@xxxxxxxxxxxx
> Subject: RE: [SI-LIST] Re: PSPICE AC Sweep
>
>
> Hi Thomas,
>
> I'm trying to build a resistor that varies its value as the SQRT of
> frequency. Were you able to use the f variable as a parameter in the
> definition of part values?
>
> For example:
>
> .PARAM RV1 = {100*f}
> R1 1 2 {RV1}
>
> ORCAD PSPICE is based on Microsim PSPICE; was the variable
> you used {f}?
> It seems to be undefined in my version of PSPICE.
>
> Thanks for your help,
>
> Michael Smith
> iZ Technology Corp.
> Voice: (604) 395-7878 ext. 314
> Fax: (604) 395-7888
>
>
> -----Original Message-----
> From: si-list-bounce@xxxxxxxxxxxxx
[mailto:si-list-bounce@xxxxxxxxxxxxx]
On Behalf Of Thomas Beneken
Sent: Monday, November 17, 2003 3:05 AM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: PSPICE AC Sweep
Michael,
with Microsim PSPICE You can use f for Frequency and s for Laplace
parameter.
I successfully modelled frequency dependend loss of communication
cables.
Thomas
> -----Original Message-----
> Message: 7
> Date: Fri, 14 Nov 2003 15:37:14 -0800
> From: "Michael Smith" <michael@xxxxxxxxxx>
> Subject: PSPICE AC Sweep
>
> Hi,
>
> Does anyone know if the frequency variable is available to use in
> component value expressions during AC sweeps in PSPICE?
>
> Thanks,
>
> Michael Smith
> iZ Technology Corp.
> Voice: (604) 395-7878 ext. 314
> Fax: (604) 395-7888
>
>
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