[SI-LIST] Re: Hspice related question
- From: Yu Liu <yu_liu@xxxxxxxxxxxxx>
- To: rplantsprint@xxxxxxxxxxxxx
- Date: Mon, 12 May 2003 15:11:53 -0700
Hello, Drew,
An ideal voltage source can give/sink any current. Likewise, voltage
across an ideal current source can be any value. So it is perfectly
valid for a paralleled Vsrc and Isrc, that Vsrc's current is zero all
the time, while voltage across Isrc equals Vsrc's. Secondly, it is not
clear what the original poster's intent. A G-element can be used to
model either a real source, or a device (e.g. a diode). To answer the
pure syntax question, it would be
gxxx 1 2 cur='sin(v(1)-v(2))'
in NSpice. I'm not sure what Spectre's syntaxt is, though. However, it
should be emphasized that controlling nodes are the same as the VCCS
nodes is perfectly legal and should NOT a problem for any simulator.
Regards,
Yu
===
Drew Plant wrote:
>Hello Shalini,
>
>You're describing placing a V-source in parallel with an I-source. I don't
>know if
>this is what you want, because the V-source (unless you specify a non-zero
>output impedance) will effectively suck up all of the current from the
>I-source,
>and the net current going out of or into nodes 1 and 2 will be determined by
>the rest
>of the circuit hooked up to these nodes, not the V-controlled I-source.
>
>Regards,
>Drew
>
>-----Original Message-----
>From: si-list-bounce@xxxxxxxxxxxxx
>[mailto:si-list-bounce@xxxxxxxxxxxxx]On Behalf Of shalini gautam
>Sent: Sunday, May 11, 2003 2:09 AM
>To: si-list@xxxxxxxxxxxxx
>Subject: [SI-LIST] Hspice related question
>
>
>
>
>
> I have to model a voltage
>controlled current source, problem is that the
> controlling node is the same as
>the node across which this VCCS is
> connected something like this. [
>it's a kind of non-linear resistor too.]
>
> GXXX 1 2 1 2
>value{sin(v(1)-v(2)}
>
> but somehow this sentence gives
>syntax error.
> I am simulating in spectreS
>(similar as hspice) environment.
>
> Any clue why this shows syntax
>error.
>
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