Re: gEDA-user: ngspice - switched capacitors

[Stuart Brorson <sdb@xxxxxxxxxx>]

According to a widely available ngspice handbook available here:

http://www-ti.informatik.uni-tuebingen.de/~bernauer/lehre/ti-1-0506/spice/docu.html

you need to name the switch model SW, not VSWITCH.  Give the handbook
a read, it's not too bad.

Stuart


On Thu, 16 Nov 2006, nano schultz wrote:

> Hello,
>
> I'm trying to simulate a switched-capacitor model, but however ngspice
> can't recognize vswitch model. Or does ngspice have another name for
> it ?
>
> here is my spice file:
> SWCAP.CIR - SWITCHED-CAPACITOR RESISTOR
> *
> V1	1	0	DC	5V
> *
> * SWITCHES AND CAP
> S1A	1 2	10 0 	SW1
> C1	2	0	1000PF IC=0V
> S1B	2 3	11 0 	SW1
> *
> V2	3	0	DC	1V
>
> *
> * SWITCH CONTROL
> VSA	10	0	PULSE(0V 5V 0US 0.1US 0.1US 5US 20US)
> VSB	11	0	PULSE(0V 5V 10US 0.1US 0.1US 5US 20US)
> *
> .MODEL	SW1	VSWITCH(VOFF=0 VON=5 RON=100 ROFF=10MEG)
>
> *
> * ANALYSIS
> .TRAN 	0.1US  100US
> *
> * VIEW RESULTS
> .PROBE
> .END
>
> the erreur I'm getting with ngspice:
> [..]
> Circuit: SWCAP_RES.CIR - SWITCHED-CAPACITOR RESISTOR
>
> Error on line 6 : s1a   1 2     10 0    sw1
>        unable to find definition of model sw1 - default assumed
> Error on line 8 : s1b   2 3     11 0    sw1
>        unable to find definition of model sw1 - default assumed
> Error on line 17 : .model       sw1     vswitch(voff=0 von=5 ron=100 
> roff=10meg)
>       Unknown model type vswitch - ignored
>
> nano
>
>
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