Re: gEDA-user: noise analysis in ngspice?

[Werner Hoch <werner.ho@xxxxxx>]

Hi Ron,

On Tuesday 21 February 2006 20:52, Ron Crummett wrote:
> We are learning noise analysis in my communications circuits class
> right now.  My instructor does simulations with WinSpice, but I try
> using ngspice to do them as well.  Up until now it's worked great,
> but noise analysis does not.  When I try to run a netlist that
> includes noise analysis parameters in WinSpice it works fine, but in
> ngspice I get errors, telling me "Noise input source Vac not found in
> circuit" and then aborts the noise simulation.  I have attached my
> netlist here for observation; what do I need to change?  Thanks.
>
> -Ron Crummett

---------------
werner@werner-amd64:~/daten> ngspice -b xx.cir 

Circuit: HW5_1.cir - EE 513, Assignment 5, Problem 1

Doing analysis at TEMP = 300.150000 and TNOM = 300.150000
Warning: vac: has no value, DC 0 assumed
         ^^^
ngspice lowercases the name of the voltage source

No. of Data Rows : 1
Doing analysis at TEMP = 300.150000 and TNOM = 300.150000
Warning: vac: has no value, DC 0 assumed
Warning: Noise input source Vac not in circuit
                            ^^^
But complains about an missing uppercase input source.

doAnalyses: not found

noise simulation(s) aborted
Note: No ".plot", ".print", or ".fourier" lines; no simulations run
---------------

If you write the source lowercase:
noise v(2) vac dec 20 10 10meg
           ^^^
it seams to work.

I'd say that is a bug in ngspice.

regards
Werner