Re: gEDA-user: Phase and Magnitude of Current

[John Doty <jpd@xxxxxxxxx>]

On Apr 10, 2009, at 11:04 AM, awchang2@xxxxxxxxxxx wrote:

> Hi,
>
> I have this assignment for a circuit analysis class. We're supposed  
> to use pspice, but I'm having a couple of problems using the software.
>
> We're supposed to find the magnitude and phase of I, I_C, and I_L.  
> So I loaded up my netlist into ngspice, and I performed a transient  
> analysis with a step size of 5 ns and a duration of 200 ns:
>
> ngspice -> tran 5ns 200ns

While it is possible to use transient analysis for this purpose, AC  
analysis is easier for a linear circuit like this.

>
> It gave me the voltage, which is good and all, but how do I get the  
> magnitude and phase of the current without doing it by hand

There's a trick: in SPICE, a voltage source of zero volts functions  
as a current meter.

> (i.e. only using ngspice)? Attached is a picture of the schematic  
> (if that's necessary).
>
> Best regards,
> Albert Chang<spice.png>
>
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John Doty              Noqsi Aerospace, Ltd.
http://www.noqsi.com/
jpd@xxxxxxxxx




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