Dependent sources circuit: need help

[pat666]

Hey,

I have a circuit analysis assignment due, I've done the work by hand but I want to use multisim to check my solutions. Can someone give me some hints as to how to put in the dependent sources shown in the attached circuit.

Thanks

[_user32]

pat666,

I believe you need to have either a ABM Voltage Source (Analog Behavioral Model) or you could use a Current Controlled Voltage Source and Voltage Controlled Voltage Source respectively.    In the database go to the Sources group -> CONTROLLED_VOLTAGE_SOURCES and this should allow you to do what is described in the schematic at those designated nodes.

Regards,

Pat Noonan

National Instruments

[Tang_Lihua]

Hi, _user32

seems that ABM_voltage source does not accept the expression with current, only voltage variable, is it?

Best,

[Tayyab_R]

Hi,

There is a component called ABM_CURRENT under the CONTROLLED_CURRENT_SOURCES Family. You can use this for current.

Hope this helps.

[Tang_Lihua]

Dear Tayyab R

I need a voltage Source having V-I relation as:

V=-0.0202*I+0.1502*I^3, where I is the current through the source itself.

Below is what I modeled in Simetrix, could I implement this in multisim as well？

[johnsold]

Tang_Lihua,

I do not have Multisim but in Spice 3 that can be modeled with a linear independent voltage source (V1) set to 0 and a non-linear dependent source B.

V1 is used to measure the current.  A transient analysis with the UIC option shows a sine wave at about 7 kHz in the circuit listed below. To do an AC analysis, a non-zero value of AC must be entered for V1 or some other source.

Test Arb source

V1 1 2 DC 0 AC 0
B 0 1 V=-0.0202*I(V1)+0.1502*I(V1)^3
Rx 2 0 1G
L1 2 3 20m
C1 3 4 20m IC=100u
R1 4 5 10m
C2 5 0 25n
R2 5 0 1G

.END

In the lower image the x-ais should be Frequency, not Time.

Lynn

[Tang_Lihua]

Dear Lynn

thanks for your reply.

the response of voltage across capacitor should be like 

Does spice 3 have any user interface? I need to add more advanced components.

[johnsold]

Tang_Lihua,

I suspected that the envelope should not be constant but did not take the time to pursue the reason.  

The version of Spice that I use is a port of the Berkeley code to the Macintosh called MacSpice. It uses a command line interface.  It does not have any schematic capture or even a text editor.  It can plot results, but I export the data and plot it in a LabVIEW program I am developing so that I have more control over the plotting.

Lynn

[Tang_Lihua]

Dear lynn

thanks anyway.