How to separate the source and the measured current

[SergioSobreira]

Hi Everybody,

I'd like to know if there is some way to separate the source and the measured current and just writte an mathematical expression to make a dependence between the source and the said parameter. Thanks in advance.

[Abel_Souza]

Hello Sergio Sobrera,

Can you explain better your doubt?

regards,

[SergioSobreira]

Sure,

Here is the deal:

I'd like to build a circuit with dependent sources, but instead of connecting the sense of current/voltage, I'd like to know if there is a way to writte a sentence for the source which is dependent of a parameter.

For example:

In this circuit I just wrote an expression for the source and its respective parameter. (8*Io).

[johnsold]

Typically Spice simulators handle that situation by placing a zero voltage independent source in series with the 5 ohm resistor. The current through that source then becomes the controlling current for the dependent source. If you need a more complicated expression than a constant multiplier, look at the non-linear dependent sources (B devices in Spice 3).

Lynn