LTSpice question, dependent sources.

[Redbelly98]

I use LTSpice, and vaguely remember there was a way to make a voltage (or current) source depend on either another source in the circuit, or to follow some function of time. I think it's either a source parameter, or a command line placed in the schematic.

Does anybody know how to do this? I tried searching the LTSpice Yahoo group but didn't find what I'm after.

TIA,

RB

FYI, I am trying to model the behavior of a NiCd battery in a charger. I have an equation for battery voltage vs. charge state.

 

[Mike_In_Plano]

Hello Redbelly,

Sure enough, there are three basic dependent sources:

1. e - Has two inputs and two outputs. Open the symbol and put a gain value in for value 1
2. bv - Arbitrary voltage source. Open the symbol and type V=v(node) into value, it will output the voltage at [node]. Likewise, you can make it current dependent by entering V=i(part)
3. bi - Arbitrary current source. Open the symbol and type I=v(node) or I=i(part) into value.

Mike

 

[Redbelly98]

Thanks Mike! And I see that bv and bi can be defined with any arbitrary function, which is just what I need.

Thanks again,

Mark