variable resistor in LTspice?

Status
Not open for further replies.
F

fanshuo

Full Member level 5
Joined
Jun 21, 2007
Messages
266
Helped
8
Reputation
16
Reaction score
4
Trophy points
1,298
Location
Netherlands
Activity points
2,746
ltspice variable resistor

how to create a variable resistor whose resistance could be changed in an arbitrary way, say sine wave, square wave and etc.


Thanks.
 

variable resistor ltspice

fanshuo said:
how to create a variable resistor whose resistance could be changed in an arbitrary way, say sine wave, square wave and etc.
Click to expand...

Here's an example. Let's say you want a resistor to vary its resistance sinusoidally between 500 ohms and 1500 ohms at a frequency of 1 Hz. All you do is add a resistor to the schematic as you would do normally but instead of specifying the resistor with a fixed value use this function instead:

R=1000+500*SIN(2*PI*TIME)

Look for .PARAM in the help topics for more functions you could try.

David
 

variable resistor in ltspice

I tried
.param RN=10+sin(400k*pi*time)
and I defined the value of the R1 is RN
the simulation shows warning that
"can't solve .param RN=10+sin(400k*pi*time)"


also I tried to set the resistor value directly as
sin(400k*pi*time)
then it react as"can not find the definition of model sin"


what should I do?
 

Status
Not open for further replies.

Similar threads

Menu
Log in
Register
Cookies are required to use this site. You must accept them to continue using the site. Learn more…