Sine Variable Resistor in LTspice

I'm trying to build a circuit in LTspice that includes a resistor varying as a sine function of time. I've read a few other posts about this but can't find a solution that works. Any help is appreciated. Thanks!

How to time vary a resistor in LTSpice

ademl said:

I'm trying to build a circuit in LTspice that includes a resistor varying as a sine function of time. I've read a few other posts about this but can't find a solution that works. Any help is appreciated. Thanks!

Click to expand...

Here you go!

Thanks! Works great.

Variable Capacitor, Similar Approach With a Twist

I had no luck making a varying capacitor with this exact approach but this post was a good starting point. What eventually did work for me was to use the charge based capacitor model. In place of a value like "100pF" put something like "Q=V(Cval)*x" where Cval is a signal name corresponding to the capacitor control value.

Borrowing directly from the LTSpice help file,
"There is a special variable, x, that means the voltage across the device. Therefore, a 100pF constant capacitance can be written as Cnnn n1 n2 Q=100p*x"