Introduction to SPICE models of variable/controllable capacitors and inductors

An intuitive explanation of the derivation of SPICE models for variable capacitors and inductors.

[liorziv]

Thank you very much !
I'm a graduated student from Ben Gurion university ( learned with Dr Mor Peretz ), and it helps at work :)
Looking forward for more videos !

[argargreg]

Brilliant, I needed that for work - thanks a lot!

[vbisbest]

I need this for a pressure sensor in a car. Is this available for purchase yet :)?

[jurajmarek]

Thanks for nice video and explanation. In literature I found this, but not with sufficient explanation.

For C=f(V) we use YX circuit and for L=f(V) or R=f(V) use ZX circuit
ZX:
* ports 1 and 2 are + and - input ports - control voltage
* ports 5 and 4 are + and - output ports of pseudo component
Eout 4 6 poly(2) (1, 2) (3, 0) 0 0 0 0 1
Fcopy 0 3 vsense 1
Rin 1 2 1G
Vsense 6 5 0
Lref 3 0 1uH ; reference inductance

YX:
* ports 1 and 2 are + and - input ports - control voltage
* ports 5 and 4 are + and - output ports of pseudo component
Ecopy 3 6 poly(2) (1, 2) (4, 5) 0 0 0 0 1
Fout 4 5 vsense 1
Rin 1 2 1G
Vsense 0 6 0
Cref 3 0 1n

from> SPICE A guide to Circuit simulation & Analysis Using SPICE, Paul W. Tuinenga