Steve,
Does anyone have a model for a voltage controlled resistor?
With a current version of LTspice, you can just
replace the value of the resistor with an
equation of the form R=<expression>.
Here's a netlist that gives an example:
* Intrinsic arbitrary resistor
V1 x 0 sine(1 .1 1K)
R1 1 0 R=3K*V(x)
I1 0 1 1m
.tran 3m
.end
The underlying implementation is a Norton
equivalent circuit, so you might need to be
careful that the resistance doesn't go
through zero.
--Mike
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Mike Engelhardt