RESOLVED: Looking for Dual Gate MOSFET Vgs vs. Id equations

I'm looking for the equation which relates Vgs1, Vth1, Vgs2, and Vth2 to Id.

For a single gate MOSFET, this is:

or the approximation

where

I haven"t found much about how to apply this to dual gate MOSFETs, however.

For anyone who was curious about the answer to this question, I went to a professor at my university and asked him. Turns out that the answer is much simpler than I expected. A dual gate mosfet is modeled as two MOS transistors, connected source-to-drain.

In effect, a dual gate mosfet is a single-element cascode amplifier.

Cheers,
Annirak