mcalc.pxe is used to characterize a mos device for gm/I design

It is developed to be run with LTSpice, and does not use and internal
model stuff.

So far we use :

* gregGMnmos and gregGMpmos to do the Id sweeps to get gm and gds

  These sweeps have five identical devices to get the derivatives
  The voltage deltas can be passed to mcalc.pxe 

* gregGMncap to get the capacitance (need gregGMpcap)

  An estimate of the gate cap per square micron can be passed to mcalc.pxe
  so that the resonance frequency with the inductor can be set to
  10 kHz and the current can be set to 0dB gain at 1GHz

  You should check the .op.raw file to verify that the DC currents are correct

* Need a gregGMnvt and gregGMpvt

  These bias up a device Vgs=vdd vds=vdd/2 then mirror that current
  by a factor of alph=1/100