[eispice] behavior test case problems

  I've tried a couple of behavior cases that don't seem to run. I hope I 
haven't abused the capability. I'm simply seeing if a mos divider circuit 
will work. I have two devices and behavioral nmos and pmos with the gate, 
drain of both the pmos and nmos tied together. I have tried three different 
cases. Let me know what you think.

#!/usr/bin/python

from eispice import *

# -- PyB Defined Model --
class pmos_sat(dev.PyB):

  def __init__(self, p, n, g,  s, b, kp=2e-6,wp=2,lp=1,power=2.0):
    dev.PyB.__init__(self, p, n, Current, v(g), v(s), v(b))
    self.kp = kp
    self.wp = wp
    self.lp = lp
    self.vtp= 0.7
    self.betap = kp*wp/lp
    self.power=power
  def model(self, Vg, Vs):
    if ((Vs - Vg)> self.vtp):
      return 0.5*self.betap*(Vs - Vg - self.vtp)**self.power
    else :
      return 0
class nmos_sat(dev.PyB):

  def __init__(self, p, n, g,  s, b, kn=5e-6,wn=2,ln=1,power=2.0):
    dev.PyB.__init__(self, p, n, Current, v(g), v(s), v(b))
    self.kn = kn
    self.wn = wn
    self.ln = ln
    self.vtn= 0.7
    self.betan = kn*wn/ln
    self.power=power
  def model(self, Vg, Vs):
    if ((Vg - Vs)> self.vtp):
      return 0.5*self.betan*(Vg - Vs - self.vtn)**self.power
    else :
      return 0

# Now to use the model
kp = 2e-6
wp = 2
lp = 1
vtp= 0.7
betap = kp*wp/lp
power=2
kn = 5e-6
wn = 2
ln = 1
vtn= 0.7
betan = kn*wn/ln

d = Deck('PyB Defined Behavioral MOS divider')

d.V0 = dev.V(1, GND, 3.3)
#d.pmosx = pmos_sat(4, GND, 4, 1, 1)
#d.pmosx = dev.B('4', GND, 'i',"0.5*betap*(v(1,4)-vtp)^2")
d.pmosx = dev.B('4', GND, 'i',"0.5*2e-6*(v(1,4)-0.7)^2")
#d.nmosx = nmos_sat(4, GND, 4, GND, GND)
#d.nmosx = dev.B(4, GND, 'i',"0.5*betan*(v(4,GND)-vtn)^2")
d.nmosx = dev.B(4, GND, 'i',"0.5*5e-6*(v(4,GND)-0.7)^2")
d.rout = dev.R(4,GND, 100000)

d.op()

d.plot()

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