NMOS inverting amp with negative VDD?

[Chad1]

Hi guys,

I'm trying to design a circuit using only an N-FET and a resistor that performs with the basic inverting amp characteristics, but I want it to work with both a + and - VDD. Any suggestions? I'm sure this spec will require more components than an N-FET and a resistor. I tried to come up with a circuit that introduces a diode in series with GND so that when Vin (gate) is pulled low, Vout is VDD (where VDD<0). Below is a truth table of what I want (the last line is the only one that is a problem):

Vin (VDD>0)      Vin (VDD<0)         Vout
------------------------------------------------------
  high                                               0
  low                                              VDD (>0)
                             high                    0
                             low                   VDD (<0)



                 VDD
                   |
                   |
                   /
                   \
                   /
              R   \
                   |
                   |
             -----o----------o Vout
Vin ----|
             -----|
                   |
                   |
                 GND



Thanks a lot!