A four-transistor Schmitt trigger inverter is provided. The Schmitt
trigger inverter is made from an n-channel MOS (NMOS) dual-gate thin-film
transistor (DG-TFT) and a p-channel MOS (PMOS) DG-TFT, both DG-TFTs
having a top gate, a back gate, and source/drain regions. A
(conventional) NMOS TFT has a gate connected to an NMOS DG-TFT first S/D
region and a PMOS DG-TFT first S/D region. The NMOS TFT also has a first
S/D region connected to the NMOS DG-TFT back gate and the PMOS DG-TFT
back gate. A (conventional) PMOS TFT has a gate connected to the NMOS TFT
gate, and a first S/D region connected to the NMOS TFT first S/D region.