Abstract: The bipolar theory of fieldeffect transistor is introduced to replace the 55-year-old classic unipolar theory invented by Shockley in 1952 in order to account for the characteristics observed in recent double-gate nanometer silicon MOS field-effect transistors.Two electron and two hole surface channels are simultaneously present in all channel current ranges.Output and transfer characteristics are computed over practical base and gate oxide thicknesses.The bipolar theory corroborates well with experimental data reported recently for FinFETs with metal/silicon and p/n junction source/drain contacts.Singledevice realization of CMOS inverter and SRAM memory circuit functions are recognized.

Key words: unipolar FET theory, bipolar FET theory, simultaneous hole and electron surface channels, volume channel, double-gate, pure-base