Analytical Current Model for Long-Channel Junctionless Double-Gate MOSFETs

In this paper, a SPICE compatible analytical surface-potential-based model for junctionless symmetric double-gate (JLDG) MOSFETs is described. By using the gradual-channel-approximation, the 1-D Poisson's equation is solved to obtain the surface and central potential in the JLDG MOSFET for long channel case. A continuous drain current model with smooth transitions from fully depleted region to partially depleted and accumulation regions is then derived from the Pao-Sah's dual integral as a function of the surface and central potential at the source and drain terminals. The model is verified and validated by numerical simulations over a wide range of doping concentrations and device geometries. The model has been implemented in a circuit simulator and used to simulate some circuit building blocks without any convergent problem.