Analog Operation Temperature Dependence of nMOS Junctionless Transistors Focusing on Harmonic Distortion

Abstract

This paper performs a comparative study of the analog performance of Junctionless Nanowire Transistors (JNTs) and classical Trigate inversion mode (IM) devices focusing on the harmonic distortion. The study has been carried out in the temperature range of 223 K up to 473 K. The non-linearity or harmonic distortion (HD) has been evaluated in terms of the total and the third order distortions (THD and HD3, respectively) at a fixed input bias and at a targeted output swing. Several parameters important for the HD evaluation have also been observed such as the transconductance to the drain current ratio (g_m/I_DS), the Early voltage (V_EA) and the intrinsic voltage gain (A_V). Trigate devices showed maximum A_V around room temperature whereas in JNTs the intrinsic voltage gain increases with the temperature. Due to the different A_V characteristics, Junctionless transistors present improved HD at higher temperatures whereas inversion mode Trigate devices show better HD properties at room temperature.When both devices are compared, Junctionless transistors present better THD and HD3 with respect to the IM Trigate devices.