Ring Oscillator Based on R-NMOS Logic with Back-Gate Control

This paper presents a low-voltage, differential RC-ring oscillator for wireless communication systems, designed in a standard triple-well 90nm CMOS technology. This is a two-stage R-NMOS (resistor-NMOS logic) ring VCO. The oscillation frequency can be controlled from the DC voltage sources: the back-gate biasing voltage V
_Bulk
and/or the power supply V
_DD
. The simulation results show a maximum oscillation frequency of 17GHz