A rf-low power 0.18 μm CMOS based differential ring oscillator

The paper present the design of oscillator in general using ring oscillator for analysis of a low power voltage controlled ring oscillator, wide range of frequency and low phase noise analysis, as a main 3 objective of this paper. This work has been implemented using gateway simucad empowering using silvaco eda tool software, this circuit also implements in 0.18μm technology. The design is based on 3 stages of the ring oscillator due to modification of improvement control voltage source(Vctrl) and tail current (Vtail). A tail current improvement is responsible to control the charging and discharging time of oscillator. Diffrential delay cell stages improvement are functionally as a noise reduction.The output of frequency is in between 0.73GHz and 3.52GHz with control voltage of 1V to 1.8V. The phase noise simulation result is-90.15dBc/Hz and the circuit drawn 6.59mW of power at Vtail=Vctrl=1V and the circuit drawn7.61mW of power at Vtail=Vctrl=1.8.