Design of a CMOS Voltage-Controlled Ring Oscillator with Bandgap Voltage Reference

Abstract

Voltage controlled oscillator has been used in every field of the electronics industry, and plays an indispensable role. In the fractional divider, in order to reduce the product size, voltage controlled ring oscillator is used to meet the design requirements, at the same time as much as possible to reduce the area. The design of wide tuning voltage-controlled ring oscillator was designed with the reference voltage source. This design not only could reduce the error brought by the external voltage reference, and was also very good realization structure innovation in the film. This design used 0.5 μ m CMOS Hua technology. The post simulation results show: when the coarse voltage and fine voltage are respectively 1V and 2V, voltage waveform oscillator output swing is 2.4V; when the coarse voltage and fine voltage are respectively 1.13V and 2V, voltage waveform oscillator output swing is 2.8V; when the coarse voltage and fine voltage are respectively 1.3V and 2V, voltage waveform oscillator output swing is 3V. After simulations, the frequency range of the voltage-controlled ring oscillator adjustment is 100 ~ 200MHz.