The Design Of The Ring Oscillator With The Temperature And Process Compensation

The oscillator is indispensable in the electric circuit and system. The oscillator has acted as an important role in communication, electronics, navigation, aviation and medical equipment since it was born. With the development of the process of the integrated circuit, there are a lot of new structures of the oscillator, which supply precious experience for the circuit designers while satisfy the different requirements for their systems.This paper focuses on the study and design of the temperature and process compensation of the ring oscillator. The ring oscillator consists of five modules, which includes the band gap reference module, the temperature and process compensation module, the bias module, the differential input/output delay module and the comparator module. The band gap reference module provides voltage for the entire circuit, which could improves the Power Supply Rejection Ratio of the circuit. The temperature and process compensation module generates the control voltage, realizing the high precise compensation of the temperature and process. The bias module provides the bias voltage, controlling the swing of the differential delay. The differential input/output delay module composes three differential delay units, which reduces the noise of the circuit and increases the structure flexibility. The comparator module realizes the digital compatible output of the circuit, which consists of the inverter with process compensation to reduce the process effects. The layout is. designed by the soft of virtuoso.The ring oscillator circuit is designed and validated by soft of Cadence in Linux, basing on TSMC0.13um CMOS technology library. The design of100MHz clock signal output with the temperature and process compensation is realized by simulation. During all kinds of process corners, when the temperature is various from40℃to125℃, the variation of the center frequency of the output is less than15%, which satisfies the design requirement. Finally, the design of the layout is implemented by the software of Virtuoso in Linux with TSMC0.13μm CMOS process.