Temperature and process compensation ring oscillator

Abstract

The invention discloses a temperature and process compensation ring oscillator. The temperature and process compensation ring oscillator comprises a ring oscillator and a compensation type bias circuit, wherein the ring oscillator comprises a plurality of a voltage-controlled delay unit and a gate controlled switch; the voltage-controlled delay unit constructs an annular delay line structure; the gate controlled switch is used for controlling the oscillation starting and oscillation stopping of the ring oscillator; the delay time of the voltage-controlled delay unit shows a positive temperature characteristic under the influences of process change and temperature drift, and is positively correlated with the voltage-controlled voltage; the compensation type bias circuit comprises a bias main body circuit and a compensation circuit, and is used for generating the voltage-controlled voltage which has a negative temperature characteristic and is correlated with the process change; and change in the delay time of the voltage-controlled delay unit caused by the process and temperature is compensated through the voltage-controlled voltage of the compensation type bias circuit. Compared with a conventional ring oscillator, the temperature and process compensation ring oscillator is simple in circuit structure and low in power consumption, is hardly influenced by the process change and temperature shift, and can meet the requirements on stable clock frequency in a temperature sensor and an infrared ranging 3D imaging readout circuit.

Description

technical field [0001] The invention relates to an oscillator, in particular to a temperature- and process-compensated ring oscillator. Background technique [0002] Oscillators, as clock generators and frequency generators, have become an integral part of most circuit systems and are widely used in communications, electronics, navigation, aviation, medicine, biology and other fields. The oscillator can output a signal that changes in a fixed period through self-excitation. It can be divided into a single-frequency triangle wave oscillator and a multi-spectrum harmonic oscillator according to the spectrum; it can be divided into whether it can be integrated or not. The oscillator can be integrated on-chip Oscillators and off-chip oscillators cannot be integrated. On-chip integrated oscillators can be divided into three types according to the topology: hysteresis oscillators, ring oscillators, and inductance-capacitor (LC) oscillators; while off-chip oscillators that cannot ...

AI Technical Summary

Problems solved by technology

[0003] At present, integrated oscillators are widely used in on-chip systems. Among them, hysteresis oscillators are mainly used to generate low-frequency clocks due to their low output frequency;...

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