A Circuit Design of a Ring Oscillator Insensitive to Temperature

Abstract

The invention discloses a design of a circuit of an annular oscillator insensitive to temperature. The circuit consists of a temperature sensor, a temperature adaption module, a reduction circuit and an oscillation loop, wherein the temperature sensor is used for inputting a direct-current stable voltage (can be bandgap reference voltage BG); output voltage changes linearly along with temperature; the temperature adaption module can be used for adjusting the slope of a curve obtained by the temperature sensor into a required value; and the reduction circuit is used for further adjusting the intercept of the curve. Through the curve which indicates the change of voltage along with temperature obtained in the way, the oscillation loop can obtain stable output frequency in a permissible error range. Due to the design disclosed by the invention, the stability of the circuit of the annular oscillator can be better improved, and the practicability and effect of the annular oscillator are improved. The circuit is constructed by using a CMOS (Complementary Metal-Oxide-Semiconductor Transistor) device, so that the circuit is simple in design, and is low in manufacturing cost.

Description

technical field [0001] The invention belongs to the field of integrated circuit design, and in particular relates to a circuit design of a temperature-insensitive ring oscillator. Background technique [0002] Ring oscillators are widely used, and there are many structures of ring oscillators, and more and more people pay more and more attention to the realized functions. Ring oscillators are an essential part of most electronic systems, and one of the core components of wireless communication systems. They have always played an important role in the fields of communication, electronics, navigation, aviation, and medical equipment and instrumentation. For example, in radio measuring instruments, ring oscillators can generate sinusoidal signal voltages in various frequency bands; in heat treatment, heat processing, ultrasonic processing and some medical equipment, ring oscillators can generate large frequency high-frequency currents to heat the load . In people's daily life...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that the stability of the ring oscillator is affected by temperature, and propose a circuit design of a temperature-insensitive ring oscillator, which has a simple structure and utilizes a temperature sensor, a temperature adaptive module and subtraction circuit to reduce the sensitivity of the output frequency of the ring oscillator to temperature, and improve the output stability of the ring oscillator from the aspect of new circuit structure

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