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Dynamic temperature correction oscillation circuit

A technology of oscillating circuit and dynamic temperature, applied in power oscillators, electrical components, etc., can solve problems such as poor user experience and failure to provide

Active Publication Date: 2019-04-05
CHIPSEA TECH SHENZHEN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a dynamic temperature correction oscillator circuit, which aims to solve the problem that the clock frequency in a dynamic temperature environment cannot It is greatly affected by temperature changes and the user experience is not good

Method used

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  • Dynamic temperature correction oscillation circuit

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Embodiment 1

[0019] figure 1 The structure of the oscillator circuit for dynamic temperature correction provided by Embodiment 1 of the present invention is shown. For the convenience of description, only the parts related to the embodiment of the present invention are shown, and the details are as follows:

[0020] In the embodiment of the present invention, the oscillating circuit for dynamic temperature correction includes an oscillating circuit and a dynamic temperature correction circuit. The oscillating circuit includes a capacitor circuit K that generates an oscillating current. The lower stage of the capacitor circuit K is connected with a compensation circuit that compensates the temperature characteristics of the clock frequency. Circuit M; the dynamic temperature correction circuit includes a temperature sensor TempSensor, reads the current ambient temperature through the temperature sensor TempSensor, and corrects the temperature characteristics of the clock frequency; the oscil...

Embodiment 2

[0026] figure 1 The structure of the oscillation circuit for dynamic temperature correction provided by the second embodiment of the present invention is shown. For the convenience of description, only the parts related to the embodiment of the present invention are shown, and the details are as follows:

[0027] In the embodiment of the present invention, the oscillating circuit includes a voltage stabilizing circuit LDO, which stabilizes the power supply voltage VDD and outputs the VLDO to provide a stable working voltage for the core components of the oscillating circuit, eliminating the influence of the power supply voltage on the clock frequency. The current I1 generates a reference voltage VREF on the pull-down resistor R, which is connected to the positive input terminal of the comparator COMP, the reference voltage VREF=I1*R, and the current I2 provides the charging / discharging current to the capacitor circuit K, and the capacitor circuit K is connected to the negative ...

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Abstract

The invention provides a dynamic temperature correction oscillation circuit which is suitable for the semiconductor technology field. The circuit comprises the oscillation circuit and a dynamic temperature correction circuit. The oscillation circuit comprises a capacitance circuit. The lower stage of the capacitance circuit is connected to a compensation circuit compensating the temperature characteristic of a clock frequency. The compensation circuit can change the charging interval of the capacitance circuit with the change of a temperature and then influence charging time so as to compensate a logic gate delay problem caused by a temperature change by using a charging time change caused by the capacitance circuit. Further, a current ambient temperature is read through a temperature sensor in the dynamic temperature correction circuit, the temperature characteristic of the clock frequency is corrected according to the current ambient temperature and the stability of the clock frequency along with temperature changes is improved. The oscillation circuit working in the dynamic temperature environment is corrected, the operation of the oscillation circuit is more stable and applicability is wide.

Description

technical field [0001] The invention belongs to the technical field of semiconductors, in particular to an oscillation circuit for dynamic temperature correction. Background technique [0002] In large-scale integrated circuits, the clock signal is a very important part of many electronic systems. The clock signal is usually generated by an oscillator. The RC oscillator is the most commonly used oscillator circuit. Its structure is simple and can be integrated. high and low cost. [0003] However, the RC oscillator is greatly affected by the change of the working voltage and temperature, the process correlation is relatively poor, and the accuracy is poor, and its error is generally in the range of 2% to 10%. [0004] The performance of the oscillator plays a vital role in the performance of the entire system. As the requirements for clock frequency accuracy and temperature coefficient become more and more stringent, the traditional RC oscillator can no longer meet the requ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03B5/04H03B5/12
CPCH03B5/04H03B5/1228
Inventor 陈培腾陈敏
Owner CHIPSEA TECH SHENZHEN CO LTD