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Frequency control method and circuit of a ring oscillator

A ring oscillator and circuit technology, applied in the direction of automatic power control, electrical components, output stability, etc., can solve the problem of low output frequency accuracy, and achieve the effect of compensating for influence, providing stability, and avoiding the influence of output frequency.

Active Publication Date: 2018-02-23
STATE GRID CORP OF CHINA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The invention provides a frequency control method and circuit of a ring oscillator, which is used to solve the problems of low output frequency precision existing in the existing ring oscillator

Method used

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  • Frequency control method and circuit of a ring oscillator
  • Frequency control method and circuit of a ring oscillator
  • Frequency control method and circuit of a ring oscillator

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Experimental program
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Effect test

Embodiment 1

[0038] This embodiment provides a frequency control method for a ring oscillator. The flow chart of the method in this embodiment is as follows figure 1 As shown, the method includes the following steps:

[0039] S1: Obtain a current with a positive temperature coefficient through the current bias circuit;

[0040] S2: using a current with a positive temperature coefficient to obtain a voltage with a positive temperature coefficient that is proportional to the current with a positive temperature coefficient;

[0041] S3: Apply a voltage with a positive temperature coefficient to the ring oscillator to obtain a stable output frequency.

[0042] In this embodiment, the current with a positive temperature coefficient is generated by the current bias circuit, and then the voltage with a positive temperature coefficient is obtained. By setting the device parameters, the output frequency of the ring oscillator can not be affected by the temperature, which greatly provides The stab...

Embodiment 2

[0049] This embodiment and Embodiment 1 belong to the same inventive concept, and this embodiment provides a frequency control circuit for a ring oscillator, which includes:

[0050] a current bias circuit for obtaining a current with a positive temperature coefficient;

[0051] A voltage generating circuit; used to obtain a voltage with a positive temperature coefficient that is proportional to a current with a positive temperature coefficient by using a current with a positive temperature coefficient;

[0052] Ring Oscillator for a stable output frequency using a voltage with a positive temperature coefficient.

[0053] Among them, the current bias circuit includes:

[0054] a first current mirror circuit, a second current mirror circuit and a first resistor R1;

[0055] The first current mirror circuit comprises a first transistor MP1 and a second transistor MP2; the source of the first transistor MP1 and the source of the second transistor MP2 are respectively connected ...

Embodiment 3

[0063] This embodiment describes the present invention in detail through an actual scene. The schematic diagram of the ring oscillator frequency control circuit of this embodiment is as follows figure 2 shown.

[0064] This embodiment includes a PTAT (proportional to absolute temperature, proportional to absolute temperature) current bias generating circuit (corresponding to the above-mentioned current bias circuit), ring oscillator control voltage VOSC (V represents voltage; OSC is oscillator, oscillator ) generating circuit (corresponding to the above-mentioned voltage generating circuit) and a ring oscillator in three parts. Wherein, the ring oscillator stage includes K-level CMOS inverters (K>=3, an odd number). figure 2 A circuit diagram of a K-class ring oscillator is given in .

[0065] The current bias generating circuit is composed of a first transistor MP1, a second transistor MP2, a third transistor MN1, a fourth transistor MN2 and a first resistor R1. The gat...

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Abstract

Provided are a frequency control method and circuit for a ring oscillator. The method comprises the following steps: obtaining, by means of a current bias circuit, a current having a positive temperature coefficient; using the current having the positive temperature coefficient to obtain a voltage having a positive temperature coefficient that is in set proportion to the current having the positive temperature coefficient; and applying the voltage having the positive temperature coefficient to a ring oscillator to obtain a stable output frequency. The method prevents the output frequency of the ring oscillator from being affected by temperature, and greatly improves stability of the output frequency. The method prevents an external power source from affecting the output frequency of the ring oscillator, and provides a good power supply rejection ratio. When each component of the current bias circuit, a voltage generation circuit and the ring oscillator is manufactured by the same process, the change of a threshold voltage of each component with temperature is identical, and the influence of the manufacturing process to the output frequency of the ring oscillator can be compensated.

Description

technical field [0001] The present invention relates to the technical field of control circuits, in particular to a frequency control method and circuit of a ring oscillator. Background technique [0002] The clock circuit is an essential module in modern chip systems, providing accurate clocks for the system. The implementation of the clock circuit mainly includes crystal oscillator, phase-locked loop clock circuit, relaxation oscillator, ring oscillator and so on. Due to its simple structure and low power consumption, the ring oscillator has been widely used in occasions where the frequency accuracy is not high. However, ordinary ring oscillators are greatly affected by external factors such as power supply and ambient temperature, and are also greatly affected by manufacturing processes. Therefore, the output frequency accuracy of ordinary ring oscillators is poor, which affects the performance of the chip system. [0003] Currently, there are many schemes to optimize t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03L7/099
CPCH03L1/02
Inventor 李振国原义栋胡毅杨小坤王敏马永旺
Owner STATE GRID CORP OF CHINA