CN103281055B - Rc oscillator - Google Patents
Rc oscillator Download PDFInfo
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- CN103281055B CN103281055B CN201310157715.3A CN201310157715A CN103281055B CN 103281055 B CN103281055 B CN 103281055B CN 201310157715 A CN201310157715 A CN 201310157715A CN 103281055 B CN103281055 B CN 103281055B
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Abstract
The open a kind of RC oscillator of the present invention, this RC oscillator include producing the clock module of frequency of oscillation, in real time detection clock module temperature temperature detecting module, the temperature detected by temperature detecting module and the temperature value preset are analyzed and send the processing module of analysis result and receives analysis result after, choose default frequency according to analysis result trim value and trim, according to the frequency chosen, the adjusting module that the output frequency of clock module is regulated by value accordingly, wherein, clock module has a control end；The output of temperature detecting module is connected with the input of processing module；The output of processing module is connected with the input of adjusting module；The output of adjusting module is connected with the control end of clock module.The present invention can solve the frequency of oscillation of RC oscillator in prior art and be vulnerable to external environment influence and make the unstable problem of output frequency, improves the rate-adaptive pacemaker precision of RC oscillator.
Description
Technical Field
The invention relates to the technical field of electronic circuits, in particular to an RC oscillator.
Background
Oscillators (oscillators) are electronic components that produce a repetitive electrical signal, usually a sine wave or a square wave. The circuit formed by the circuit is called an oscillating circuit. An electronic circuit or device capable of converting direct current into alternating current signals with certain frequency and outputting the alternating current signals. The device has a plurality of types, and can be divided into a self-excited oscillator and an independent-excited oscillator according to an oscillation excitation mode; the circuit can be divided into a resistance-capacitance oscillator, an inductance-capacitance oscillator, a crystal oscillator, a tuning fork oscillator and the like according to the circuit structure; the oscillator can be divided into sine wave, square wave, sawtooth wave and other oscillators according to the output waveform.
At present, oscillators are widely applied to the aspects of electronics, industry, medical treatment, scientific research and the like, and the oscillation frequency of an RC oscillator with a traditional structure is easily influenced by voltage fluctuation of an external power supply, temperature change or process deviation, so that the output frequency of the RC oscillator is very unstable, and great inconvenience is brought to the production and life of people.
Disclosure of Invention
The invention mainly aims to provide an RC oscillator, aiming at enhancing the anti-interference capability of the RC oscillator and improving the accuracy of the output frequency of the RC oscillator.
In order to achieve the above object, the present invention provides an RC oscillator, including: still include temperature detect module, processing module and adjustment module, the clock module has power input end and control end, the output of temperature detect module is connected with processing module's input, processing module's output is connected with adjustment module's input, adjustment module's output is connected with clock module's control end, wherein:
the temperature detection module is used for detecting the temperature of the clock module in real time;
the processing module is used for analyzing the temperature detected by the temperature detection module and a preset temperature value and sending an analysis result to the adjustment module;
and the adjusting module is used for selecting a preset frequency trimming value according to the analysis result and correspondingly adjusting the output frequency of the clock module according to the selected frequency trimming value after receiving the analysis result.
Preferably, the processing module is an arithmetic unit, and the arithmetic unit is configured to perform subtraction calculation on the temperature detected by the temperature detection module and a preset temperature value, and send a calculation result to the adjustment module.
Preferably, the processing module is a comparing unit, and the comparing unit is configured to compare the temperature detected by the temperature detecting module with a preset temperature value, and send a comparison result to the adjusting module.
Preferably, the clock module is an integrated chip, and the temperature detection module includes a temperature sensor attached to or disposed inside the integrated chip.
Preferably, the clock module is a clock circuit.
Preferably, the clock module further comprises a direct current stabilized power supply for providing stable voltage for the clock module; the clock module is also provided with a power supply input end, and the power supply output end of the direct current stabilized power supply is connected with the power supply input end of the clock module.
Preferably, the regulated power supply is an LDO low voltage regulator.
Preferably, the device further comprises a voltage detection module for detecting the power supply voltage of the clock module in real time; the clock module is also provided with a measured voltage end, and the detection end of the voltage detection module is connected with the measured voltage end of the clock module.
Preferably, the voltage detection module is an RC oscillator power supply voltage detection circuit.
The RC oscillator provided by the invention detects the temperature of the clock module in real time through the temperature detection module, the processing module analyzes the temperature detected by the temperature detection module and a preset temperature value and sends an analysis result to the adjustment module, and after the adjustment module receives the analysis result, the adjustment module selects a preset frequency trimming value according to the analysis result and correspondingly adjusts the output frequency of the clock module according to the selected frequency trimming value, so that the influence of the external environment (such as temperature) on the frequency output of the RC oscillator is reduced, and the frequency output precision of the RC oscillator is ensured.
Drawings
FIG. 1 is a block diagram of an embodiment of an RC oscillator according to the present invention;
FIG. 2 is a block diagram of another embodiment of an RC oscillator according to the present invention;
fig. 3 is a block diagram of a structure of another embodiment of the RC oscillator of the present invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
The technical scheme of the invention is further explained by combining the drawings and the specific embodiments in the specification. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The invention provides an RC oscillator.
Referring to fig. 1, fig. 1 is a block diagram of an RC oscillator according to an embodiment of the present invention.
The RC oscillator of the present invention includes a clock module 10, a temperature detection module 20, a processing module 30 and an adjustment module 40.
Specifically, the clock module 10 is a clock circuit for generating an oscillation frequency, the clock module 10 has a power input terminal and a control terminal, and preferably, the clock module 10 is integrated into a chip. The temperature detection module 20 includes a temperature sensor attached to or disposed inside the integrated chip. The temperature detection module 20 is used for detecting the temperature of the clock module 10 in real time and sending the temperature to the processing module 30, the input end of the processing module 30 is connected with the output end of the temperature detection module 20, the output end of the processing module 30 is connected with the input end of the adjustment module 40, when the temperature information sent by the temperature detection module 20 is received, the temperature value and the preset temperature value are analyzed, then an analysis result is obtained, and the analysis result is sent to the adjustment module 40; the input end of the adjusting module 40 is connected to the output end of the processing module 30, and the output end is connected to the control end of the clock module 10, and after receiving the analysis result, the preset frequency trimming value is selected according to the analysis result, and the output frequency is adjusted according to the selected frequency trimming value. The preset temperature value and the preset frequency trimming value are both stored in the memory and can be retrieved from the memory when needed.
The processing module 30 is an arithmetic unit (not shown in the figure), and the arithmetic unit is configured to perform subtraction on the temperature detected by the temperature detecting module 20 and a preset temperature value, and send a calculation result to the adjusting module 40. A plurality of calculation results can be preset in the memory according to needs, and each calculation result corresponds to a preset frequency trimming value. Or,
the processing module 30 is a comparing unit (not shown in the figure), and the comparing unit is configured to compare the temperature detected by the temperature detecting module 20 with a preset temperature value, and send a comparison result to the adjusting module 40. And, can set up the comparative result in the memorizer in advance as required, when the temperature value detected is greater than the temperature value preserved, send the order to the adjusting module 40, the adjusting module 40 adjusts the output frequency according to the preset trimming value.
Referring to fig. 2, fig. 2 is a block diagram of another embodiment of the RC oscillator of the present invention.
Based on the first embodiment, in order to prevent the oscillation frequency from being affected by the fluctuation of the external power supply voltage, the present embodiment further includes a dc regulated power supply 50 for supplying a stable voltage to the clock module 10; the clock module 10 further has a power input terminal, and the power output terminal of the dc regulated power supply 50 is connected to the power input terminal of the clock module 10. The dc regulated power supply 50 has stable output and is not easily affected by temperature or external load voltage variation. When the power supply voltage of the clock module 10 is stabilized, the frequency output is also stabilized.
Further, the dc regulated power supply 50 is an LDO low voltage regulator. The LDO low-voltage regulator is a low-dropout linear voltage regulator, and has the advantages of low cost, low noise, small quiescent current, stable output and low possibility of being influenced by temperature or external load voltage change.
Referring to fig. 3, fig. 3 is a block diagram of a structure of another embodiment of the RC oscillator of the present invention.
Based on the first embodiment, in order to further improve the oscillation frequency without being affected by the fluctuation of the external power voltage, the embodiment further includes a voltage detection module 60 for detecting the power voltage of the clock module 10 in real time; the clock module 10 further has a voltage end to be measured, the detection end of the voltage detection module 60 is connected with the voltage end to be measured of the clock module 10, and the output end of the clock module 10 is connected with the input end of the processing module 30. The power supply voltage of the clock module 10 is detected in real time through the voltage detection module 60 and is sent to the processing module 30, when the processing module 30 receives the voltage information sent by the voltage detection module 60, the subtraction calculation is performed on the voltage value and a preset voltage value, then a voltage calculation result is obtained, and then the voltage calculation result is sent to the adjustment module 40; the preset voltage value and the preset frequency trimming value are both stored in the memory and can be retrieved from the memory when needed. And after receiving the voltage calculation result, selecting a preset frequency trimming value according to the voltage calculation result, and adjusting the output frequency according to the selected frequency trimming value. A plurality of voltage calculation results can be preset in the memory according to needs, and each voltage calculation result corresponds to a preset frequency trimming value.
Further, the voltage detection module 60 is an RC oscillator power supply voltage detection circuit. The RC oscillator power supply voltage detection circuit is a low voltage detection circuit, and can more accurately detect the fluctuation condition of the input power supply voltage of the clock module 10.
The RC oscillator detects the temperature of the clock module 10 in real time through the temperature detection module 20, the processing module 30 analyzes the temperature detected by the temperature detection module 20 and a preset temperature value and sends an analysis result to the adjustment module 40, and after the adjustment module 40 receives the analysis result, a preset frequency trimming value is selected according to the analysis result and the output frequency of the clock module 10 is correspondingly adjusted according to the selected frequency trimming value, so that the influence of the external environment (such as temperature) on the frequency output of the RC oscillator is reduced, and the frequency output precision of the RC oscillator is ensured.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (7)
1. An RC oscillator, including the clock module that produces oscillation frequency, its characterized in that still includes temperature detection module, processing module and adjustment module, the clock module has a control end, the output of temperature detection module is connected with processing module's input, processing module's output is connected with adjustment module's input, adjustment module's output is connected with clock module's control end, wherein:
the temperature detection module is used for detecting the temperature of the clock module in real time;
the processing module is used for analyzing the temperature detected by the temperature detection module and a preset temperature value and sending an analysis result to the adjustment module;
the adjusting module is used for selecting a preset frequency trimming value according to the analysis result and correspondingly adjusting the output frequency of the clock module according to the selected frequency trimming value after receiving the analysis result;
the device also comprises a memory and a voltage detection module for detecting the power supply voltage of the clock module in real time; the clock module is also provided with a measured voltage end, and the detection end of the voltage detection module is connected with the measured voltage end of the clock module; the voltage detection module is used for detecting the power supply voltage of the clock module in real time and sending the detected voltage value to the processing module; the processing module performs subtraction operation on the voltage value and a preset voltage value, and obtains a voltage calculation result; the adjusting module is used for receiving the voltage calculation result and selecting a preset frequency trimming value according to the voltage calculation result to adjust the output frequency of the clock module; the memory stores a plurality of voltage calculation results, and each calculation result corresponds to a preset frequency trimming value;
the clock module is an integrated chip, and the temperature detection module comprises a temperature sensor arranged inside the integrated chip.
2. The RC oscillator of claim 1, wherein the processing module is an arithmetic unit, and the arithmetic unit is configured to subtract the temperature detected by the temperature detecting module from a preset temperature value and send the subtraction result to the adjusting module.
3. The RC oscillator of claim 1, wherein the processing module is a comparing unit, and the comparing unit is configured to compare the temperature detected by the temperature detecting module with a preset temperature value, and send the comparison result to the adjusting module.
4. The RC oscillator of claim 1, wherein the clock module is a clock circuit.
5. The RC oscillator of claim 1, further comprising a dc regulated power supply for providing a regulated voltage to the clock module; the clock module is also provided with a power supply input end, and the power supply output end of the direct current stabilized power supply is connected with the power supply input end of the clock module.
6. The RC oscillator of claim 5, wherein the regulated DC power supply is an LDO low voltage regulator.
7. The RC oscillator of claim 1, wherein the voltage detection module is an RC oscillator supply voltage detection circuit.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310157715.3A CN103281055B (en) | 2013-04-28 | 2013-04-28 | Rc oscillator |
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| CN201310157715.3A CN103281055B (en) | 2013-04-28 | 2013-04-28 | Rc oscillator |
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| CN103281055A CN103281055A (en) | 2013-09-04 |
| CN103281055B true CN103281055B (en) | 2016-09-07 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105807133B (en) * | 2014-12-30 | 2018-11-27 | 无锡华润矽科微电子有限公司 | Realize the system that frequency trims integrated control |
| CN111404484B (en) * | 2020-04-26 | 2020-12-08 | 珠海迈巨微电子有限责任公司 | RC oscillators and electrical equipment |
| CN113364451A (en) * | 2021-06-28 | 2021-09-07 | 南京英锐创电子科技有限公司 | Clock frequency calibration method, system, computer device and storage medium |
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| CN1489828A (en) * | 2000-12-21 | 2004-04-14 | ����ɭ�绰�ɷ�����˾ | Oscilating circuit and method for callberating same |
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| CN101443666A (en) * | 2006-02-27 | 2009-05-27 | 硅谷实验室公司 | Reference-less clock circuit |
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| CN203225723U (en) * | 2013-04-28 | 2013-10-02 | 深圳市芯海科技有限公司 | Rc oscillator |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US20080068100A1 (en) * | 2006-09-12 | 2008-03-20 | Goodnow Kenneth J | Power management architecture and method of modulating oscillator frequency based on voltage supply |
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| CN1489828A (en) * | 2000-12-21 | 2004-04-14 | ����ɭ�绰�ɷ�����˾ | Oscilating circuit and method for callberating same |
| CN1395153A (en) * | 2001-07-11 | 2003-02-05 | 仁宝电脑工业股份有限公司 | Peripherals for portable computers |
| CN1722599A (en) * | 2004-07-02 | 2006-01-18 | 精工爱普生株式会社 | Driving method, driving device and electronic equipment of piezoelectric actuator |
| CN101443666A (en) * | 2006-02-27 | 2009-05-27 | 硅谷实验室公司 | Reference-less clock circuit |
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Address after: 518000, A building, block 9, garden city digital garden, 1079 Nanhai Road, Guangdong, Shenzhen, Nanshan District Patentee after: Chipsea Technology (Shenzhen) Co., Ltd. Address before: 518000 Guangdong city of Shenzhen province Nanshan District Nanhai Road No. 1079 Garden City digital building block A No. 901A Patentee before: Xinhai Science and Technology Co., Ltd., Shenzhen City |
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