CN114268297B - Relaxation oscillator circuit with temperature compensation - Google Patents
Relaxation oscillator circuit with temperature compensation Download PDFInfo
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- CN114268297B CN114268297B CN202111530813.8A CN202111530813A CN114268297B CN 114268297 B CN114268297 B CN 114268297B CN 202111530813 A CN202111530813 A CN 202111530813A CN 114268297 B CN114268297 B CN 114268297B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention relates to a relaxation oscillator circuit with temperature compensation, and belongs to the technical field of integrated circuits. The circuit comprises 14 MOS tubes, namely M1, M2, M3 … … M14, two resistors R1 and R2, a capacitor C1 and three inverters INV1, INV2 and INV3. According to the invention, the temperature compensation is completed through a charge-discharge capacitor and a very typical PTAT current generation circuit and a CTAT current generation circuit, so that the power consumption of a chip is reduced, and the area overhead is saved; the differential input comparator in the traditional relaxation oscillator structure is not used, so that the design difficulty of a circuit is reduced, and the power consumption is saved; the circuit can be widely applied to relaxation oscillator modules, and conventional devices in CMOS technology are used, so that the circuit is very convenient to integrate.
Description
Technical Field
The invention relates to a relaxation oscillator circuit with temperature compensation, and belongs to the technical field of integrated circuits.
Background
In the field of analog CMOS integrated circuits, oscillators are one of the most common functional modules, such as LC oscillators, ring oscillators, and relaxation oscillators, where LC oscillators and ring oscillators are commonly used in phase-locked loop systems, and cannot be used as a separate functional module to provide a stable clock for a chip, because both an inductance, a capacitance, and a ring oscillator are easily affected by a process, a temperature, and an operating voltage, which results in a large change in an oscillation frequency. In comparison, the relaxation oscillator is simple in structure, low in power consumption and easy to control the precision of output frequency, and meanwhile, corresponding compensation is easy to carry out according to the changes of process, temperature and working voltage, so that the relaxation oscillator is more and more concerned in the field of low-power consumption portable chip design.
Patent application number: 201810086190. X "discloses a novel relaxation oscillator circuit, although the structure has been optimized relatively purposefully for the relaxation oscillator structure, the structure inevitably uses a differential input comparator, and the maximum frequency and accuracy at which the oscillator can operate are severely limited by the speed of the comparator, and if the speed of the comparator is required to be increased, the power consumption must be increased, which also limits the application of the oscillator in certain fields.
Disclosure of Invention
The invention aims to solve the technical problems that: a relaxation oscillator circuit with temperature compensation is provided.
In order to solve the technical problems, the technical scheme provided by the invention is as follows: a relaxation oscillator circuit with temperature compensation comprises 14 MOS transistors, namely M1, M2, M3 … … M14, two resistors R1 and R2, a capacitor C1 and three inverters INV1, INV2 and INV3; the source ends of M1, M2, M3, M9, M10 and M11 are all connected with a power supply; the source ends of M5, M7, M13 and M14 are all grounded; the gate end of M1 is connected with the drain end of M1 and with the gate end of M2, the gate end of M3 and the drain end of M4; the drain end of M2 is connected with the drain end of M5, the gate end of M5 and the gate end of M4; the drain end of M3 is connected with the drain end of M6, the gate end of M6 and the gate end of M8; the source end of M4 is grounded through a resistor R1; the source end of M6 is connected with the drain end of M7 and the gate end of M7; the drain end of M8 is connected with the drain end of M9, the gate end of M9 and the gate end of M10, and the source end of M8 is grounded through R2; the drain end of M10 is connected with one end of a capacitor C1, the gate end of M12 and the drain end of M14, and the other end of the capacitor C1 is grounded; the drain end of M11 is connected with the source end of M12 and the input end of INV 1; the drain end of M12 is connected with the drain end of M13 and the gate end of M13; the gate end of M14 and the output end of INV3 are both connected with the clock output end; the output end of the INV1 is connected with the input end of the INV2, and the output end of the INV2 is connected with the input end of the INV 3.
The beneficial effects of the invention are as follows: according to the invention, the temperature compensation is completed through a charge-discharge capacitor and a very typical PTAT current generation circuit and a CTAT current generation circuit, so that the power consumption of a chip is reduced, and the area overhead is saved; the differential input comparator in the traditional relaxation oscillator structure is not used, so that the design difficulty of a circuit is reduced, and the power consumption is saved; the circuit can be widely applied to relaxation oscillator modules, and conventional devices in CMOS technology are used, so that the circuit is very convenient to integrate.
Drawings
Fig. 1 is a schematic diagram of a relaxation oscillator circuit principle analysis with temperature compensation and simple structure according to an embodiment of the present invention.
Detailed Description
Example 1
As shown in FIG. 1, the relaxation oscillator circuit with temperature compensation comprises 14 MOS transistors, namely M1, M2, M3 … … M14, two resistors R1 and R2, a capacitor C1 and three inverters INV1, INV2 and INV3; the source ends of M1, M2, M3, M9, M10 and M11 are all connected with a power supply; the source ends of M5, M7, M13 and M14 are all grounded; the gate end of M1 is connected with the drain end of M1 and with the gate end of M2, the gate end of M3 and the drain end of M4; the drain end of M2 is connected with the drain end of M5, the gate end of M5 and the gate end of M4; the drain end of M3 is connected with the drain end of M6, the gate end of M6 and the gate end of M8; the source end of M4 is grounded through a resistor R1; the source end of M6 is connected with the drain end of M7 and the gate end of M7; the drain end of M8 is connected with the drain end of M9, the gate end of M9 and the gate end of M10, and the source end of M8 is grounded through R2; the drain end of M10 is connected with one end of a capacitor C1, the gate end of M12 and the drain end of M14, and the other end of the capacitor C1 is grounded; the drain end of M11 is connected with the source end of M12 and the input end of INV 1; the drain end of M12 is connected with the drain end of M13 and the gate end of M13; the gate end of M14 and the output end of INV3 are both connected with the clock output end; the output end of the INV1 is connected with the input end of the INV2, and the output end of the INV2 is connected with the input end of the INV 3.
Wherein, MOS transistors M1, M2, M4, M5 and resistor R1 form a bias current generating circuit, the magnitude of bias current is I1 and is mirrored to the current paths of M3 and M11 in equal proportion, then the magnitude of M6, M7 is equal to that of M12 and M13, then the gate voltage V G6 of M6 and the gate voltage V G12 of M12 are equal and satisfy the following expression,
VG6＝VG12＝VGS6+VGS7 (1)
It is assumed that VGS 6-VGS 7-VGS 8 is made by choosing an appropriate resistance value R2, so that the current I R2 through R2 can be expressed as,
Assuming that the mirror ratio of M9 to M10 is 1:1, the current flowing through R2 is the current that charges the capacitor C1, when the upper plate voltage of the capacitor C1 is greater than V G12, the drain voltage VD12 of M12 will be pulled down, the gate voltage of M14 is high after passing through INV1, INV2 and INV3, M14 is turned on, the charge stored in the capacitor C1 will be discharged, the upper plate voltage V G12 is pulled down, so that the drain voltage of M12 will be charged up by the M11 tube, the gate voltage of M14 is low after passing through INV1, INV2 and INV3, the M14 tube is turned off, and the M10 tube will charge up again for the capacitor C1, so that the output of the inverter INV3 will generate the clock CLK repeatedly. In a CMOS integrated circuit, the capacitance is less affected by temperature, that is, the resistor is affected by temperature, that is, the oscillator takes a charge time, and the resistor R2 is affected by temperature change, and a professional in the integrated circuit knows that the MOS transistors M1, M2, M4, M5 and the resistor R1 form a bias current generating circuit, by adjusting the proper size, the bias current I 1 will show PTAT characteristics, and the MOS transistors M3, M6, M7, M8, M9 and the resistor R2 form a bias current generating circuit, by adjusting the proper size, the bias current I R2 will show CTAT characteristics, so that the structure can realize the frequency deviation of the resistor R2 caused by temperature change through proper current adjustment, thereby showing characteristics independent of temperature.
The present invention is not limited to the specific technical solutions described in the above embodiments, and other embodiments may be provided in addition to the above embodiments. Any modifications, equivalent substitutions, improvements, etc. made by those skilled in the art, which are within the spirit and principles of the present invention, are intended to be included within the scope of the present invention.
Claims (1)
1. A relaxation oscillator circuit with temperature compensation, characterized by: the circuit comprises 14 MOS transistors, namely M1, M2, M3 … … M14, two resistors R1 and R2, a capacitor C1 and three inverters INV1, INV2 and INV3; the source ends of M1, M2, M3, M9, M10 and M11 are all connected with a power supply; the source ends of M5, M7, M13 and M14 are all grounded; the gate end of M1 is connected with the drain end of M1 and with the gate end of M2, the gate end of M3 and the drain end of M4; the drain end of M2 is connected with the drain end of M5, the gate end of M5 and the gate end of M4; the drain end of M3 is connected with the drain end of M6, the gate end of M6 and the gate end of M8; the source end of M4 is grounded through a resistor R1; the source end of M6 is connected with the drain end of M7 and the gate end of M7; the drain end of M8 is connected with the drain end of M9, the gate end of M9 and the gate end of M10, and the source end of M8 is grounded through R2; the drain end of M10 is connected with one end of a capacitor C1, the gate end of M12 and the drain end of M14, and the other end of the capacitor C1 is grounded; the drain end of M11 is connected with the source end of M12 and the input end of INV 1; the drain end of M12 is connected with the drain end of M13 and the gate end of M13; the gate end of M14 and the output end of INV3 are both connected with the clock output end; the output end of the INV1 is connected with the input end of the INV2, and the output end of the INV2 is connected with the input end of the INV 3.
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| TWI794081B (en) * | 2022-04-20 | 2023-02-21 | 新唐科技股份有限公司 | Oscillator with temperature compensation and electronic device using the same |
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| CN102420591A (en) * | 2011-11-18 | 2012-04-18 | 上海复旦微电子集团股份有限公司 | Oscillator |
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| CN105932976A (en) * | 2016-05-25 | 2016-09-07 | 电子科技大学 | Temperature compensation circuit for crystal oscillator |
| CN109962692A (en) * | 2017-12-22 | 2019-07-02 | 德克萨斯仪器股份有限公司 | Use the precision oscillator of inaccurate component |
| CN113452352A (en) * | 2020-03-27 | 2021-09-28 | 旺宏电子股份有限公司 | Adjustable current mode relaxation oscillator |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| KR101585231B1 (en) * | 2009-01-06 | 2016-01-14 | 삼성전자주식회사 | Oscillator for providing constant oscillation signal without power voltage and temperature changes and signal processing device for the same |
| EP2897021B1 (en) * | 2014-01-21 | 2020-04-29 | Dialog Semiconductor (UK) Limited | An apparatus and method for a low voltage reference and oscillator |
| US10461700B2 (en) * | 2016-11-11 | 2019-10-29 | Skyworks Solutions, Inc. | Temperature compensated oscillator |
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| CN102420591A (en) * | 2011-11-18 | 2012-04-18 | 上海复旦微电子集团股份有限公司 | Oscillator |
| CN102664605A (en) * | 2012-03-16 | 2012-09-12 | 电子科技大学 | Relaxation oscillator with low temperature drift characteristic, and debug method thereof |
| CN105932976A (en) * | 2016-05-25 | 2016-09-07 | 电子科技大学 | Temperature compensation circuit for crystal oscillator |
| CN109962692A (en) * | 2017-12-22 | 2019-07-02 | 德克萨斯仪器股份有限公司 | Use the precision oscillator of inaccurate component |
| CN113452352A (en) * | 2020-03-27 | 2021-09-28 | 旺宏电子股份有限公司 | Adjustable current mode relaxation oscillator |
Non-Patent Citations (3)
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