CN111865219A - Oscillator with wide temperature range and automatic temperature compensation - Google Patents
Oscillator with wide temperature range and automatic temperature compensation Download PDFInfo
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- CN111865219A CN111865219A CN202010421422.1A CN202010421422A CN111865219A CN 111865219 A CN111865219 A CN 111865219A CN 202010421422 A CN202010421422 A CN 202010421422A CN 111865219 A CN111865219 A CN 111865219A
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
- H03B5/00—Generation of oscillations using amplifier with regenerative feedback from output to input
- H03B5/02—Details
- H03B5/04—Modifications of generator to compensate for variations in physical values, e.g. power supply, load, temperature
Abstract
The invention discloses an oscillator with wide temperature range and automatic temperature compensation, and relates to the technical field of integrated circuits. The oscillator comprises a temperature detection module, a selection module and a clock generation module with temperature compensation; the temperature detection module outputs a detection result by comparing the input voltage with the reference voltage; the temperature detection module sends the detection result to the selection module, and the selection module judges the temperature range of the circuit according to the detection result so as to output a control signal to the clock generation module with temperature compensation; and the clock generation module with the temperature compensation switches on a corresponding temperature compensation scheme according to the control signal so as to output the clock signal after the temperature compensation. According to the technical scheme, the temperature detection module is used for detecting the current environment temperature, the selection module is used for judging the current environment temperature of the circuit, and the corresponding temperature compensation structure is selected to be switched on according to the current environment temperature, so that the high-precision oscillator with wide temperature range and automatic temperature compensation is realized.
Description
Technical Field
The invention relates to the technical field of integrated circuits, in particular to an oscillator with wide temperature range and automatic temperature compensation.
Background
At present, most of on-chip integrated low-power consumption and small-area clock generation circuits are resistance-capacitance oscillators (RCOSCs), but due to the temperature coefficient of a resistor, the output clock has large variation with temperature. For the problem, a common optimization scheme is to combine two resistors with opposite temperature coefficients, so that the total resistance changes with temperature as little as possible after combination, and the problem that the output clock frequency changes too much with temperature is solved.
However, with the continuous progress of technology, such compensation schemes are gradually unable to meet the requirements of practical applications. Because two resistors with opposite temperature coefficients are combined together, the resistance value can only be realized to be small along with the temperature change within a narrow temperature range (such as 0-85 ℃), and the resistance value is still large along with the temperature change within a full temperature range (-40-125 ℃), especially at the low temperature end and the high temperature end, namely, the traditional compensation scheme can not realize the temperature coefficient with low output clock frequency within the full temperature range (-40-125 ℃).
Disclosure of Invention
The invention mainly aims to provide an oscillator with wide temperature range and automatic temperature compensation, aiming at realizing the temperature coefficient with low output clock frequency in the full temperature range.
In order to achieve the above object, the present invention provides an oscillator with wide temperature range and automatic temperature compensation, the oscillator includes a temperature detection module, a selection module and a clock generation module with temperature compensation; the temperature detection module outputs a detection result by comparing the input voltage with the reference voltage; the temperature detection module sends the detection result to the selection module, and the selection module judges the temperature range of the circuit according to the detection result so as to output a control signal to the clock generation module with temperature compensation; and the clock generation module with the temperature compensation is connected with the corresponding temperature compensation structure according to the control signal so as to output the clock signal after the temperature compensation.
Preferably, the temperature detection module comprises a first comparator, a second comparator, a current source and a temperature sensing resistor for sensing the ambient temperature; one end of the temperature sensing resistor is connected to the current source, and the other end of the temperature sensing resistor is grounded; the input end of the first comparator is connected to the current source and a first reference voltage so as to compare the magnitude of the input voltage with the magnitude of the first reference voltage, and the output end of the first comparator is connected to the selection module so as to output a comparison result to the selection module; the input end of the second comparator is connected to the current source and a second reference voltage so as to compare the magnitude of the input voltage with the magnitude of the second reference voltage, and the output end of the second comparator is connected to the selection module so as to output a comparison result to the selection module.
Preferably, the first reference voltage is an input voltage at a temperature of 85 ℃; the second reference voltage is an input voltage at a temperature of 0 ℃.
Preferably, the input voltage is connected to the same input terminal of the first comparator and the second comparator, and the reference voltage is connected to the other input terminal of the first comparator and the second comparator.
Preferably, the temperature coefficients of the current source and the temperature sensing resistor are the same.
Preferably, the clock generation module with temperature compensation comprises three groups of temperature compensation structures to compensate the clock signals output when the ambient temperature is less than 0 ℃, greater than 0 ℃ and less than 85 ℃ and greater than 85 ℃ respectively.
Preferably, the selection module comprises three sets of temperature compensation register configurations to correspondingly select one of the three sets of temperature compensation structures to be turned on according to the detection result.
The invention adopts the technical scheme that the temperature detection module is used for detecting the current environment temperature, the selection module is used for judging the current environment temperature of the circuit according to the detection result of the temperature detection module and selecting to switch on the corresponding temperature compensation structure according to the current environment temperature so as to enable the clock generation module with the temperature compensation to output the clock signal after the temperature compensation, thereby realizing the high-precision oscillator with wide temperature range and automatic temperature compensation.
Drawings
FIG. 1 is a schematic diagram of the circuit of the wide temperature range automatic temperature compensated oscillator of the present invention;
FIG. 2 is a block diagram of a clock generation module with temperature compensation in one embodiment of the wide temperature range automatic temperature compensated oscillator of the present invention;
fig. 3 is a block diagram of a clock generation module with temperature compensation in another embodiment of the wide temperature range automatic temperature compensated 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
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 is further described below with reference to the accompanying drawings.
An oscillator with wide temperature range automatic temperature compensation, as shown in fig. 1, includes a temperature detection module, a selection module and a clock generation module with temperature compensation; the temperature detection module outputs a detection result by comparing the input voltage V _ R with the reference voltage; the temperature detection module sends the detection result to the selection module, and the selection module judges the temperature range of the circuit according to the detection result so as to output a control signal to the clock generation module with temperature compensation; and the clock generation module with the temperature compensation is connected with the corresponding temperature compensation structure according to the control signal so as to output the clock signal CLK _ OUT after the temperature compensation.
Preferably, the temperature detection module comprises a first comparator COMP1, a second comparator COMP2, a current source, and a temperature sensing resistor R _ TEMP for sensing the ambient temperature; one end of the temperature sensing resistor R _ TEMP is connected to the current source, and the other end of the temperature sensing resistor R _ TEMP is grounded; an input end of the first comparator COMP1 is connected to the current source and a first reference voltage V85 ℃ to compare the magnitude of the input voltage V _ R with the magnitude of the first reference voltage V85 ℃, and an output end of the first comparator COMP1 is connected to the selection module to output a comparison result to the selection module; an input end of the second comparator COMP2 is connected to the current source I _ R and a second reference voltage V0 ℃ to compare the magnitudes of the input voltage V _ R and the second reference voltage V0 ℃, and an output end of the second comparator COMP2 is connected to the selection module to output a comparison result to the selection module.
The working principle of the temperature detection module is as follows: the current I _ R of the current source flows through the temperature sensing resistor R _ TEMP to generate the input voltage V _ R ═ I _ R _ TEMP. Since the temperature sensing resistor R _ TEMP has a temperature coefficient (the temperature coefficient may be a positive temperature coefficient or a negative temperature coefficient), in this embodiment, the temperature coefficient of the preset temperature sensing resistor R _ TEMPR _ TEMP is a positive temperature coefficient, that is, the resistance value of the temperature sensing resistor R _ TEMP increases with the temperature increase, when the temperature increases, the input voltage V _ R increases, and when the temperature decreases, the input voltage V _ R decreases;
The first reference voltage V85 ℃ is the value of the input voltage V _ R at an ambient temperature of 85 ℃; the second reference voltage V0 ℃ is the value of the input voltage V _ R at an ambient temperature of 0 ℃. Specifically, the first reference voltage V85 ℃ > the second reference voltage V0 ℃, and the first reference voltage V85 ℃ and the second reference voltage V0 ℃ are zero temperature coefficient, i.e., the first reference voltage V85 ℃ and the second reference voltage V0 ℃ do not change with temperature changes, in a specific embodiment, the first reference voltage V85 ℃ and the second reference voltage V0 ℃ may be generated by a bandgap reference standard module. When the ambient temperature is lower than 0 ℃, V _ R < V0 ℃ < V85 ℃, the output SEL <1:0> of the two comparators is 11; when the ambient temperature is 0-85 ℃, the output SEL <1:0> of the two comparators is 10 when V0 ℃ < V _ R < V85 ℃; when the ambient temperature is higher than 85 ℃, it is known that V0 ℃ < V85 ℃ < V _ R, the outputs SEL <1:0> of the two comparators are 00.
Preferably, the first reference voltage V85 ℃ is an input voltage V _ R at a temperature of 85 ℃; the second reference voltage V0 ℃ is the input voltage V _ R at the temperature of 0 ℃.
Preferably, the input voltage V _ R is connected to the same input terminal of the first comparator COMP1 and the second comparator COMP2, and the reference voltage is connected to the other input terminal of the first comparator COMP1 and the second comparator COMP 2. Specifically, in the present embodiment, the input voltage V _ R is respectively connected to the inverting input terminals of the two comparators, the first reference voltage V85 ℃ is connected to the non-inverting input terminal of the first comparator, and the second reference voltage V0 ℃ is connected to the non-inverting input terminal of the second comparator. In other embodiments, the input voltage V _ R may also be connected to the non-inverting input terminals of the two comparators, and the reference voltage is connected to the inverting input terminals of the two comparators.
Preferably, the temperature coefficients of the current source and the temperature sensing resistor R _ TEMP are the same.
Specifically, the temperature coefficient of the current I _ R of the current source is the same as that of the temperature sensing resistor R _ TEMP. When the current I _ R of the current source and the temperature sensing resistor R _ TEMP have the same temperature coefficient, the input voltage V _ R can be more sensitive to the temperature change, and the resistance value of the temperature sensing resistor R _ TEMP can be reduced, so that the consumed area of the temperature sensing resistor R _ TEMP is reduced. In other embodiments, the temperature coefficient of the current I _ R of the current source may also be a zero temperature coefficient.
Preferably, the clock generation module with temperature compensation comprises three groups of temperature compensation structures to compensate the clock signal CLK _ OUT output when the ambient temperature is less than 0 ℃, greater than 0 ℃ and less than 85 ℃ and greater than 85 ℃ respectively.
In a specific embodiment, as shown in fig. 2, the clock generation module with temperature compensation includes three sets of compensation currents connected to the selection module through switches, each set of compensation currents includes a pair of compensation currents with opposite temperature coefficients, and the ratio of positive and negative temperature currents of each pair of compensation currents is not equal, so that the temperature compensation of different temperature segments can be satisfied. Specifically, when the ambient temperature is between 0 ℃ and 85 ℃, the outputs SEL <1:0> of the two comparators are 10, and the selection module turns on the first switch S1 and the second switch S2 according to the output result of the comparators, so that the selection module selects to turn on the first group of temperature compensation structures: the first compensation current I1 and the second compensation current I2 are used for compensating the output clock signal CLK _ OUT when the circuit temperature is between 0 ℃ and 85 ℃. When the ambient temperature is lower than 0 ℃, the outputs SEL <1:0> -11 of the two comparators, and the selection module selects to turn on the third switch S3 and the fourth switch S4 according to the output result of the comparators, so that the selection module selects to turn on the second group of temperature compensation structures: the third compensation current I3 and the fourth compensation current I4 are used for compensating the output clock signal CLK _ OUT when the circuit temperature is lower than 0 ℃. When the ambient temperature is higher than 85 ℃, the outputs SEL <1:0> of the two comparators are 00, and the selection module selects to turn on the fifth switch S5 and the sixth switch S6 according to the comparison result of the comparators, so that the selection module selects to turn on the third group of temperature compensation structures: the fifth compensation current I5 and the sixth compensation current I6 are used for compensating the output clock signal CLK _ OUT when the circuit temperature is higher than 85 ℃. In this embodiment, the compensation current in each temperature segment is exactly two currents, so that two configuration words are output; when the temperature compensation of each temperature section exceeds two paths, the selection module is required to output more than 2 configuration words to the clock generation module with the temperature compensation.
In another embodiment, as shown in fig. 3, the clock generation module with temperature compensation includes three sets of compensation resistors connected to the selection module through switches, each set of compensation resistors includes a pair of compensation resistors with opposite temperature coefficients, and the ratio of the positive temperature resistance to the negative temperature resistance of each pair of compensation resistors is not equal, wherein the first compensation resistor R1 and the second compensation resistor R2, the third compensation resistor R3 and the fourth compensation resistor R4, and the fifth compensation resistor R5 and the sixth compensation resistor R6 are resistors with three positive temperature coefficients and three negative temperature coefficients respectively, so as to correspond to different temperature segments. And the selection module outputs corresponding output according to the output results of the two comparators and distributes the corresponding output to the clock generation module with temperature compensation so as to gate the temperature compensation structure of the corresponding temperature section. In this embodiment, the compensation resistors in each temperature segment are exactly two paths, so that the number of configuration words to be output is 2; when the temperature compensation of each temperature section exceeds two paths, the selection module is required to output more than 2 configuration words to the clock generation module with the temperature compensation.
In other embodiments, the temperature compensation structure in the clock generation module with temperature compensation can also be implemented by using other temperature compensation schemes in the prior art.
Preferably, the selection module comprises three sets of temperature compensation register configurations to correspondingly select one of the three sets of temperature compensation structures to be turned on according to the detection result.
It should be understood that the above is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all equivalent structures or equivalent flow transformations made by the present specification and drawings, or applied directly or indirectly to other related technical fields, are included in the scope of the present invention.
Claims (7)
1. The oscillator is characterized by comprising a temperature detection module, a selection module and a clock generation module with temperature compensation;
the temperature detection module outputs a detection result by comparing the input voltage with the reference voltage;
the temperature detection module sends the detection result to the selection module, and the selection module judges the temperature range of the circuit according to the detection result so as to output a control signal to the clock generation module with temperature compensation;
and the clock generation module with the temperature compensation is connected with the corresponding temperature compensation structure according to the control signal so as to output the clock signal after the temperature compensation.
2. The wide temperature range automatic temperature compensated oscillator of claim 1, wherein the temperature detection module comprises a first comparator, a second comparator, a current source, and a temperature sensing resistor for sensing ambient temperature;
one end of the temperature sensing resistor is connected to the current source, and the other end of the temperature sensing resistor is grounded;
the input end of the first comparator is connected to the current source and a first reference voltage so as to compare the magnitude of the input voltage with the magnitude of the first reference voltage, and the output end of the first comparator is connected to the selection module so as to output a comparison result to the selection module;
the input end of the second comparator is connected to the current source and a second reference voltage so as to compare the magnitude of the input voltage with the magnitude of the second reference voltage, and the output end of the second comparator is connected to the selection module so as to output a comparison result to the selection module.
3. The wide temperature range automatic temperature compensated oscillator of claim 2, wherein the first reference voltage is an input voltage at a temperature of 85 ℃; the second reference voltage is an input voltage at a temperature of 0 ℃.
4. The wide temperature range automatic temperature compensated oscillator of claim 2, wherein the input voltage is connected to the same input of the first comparator and the second comparator, and the reference voltage is connected to the other input of the first comparator and the second comparator.
5. The wide temperature range automatic temperature compensated oscillator of claim 2, wherein the temperature coefficients of the current source and the temperature sensitive resistor are the same.
6. The wide temperature range automatic temperature compensated oscillator of claim 1, wherein the clock generation module with temperature compensation comprises three sets of temperature compensation structures to compensate the clock signals output when the ambient temperature is less than 0 ℃, greater than 0 ℃ and less than 85 ℃ and greater than 85 ℃ respectively.
7. The wide temperature range automatic temperature compensated oscillator of claim 6, wherein the selection module comprises three sets of temperature compensation register configurations to correspondingly select one of the three sets of temperature compensation structures to be turned on based on the detection result.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010421422.1A CN111865219A (en) | 2020-05-18 | 2020-05-18 | Oscillator with wide temperature range and automatic temperature compensation |
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| CN202010421422.1A CN111865219A (en) | 2020-05-18 | 2020-05-18 | Oscillator with wide temperature range and automatic temperature compensation |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112491397A (en) * | 2020-12-07 | 2021-03-12 | 成都锐成芯微科技股份有限公司 | Multi-frequency-point RC oscillator |
| CN113824442A (en) * | 2021-09-26 | 2021-12-21 | 合肥甘尧电子科技有限公司 | Temperature compensation control system of chip oscillator |
-
2020
- 2020-05-18 CN CN202010421422.1A patent/CN111865219A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112491397A (en) * | 2020-12-07 | 2021-03-12 | 成都锐成芯微科技股份有限公司 | Multi-frequency-point RC oscillator |
| CN113824442A (en) * | 2021-09-26 | 2021-12-21 | 合肥甘尧电子科技有限公司 | Temperature compensation control system of chip oscillator |
| CN113824442B (en) * | 2021-09-26 | 2024-02-13 | 合肥甘尧电子科技有限公司 | Chip oscillator temperature compensation control system |
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