CN113824442B - Chip oscillator temperature compensation control system - Google Patents
Chip oscillator temperature compensation control system Download PDFInfo
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- CN113824442B CN113824442B CN202111131322.6A CN202111131322A CN113824442B CN 113824442 B CN113824442 B CN 113824442B CN 202111131322 A CN202111131322 A CN 202111131322A CN 113824442 B CN113824442 B CN 113824442B
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- 238000011088 calibration curve Methods 0.000 claims abstract description 24
- 238000001514 detection method Methods 0.000 claims abstract description 3
- 239000003990 capacitor Substances 0.000 claims description 13
- 230000010355 oscillation Effects 0.000 claims description 9
- 238000006243 chemical reaction Methods 0.000 claims description 4
- 238000013139 quantization Methods 0.000 claims description 4
- 230000007547 defect Effects 0.000 abstract description 3
- 230000001276 controlling effect Effects 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 230000001105 regulatory effect Effects 0.000 description 4
- 238000004364 calculation method Methods 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000013078 crystal Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION, OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
- H03L1/00—Stabilisation of generator output against variations of physical values, e.g. power supply
- H03L1/02—Stabilisation of generator output against variations of physical values, e.g. power supply against variations of temperature only
Abstract
The invention relates to temperature compensation control, in particular to a chip oscillator temperature compensation control system, which comprises a digital control unit, a temperature sensor, a calibration unit, a compensation unit, a current source, a comparison unit and an oscillator circuit, wherein the calibration unit selects a proper calibration curve according to a detection signal of the temperature sensor and sends the calibration curve to the compensation unit, the compensation unit respectively sends compensation control signals to the current source and the comparison unit based on the calibration curve, a current signal of the current source is sent to the oscillator circuit and the comparison unit through an adjusting switch, and the digital control unit receives an output signal of the comparison unit and controls the adjusting switch; the technical scheme provided by the invention can effectively overcome the defects that the frequency of the oscillator output clock signal is easy to be influenced by temperature to generate larger fluctuation and more hardware resources are required to be consumed when temperature compensation is carried out in the prior art.
Description
Technical Field
The invention relates to temperature compensation control, in particular to a chip oscillator temperature compensation control system.
Background
The microprocessor chip generally comprises 1 or more internal RC oscillator circuits for outputting oscillator clock signals with different frequencies and is applied to each sub-module of the microprocessor. The RC oscillator circuit inside a typical microprocessor has the advantages: the microprocessor can conveniently obtain output clock signals with different frequencies, and an external crystal oscillator is not needed, so that the system cost is reduced, and the system volume is saved. The disadvantages are: the RC oscillator occupies a chip area, and the frequency of the output clock signal of the RC oscillator varies significantly with temperature, and the range of the frequency of the output clock signal of the RC oscillator varying with temperature is about 30% without compensation.
The control principle of the conventional RC oscillator circuit of the microprocessor chip is shown in fig. 6, and by controlling the currents of the i_charge and the i_discharge, and the magnitudes of the capacitor C and the reference levels VH and VL, the microprocessor chip can obtain the oscillator output clock signals with different frequencies.
The control method has the advantages of simple circuit, but when the internal temperature of the microprocessor changes, the current changes of the I_charge and the I_discharge are obvious, and the frequency change of the output clock signal of the oscillator is obvious. Since the frequency of the oscillator output clock signal varies with temperature in a larger range and without significant regularity, temperature compensation of the currents of i_charge and i_discharge requires more hardware resources.
Disclosure of Invention
(one) solving the technical problems
Aiming at the defects existing in the prior art, the invention provides a chip oscillator temperature compensation control system, which can effectively overcome the defects that the frequency of an oscillator output clock signal is easy to be greatly fluctuated due to temperature influence and more hardware resources are required to be consumed when temperature compensation is carried out in the prior art.
(II) technical scheme
In order to achieve the above purpose, the invention is realized by the following technical scheme:
the utility model provides a chip oscillator temperature compensation control system, includes digital control unit, temperature sensor, calibration unit, compensation unit, current source, comparison unit and oscillator circuit, the calibration unit is according to temperature sensor detected signal selection suitable calibration curve and is sent to the compensation unit, the compensation unit is based on calibration curve and is sent compensation control signal to current source, comparison unit respectively, the current signal of current source sends to oscillator circuit, comparison unit through regulating switch, digital control unit receives the output signal of comparison unit to regulating switch controls.
Preferably, the digital control unit controls the current source to charge the oscillator circuit and to supply power to the comparing unit by controlling the regulating switch to be alternately opened and closed.
Preferably, the compensation unit adjusts the oscillation frequency of the output signal of the comparison unit by controlling the magnitude of the tail current inside the comparison unit.
Preferably, the current source includes sub-current sources of various proportions, the current sources selecting different sub-current sources according to the compensation control signal, and the total reference current IREF is sent to the oscillator circuit to adjust the oscillation frequency of the oscillator circuit.
Preferably, the oscillator circuit includes a capacitor C0 and a capacitor C1.
Preferably, the calibration unit stores different calibration curves, and selects an appropriate calibration curve according to input information and sends the calibration curve to the compensation unit.
Preferably, the compensation unit performs quantization conversion on the calibration curve, and sends the result to the current source and the comparison unit for calibration and compensation.
(III) beneficial effects
Compared with the prior art, the temperature compensation control system of the chip oscillator provided by the invention has the following beneficial effects:
1) The hardware resources required to be increased are fewer when the temperature compensation is carried out, a large amount of memory and logic calculation resources are not required, compensation data and logic calculation processing are stored, and only a few internal logic circuits are required to be increased;
2) The frequency fluctuation of the output clock signal of the oscillator after temperature compensation is extremely small along with the temperature change, and the application scene with higher requirement on the frequency stability of the oscillator can be met.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It is evident that the drawings in the following description are only some embodiments of the present invention and that other drawings may be obtained from these drawings without inventive effort for a person of ordinary skill in the art.
FIG. 1 is a schematic diagram of a system of the present invention;
FIG. 2 is a schematic diagram of a calibration curve stored in a calibration unit according to the present invention;
FIG. 3 is a schematic diagram of a current source according to the present invention;
FIG. 4 is a schematic diagram of a comparison unit according to the present invention;
FIG. 5 is a schematic diagram showing the output clock signal frequency and temperature of the oscillator after temperature compensation according to the present invention;
fig. 6 is a schematic diagram of a prior art RC oscillator control circuit.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It will be apparent that the described embodiments are some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The chip oscillator temperature compensation control system comprises a digital control unit, a temperature sensor, a calibration unit, a compensation unit, a current source, a comparison unit and an oscillator circuit, wherein the calibration unit selects a proper calibration curve according to a detection signal of the temperature sensor and sends the calibration curve to the compensation unit, the compensation unit respectively sends compensation control signals to the current source and the comparison unit based on the calibration curve, a current signal of the current source is sent to the oscillator circuit and the comparison unit through an adjusting switch, and the digital control unit receives an output signal of the comparison unit and controls the adjusting switch.
As shown in fig. 2, different calibration curves are stored in the calibration unit, and an appropriate calibration curve is selected according to input information (different temperature processes and voltage conditions) and sent to the compensation unit.
The compensation unit carries out quantization conversion on the calibration curve and sends the result to the current source and the comparison unit for calibration and compensation.
The digital control unit controls the current source to charge the oscillator circuit and supply power to the comparison unit by controlling the adjusting switches (all of which are adjusting switches in three dotted line boxes in fig. 1, and a COMS switch can be adopted).
As shown in fig. 4, the compensation unit adjusts the oscillation frequency of the output signal of the comparison unit by controlling the Itail tail current magnitude inside the comparison unit. For example, the Itail tail current increases, the flip speed of the comparison unit increases, and the oscillation frequency of the output signal increases.
As shown in fig. 3, the current sources include sub-current sources in various proportions, the current sources select different sub-current sources according to the compensation control signal, and the total reference current IREF is transmitted to the oscillator circuit to adjust the oscillation frequency of the oscillator circuit.
In the technical scheme, the oscillator circuit comprises a capacitor C0 and a capacitor C1, and the frequency of an output clock signal can be changed through the capacitor C0 and the capacitor C1. For example, the capacitance C0 and the capacitance C1 increase, and the oscillation frequency decreases. The digital control unit can charge the capacitor C0 and the capacitor C1 respectively by controlling the regulating switch to be opened and closed alternately, so that the normal operation of the oscillator circuit is ensured.
The calibration unit selects a proper calibration curve to be sent to the compensation unit according to the output signal of the temperature sensor in the microprocessor through the processing and calculation of the compensation function, the compensation unit carries out quantization conversion on the calibration curve, the result is sent to the current source and the comparison unit to be calibrated and compensated, the current magnitude of the current source output to the capacitor C0 and the capacitor C1 is adjusted, and the oscillation frequency of the output signal of the comparison unit is adjusted through controlling the Itail tail current magnitude in the comparison unit, so that a stable oscillator output clock signal with extremely small fluctuation along with the temperature change is obtained.
The relationship between the frequency and the temperature of the oscillator output clock signal at this time is, as shown in fig. 5, approximately in the shape of a simple function curve such as a 2 nd order curve or a parabola, and the difference in frequency with the temperature fluctuation range freqmax-freqmin is small.
The above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (4)
1. A chip oscillator temperature compensation control system is characterized in that: the temperature sensor comprises a digital control unit, a temperature sensor, a calibration unit, a compensation unit, a current source, a comparison unit and an oscillator circuit, wherein the calibration unit selects a proper calibration curve according to a detection signal of the temperature sensor and sends the calibration curve to the compensation unit, the compensation unit respectively sends compensation control signals to the current source and the comparison unit based on the calibration curve, the current signal of the current source is sent to the oscillator circuit and the comparison unit through an adjusting switch, and the digital control unit receives an output signal of the comparison unit and controls the adjusting switch;
the digital control unit controls the adjusting switch to be alternately opened and closed so as to control the current source to charge the oscillator circuit and supply power to the comparison unit;
the compensation unit adjusts the oscillation frequency of the output signal of the comparison unit by controlling the tail current in the comparison unit;
the current source comprises sub-current sources with various proportions, the current sources select different sub-current sources according to the compensation control signal, and the total reference current IREF is formed and sent to the oscillator circuit to regulate the oscillation frequency of the oscillator circuit.
2. The chip oscillator temperature compensation control system of claim 1, wherein: the oscillator circuit comprises a capacitor C0 and a capacitor C1.
3. The chip oscillator temperature compensation control system of claim 1, wherein: different calibration curves are stored in the calibration unit, and an appropriate calibration curve is selected according to input information and sent to the compensation unit.
4. The chip oscillator temperature compensation control system of claim 3, wherein: the compensation unit carries out quantization conversion on the calibration curve and sends the result to the current source and the comparison unit for calibration and compensation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111131322.6A CN113824442B (en) | 2021-09-26 | 2021-09-26 | Chip oscillator temperature compensation control system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111131322.6A CN113824442B (en) | 2021-09-26 | 2021-09-26 | Chip oscillator temperature compensation control system |
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| CN113824442A CN113824442A (en) | 2021-12-21 |
| CN113824442B true CN113824442B (en) | 2024-02-13 |
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