CN101714872A - Temperature compensation system and method of sound surface wave frequency device - Google Patents
Temperature compensation system and method of sound surface wave frequency device Download PDFInfo
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- CN101714872A CN101714872A CN200910220932A CN200910220932A CN101714872A CN 101714872 A CN101714872 A CN 101714872A CN 200910220932 A CN200910220932 A CN 200910220932A CN 200910220932 A CN200910220932 A CN 200910220932A CN 101714872 A CN101714872 A CN 101714872A
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Abstract
The invention discloses a temperature compensation system and a temperature compensation method of a sound surface wave frequency device, which comprises a temperature sensor, a temperature compensation circuit and an oscillator core connected with a sound surface wave material, wherein the temperature compensation circuit may be a digital compensation circuit or an analog compensation circuit, can be integrated on one or more integrated circuit chips and stores information such as a look-up table and storage control signal-temperature relation curve. The invention also discloses a method for compensating for the temperature of the sound surface wave frequency device. In the method, temperature information, detected by the temperature sensor, of the frequency device is transmitted to the temperature compensation circuit, and the temperature compensation circuit looks up the look-up table and generates a control signal corresponding to a temperature signal to control at least one variable capacitor in an adjustable capacitor library in the oscillator core to adjust the frequency of the frequency device and make the frequency stabilized at nominal frequency. The system and the method can effectively calibrate the temperature characteristic of the sound surface wave frequency device, improve frequency stability and have the advantages of high frequency and low-phase noises.
Description
Technical field
The present invention relates to a kind of frequency control device, relate in particular to the system and method that sound surface wave frequency device is carried out temperature-compensating based on surface acoustic wave.
Background technology
FREQUENCY CONTROL (comprising that frequency produces) device is must obligato element in most of electronic systems.Frequency control device is made of oscillator usually, the wherein modal crystal oscillator that is to use quartz crystal to constitute.What have in the oscillator controls the frequency of crystal oscillator with applied voltage, forms VCXO (VCXO, Voltage Compensated Crystal Oscillator); What have has a temperature-compensating, forms temperature compensating crystal oscillator (TCXO, Temperature Compensated CrystalOscillator).
Though the temperature compensating crystal oscillator temperature stability is better, production cost is higher.In addition, we compare existing several high-end oscillators on the market: the output frequency of anti-platform crystal oscillator is lower, and between 100～250MHz, and manufacturing cost is higher; The phase noise of phase locked loop oscillator is bigger, and power consumption is higher; Other performances of surface acoustic wave are all better, but temperature stability is relatively poor, generally+/-level of 100ppm.
SAW (Surface Acoustic Wave) oscillator is a kind of high stable, low noise oscillation source, is the FREQUENCY CONTROL element with SAW (SurfaceAcoustic Wave) device.Surface acoustic wave is the mechanical wave of propagating on the piezoelectric crystal surface.The SAW (Surface Acoustic Wave) device volume that adopts microelectric technique to make is little in light weight, is easy to large-scale production.Surface acoustic wave (SAW) oscillator has lower shake and phase noise as the frequency source device than overtone crystal resonator, has special advantages in high-frequency circuit is used, and application is very wide.The SAW (Surface Acoustic Wave) oscillator frequency range is 250～1200MHz, be to be used for the best material of high-frequency generator now to select, yet its relatively poor temperature stability has limited it and has been used in widely among the high frequency crystal oscillator.For example, it is from-40 ℃ to+85 ℃ that most of client's working temperature requires, but the SAW oscillator can only be supported-20 ℃ to+70 ℃.
Go back at present neither one can have simultaneously high-frequency, high stability (＜+/-20ppm) and frequency device and its implementation of low phase noise.
Summary of the invention
The technical problem to be solved in the present invention is: at the deficiencies in the prior art, a kind of temperature compensation system and method for sound surface wave frequency device are provided, improve the temperature stability of SAW device, just can be possessed simultaneously high-frequency, high stability (＜+/-20ppm), low phase noise, volume be little, the sound surface wave frequency device of characteristics cheaply.
Technical scheme of the present invention is: the temperature compensation system that the present invention proposes a kind of sound surface wave frequency device, comprise temperature sensor, temperature-compensation circuit, and the oscillator that links to each other with surface acoustic wave material nuclear, described oscillator nuclear comprises the tunable capacitor storehouse, contain at least one variable capacitance, store look-up table in the memory of described temperature-compensation circuit, comprise control signal-temperature relation information or frequency signal-temperature relation information.
The more detailed technical scheme of the temperature compensation system of sound surface wave frequency device of the present invention is:
Described temperature-compensation circuit can be analog temperature compensation circuit or digital temperature compensating circuit, or contains the temperature-compensating subsystem of microprocessor; When being the digital temperature compensating circuit, between digital temperature compensating circuit and temperature sensor, be connected with analog-digital converter, the analog signal conversion that temperature sensor is exported is a digital signal, exports to the digital temperature compensating circuit then; The control signal of digital temperature compensating circuit output is directly controlled the variable capacitance in the tunable capacitor storehouse, perhaps digital signal is converted to analog signal by digital analog converter after, control variable capacitance again.
Further, described analog temperature compensation circuit links to each other with the tunable capacitor storehouse after connecting a filter again.
Variable capacitance in the described variable capacitance storehouse can be accepted the control of digital signal or analog signal, current signal or voltage signal.
Described system can utilize integrated circuit technique, is produced on among chip piece or the chip more than.
The invention allows for a kind of temperature compensation of sound surface wave frequency device, comprise the steps:
Step S1: the temperature information of the frequency device that records is passed to temperature-compensation circuit by temperature sensor;
Step S2: the look-up table that is stored in the temperature-compensation circuit or other and the corresponding information of temperature are consulted by system, produce control signal, are used for the capacitance of at least one variable capacitance in the tunable capacitor storehouse of control generator nuclear;
Step S3: the frequency of variable capacitance regulating frequency device makes frequency stabilization in nominal frequency.
The more detailed technical scheme of the temperature compensation of sound surface wave frequency device of the present invention is:
There is look-up table in the described temperature-compensation circuit, adopt the controlled signal value of pre-distortion method, at first under the different temperatures in oscillator serviceability temperature scope, by temperature-compensation circuit output control signal, change the capacitance of variable capacitance in the tunable capacitor storehouse, make output frequency be stabilized in nominal frequency, the control signal value when writing down each temperature respectively then, controlled signal-temperature relation information, and be stored in the look-up table.
Described temperature-compensation circuit has look-up table, adopts the controlled signal value of frequency correction method, and the frequency response of at first measuring the frequency device under the different temperatures obtains the relation information of frequency f and temperature, obtains nominal frequency f then
cWith the synthermal relation information of the difference frequency of frequency f, be emending frequency information, under the different temperatures in oscillator serviceability temperature scope, by temperature-compensation circuit output control signal, change the capacitance of variable capacitance in the tunable capacitor storehouse, make output frequency be tending towards the emending frequency of this temperature, the control signal value when writing down each temperature, controlled signal-temperature relation information is stored in the look-up table.
Described temperature-compensation circuit directly obtains the control signal value of relevant temperature by look-up table, perhaps the control signal in the look-up table-temperature relation information is carried out in full section or the different temperatures scope segmentation and adopt zeroth order, single order, second order, multistage function match or interpolation method to obtain required control signal.
Further, can proofread and correct calibration again and obtain control signal-temperature relation table or frequency-temperature signal table, and coefficient correlation, be stored in the look-up table of temperature-compensation circuit.
Advantage of the present invention is: temperature compensation system and method that the present invention adopts, can effectively proofread and correct the temperature characterisitic of sound surface wave frequency device, adopt sound surface wave frequency device after the temperature compensation system can improve frequency stability to＜+/-the following level of 20ppm, have the advantage of high-frequency and low phase noise simultaneously, and be suitable for being integrated in the integrated circuit (IC) chip or the control of employing microprocessor.
Description of drawings
Below in conjunction with drawings and Examples the present invention is further described:
Fig. 1 is the systematic schematic diagram of embodiments of the invention 1;
Fig. 2 is the frequency-temperature relation curve synoptic diagram of embodiments of the invention;
Fig. 3 is the emending frequency curve synoptic diagram of embodiments of the invention;
Fig. 4 carries out frequency-temperature relation curve synoptic diagram after the temperature-compensating for embodiments of the invention;
Fig. 5 is the systematic schematic diagram of embodiments of the invention 2;
Fig. 6 is the systematic schematic diagram of embodiments of the invention 3;
Fig. 7 is the systematic schematic diagram of embodiments of the invention 4;
Fig. 8 is the systematic schematic diagram of embodiments of the invention 5;
Fig. 9 is the systematic schematic diagram of embodiments of the invention 6.
Wherein: 1 surface acoustic wave material; 2 oscillators nuclear; 3 temperature sensors; 4 temperature-compensation circuits; 5 tunable capacitor storehouses; 40 digital temperature compensating circuits; 401 analog-digital converters; 402 digital analog converters; 41 analog temperature compensation circuit; 411 filters; 42 contain the temperature-compensating subsystem of microprocessor.
Embodiment
Design object of the present invention is to utilize the inherent advantage of SAW (Surface Acoustic Wave) oscillator, utilize temperature compensation system to solve the problem of its temperature stability difference, obtain high-frequency, high-precision SAW oscillator, the temperature stability of SAW after the compensation and the temperature coefficient of quartz crystal are approaching, and reach＜+/-level of 20ppm.Key technical problem is to design the temperature-compensating mechanism that is suitable for the SAW device in chip.Different with temperature compensating crystal oscillator, temperature compensation system cost of the present invention is lower, and manufactory does not need high equipment investment.
Embodiment 1: as shown in Figure 1, the temperature compensation system of embodiments of the invention 1 comprises temperature sensor 3, temperature-compensation circuit 4, and the oscillator that links to each other with surface acoustic wave material 1 nuclear 2, wherein, oscillator nuclear 2 comprises a tunable capacitor storehouse 5, comprises a variable capacitance at least.Variable capacitance in the described variable capacitance storehouse can be accepted the control of digital signal or analog signal, current signal or voltage signal, can select matching used tunable capacitor according to used temperature-compensation circuit.By temperature sensor 3 temperature information of the frequency device that records is passed to temperature-compensation circuit 4.Temperature sensor 3 adopts semiconductor PN node diode, also can adopt other temperature-sensing element (device)s or circuit.Temperature-compensation circuit 4 output control signals are regulated the capacitance of the variable capacitance in the tunable capacitor storehouse, when the capacitance variation of tunable capacitor, causing the variation of the output frequency of vibration nuclear.The control signal of temperature-compensation circuit 4, by consulting control signal-temperature relation information or the frequency-temperature signal relation information in the look-up table that is stored in temperature-compensation circuit 4, and obtain through curve fit and interpolation, the output frequency of vibration nuclear can be stabilized on the nominal frequency of frequency device.
In the memory of temperature-compensation circuit 4, (Look Up Table LUT), records N different temperatures and N corresponding different control signals, i.e. control signal-temperature relation table, and other information to a look-up table of storage.Control signal can be current signal, also can be voltage signal, exports to tunable capacitor storehouse 5 by temperature-compensation circuit 4.Look-up table can be stored in the memories such as register, internal memory or in the algorithm software in the microprocessor.In temperature-compensation circuit 4 courses of work, table look-up and obtain the numerical value of the required control signal of corresponding temperature information through the method for curve fit and interpolation by use.
The control signal of temperature-compensation circuit 4 outputs can be obtained by multiple algorithm, comprising: pre-distortion method and frequency correction method, will introduce one by one below.
Pre-distortion method: by temperature-compensation circuit 4 output control signals, control signal can be current signal, also can be voltage signal, change the capacitance of variable capacitance in the tunable capacitor storehouse, make output frequency be tending towards the nominal frequency of frequency device, the control signal value when writing down this temperature value lower frequency and reaching nominal frequency, and test respectively under the different temperatures in oscillator serviceability temperature scope, controlled signal-temperature relation curve, i.e. control signal-temperature relation table.If continuously change the required control signal of temperature survey, continuous temperature function that then can controlled signal, control signal-temperature relation curve is a level and smooth curve.But more general situation is different discrete temperature spot (T1, the T2 of the N in the normal serviceability temperature scope of a measuring oscillator, T3 ..., Tn), and corresponding control signal (C1, C2, C3, ..., Cn), the discrete temperature funtion of controlled signal, control signal-temperature relation curve is the straight line of a segmentation, the discrete temperature spot of being surveyed is many more, the approaching more level and smooth curve of the control signal of segmentation-temperature relation curve.
The frequency correction method: at first measure the frequency response of the frequency device under the different temperatures, obtain as shown in Figure 2 frequency f and the relation curve of temperature, obtain nominal frequency f then
cWith the synthermal relation curve of the difference frequency of frequency f, it is the emending frequency curve, as shown in Figure 3, under the different temperatures in the normal serviceability temperature scope of oscillator, by temperature-compensation circuit 4 output control signals, change the capacitance of variable capacitance in the tunable capacitor storehouse 5, make the change amount of output frequency be tending towards the emending frequency of this temperature, thereby make total output frequency (corresponding to the change amount sum of the former output frequency and the output frequency of temperature) be tending towards nominal frequency, as shown in Figure 4.
Control signal-temperature relation curve or frequency signal-temperature relation information that temperature-compensation circuit 4 is directly looked in the look-up table obtain the control signal value of relevant temperature, but for being in two adjacent discrete temperature spot T
iAnd T
I+1Between temperature, can only get the control signal value (C on these two adjacent discrete temperature spots
iAnd C
I+1) one of as the control signal value on the temperature between the adjacent discrete temperature spot, i.e. zeroth order match.More accurate way is that control signal-temperature relation curve is carried out curve fitting and the next controlled signal value of interpolation.Curve fit can be single order, second order or multistage match.In system and circuit realization, also can in different temperature ranges, segmentation adopt zeroth order, single order, second order and multistage function match or interpolation method to obtain desired signal.
For the single order match, can adopt 3 matches, required signal value can be expressed as:
T wherein
iBe temperature, S
iIt is temperature T
iThe time desired signal, S
iCan be control signal C
i, also can be the frequency f of frequency device
i, also can be emending frequency f
c-f
iThe single order match also can be adopted other linear multi-point fitting modes.The linear multi match is more accurate than 3 matches, and count and get many more accurate more, but also can make algorithm and side circuit more complicated.
The second order match can be adopted following function:
Wherein, T
0And S
0Be respectively the temperature value and the signal value of the knee of curve in desired signal-temperature curve, measure two class values, then can calculate coefficient A and T
0Value.By measuring more class values and being averaged, can obtain the valuation of A more accurately.
The second order match can also be adopted following function:
Adopt function (3) need measure the value of 3 temperature spots at least.Equally, can also adopt three rank or more the function of high-order realize curve fit.
The control signal of temperature-compensation circuit 4 outputs changes the capacitance of one or more variable capacitance in the tunable capacitor storehouse 5, control signal can be current signal, also can be voltage signal, the output frequency that variable capacitance can the regulating frequency device is stabilized on the nominal frequency frequency values.Surface acoustic wave material and oscillator nuclear be connected to prior art, repeat no more.
This temperature compensation system can be utilized integrated circuit technique, is produced on among chip piece or the chip more than, has littler volume and lower cost.In the chip production and module integrating process of the temperature compensation system of using integrated circuit (IC) chip, because certain a chip of making there are differences on individuality, perhaps because frequency device there are differences on individuality, actual frequency-temperature signal curve and control signal-temperature relation curve may be different mutually, and unified like this correction data may not reach best effect temperature compensation.For addressing this problem, can proofread and correct calibration again and obtain control signal-temperature relation table or frequency-temperature signal table, and coefficient correlation (A for example, T
0, a, b, c, or the like), be stored in the look-up table of temperature-compensation circuit 4.Need again the situation of control information to have following several:
1. after changing chip maker;
2. for the chip fabrication techniques of different process;
3. the chip of producing for different batches in the chip manufacturing proces;
4. for the wafer that is in the wafer diverse location in the chip manufacturing proces;
5. other need to proofread and correct again the situation of calibration.
Embodiment 2: the schematic diagram that is illustrated in figure 5 as the temperature compensation system of present embodiment.The temperature compensation system of present embodiment comprises temperature sensor 3, temperature-compensation circuit 4, comprises the oscillator nuclear 2 in tunable capacitor storehouse 5, and surface acoustic wave material 1 links to each other with oscillator nuclear 2.By temperature sensor 3 temperature information of the frequency device that records is passed to temperature-compensation circuit 4.Present embodiment adopts the digital compensation technology, temperature-compensation circuit is a digital temperature compensating circuit 40, between digital temperature compensating circuit 40 and temperature sensor 3, be connected with analog-to-digital conversion circuit 401, with the analog signal conversion of temperature sensor 3 outputs is digital signal, exports to digital temperature compensating circuit 40 then.Digital temperature compensating circuit 40 is by looking into the control signal that look-up table obtains this temperature signal correspondence, be used for controlling the capacitance of one or more variable capacitance in the tunable capacitor storehouse 5 that connects with the oscillator nuclear phase, thereby the frequency of regulating frequency device makes frequency values be stabilized in nominal frequency.The variable capacitance of present embodiment can be accepted the control of digital signal.Look-up table is identical with embodiment's 1, repeats no more.
Embodiment 3: for the variable capacitance that can not be subjected to Digital Signals, can connect a digital analog converter 402 in the output of digital temperature compensating circuit 40, as shown in Figure 6, be transferred to variable capacitance again after converting the digital output signal of temperature-compensation circuit 4 to analog signal earlier, its capacitance is controlled.The remainder of embodiment 3 is identical with embodiment 2
Embodiment 4: the temperature-compensation circuit 4 of present embodiment adopts analog temperature compensation circuit 41.By temperature sensor 1 temperature information of the frequency device that records is directly passed to analog temperature compensation circuit 41, the analog temperature compensation circuit produces and the temperature signal control signal corresponding, be used for controlling at least one variable capacitance in the tunable capacitor storehouse 5 that connects with the oscillator nuclear phase, thereby the frequency of regulating frequency device makes frequency keep stable.Wherein the method for analog temperature compensation circuit generation control signal is identical with the method that the digital temperature compensating circuit produces control signal, adopt pre-distortion method or the controlled signal of frequency correction method-temperature relation curve, and be stored in the look-up table, and control signal-temperature relation curve of directly looking in the look-up table by analog temperature compensation circuit 41 obtains the control signal value of relevant temperature, perhaps control signal-temperature relation curve carried out curve fitting and interpolation is come controlled signal value.Curve fit can be single order, second order or multistage match.
Embodiment 5: in order to improve the performance of temperature compensation system, the output of the analog temperature compensation circuit of embodiment 5 as shown in Figure 8 is connected with a filter 411, filter out noise signal, and then link to each other with one or more variable capacitances in the tunable capacitor storehouse 5, the remainder circuit is identical with embodiment 4.
Embodiment 6: in order to improve the performance of temperature compensation system, the analog temperature compensation circuit of embodiment 6 as shown in Figure 9 is a temperature-compensating subsystem 42, wherein includes microprocessor, can use more complicated and high-precision temperature compensation algorithm.
The above only is the preferred embodiments of the present invention, can not limit scope of the invention process with this, and all simple conversion of doing according to claim of the present invention and description all should still belong to the protection range that the present invention covers.
Claims (10)
1. the temperature compensation system of a sound surface wave frequency device, the oscillator nuclear (2) that comprises temperature sensor (3), temperature-compensation circuit (4) and link to each other with surface acoustic wave material (1), it is characterized in that: described oscillator nuclear (2) comprises tunable capacitor storehouse (5), at least contain a variable capacitance, store look-up table in the memory of described temperature-compensation circuit (4), comprise control signal-temperature relation information or frequency signal-temperature relation information.
2. according to the temperature compensation system of the sound surface wave frequency device described in the claim 1, it is characterized in that: described temperature-compensation circuit (4) can be analog temperature compensation circuit (41) or digital temperature compensating circuit (40), or contains the temperature-compensating subsystem (42) of microprocessor; When being digital temperature compensating circuit (40), between digital temperature compensating circuit (40) and temperature sensor (3), be connected with analog-digital converter (401), the analog signal conversion that temperature sensor (3) is exported is a digital signal, exports to digital temperature compensating circuit (40) then; The control signal of digital temperature compensating circuit (40) output is directly controlled the variable capacitance in the tunable capacitor storehouse (5), perhaps digital signal is converted to analog signal by digital analog converter (402) after, control variable capacitance again.
3. according to the temperature compensation system of the sound surface wave frequency device described in the claim 2, it is characterized in that: described analog temperature compensation circuit (41) links to each other with tunable capacitor storehouse (5) after connecting a filter (411) again.
4. according to the temperature compensation system of the sound surface wave frequency device described in the claim 1, it is characterized in that: the variable capacitance in the described variable capacitance storehouse (5) can be accepted the control of digital signal or analog signal, current signal or voltage signal.
5. according to the temperature compensation system of the sound surface wave frequency device described in claim 1 or 2, it is characterized in that: described system can utilize integrated circuit technique, is produced on among chip piece or the chip more than.
6. the temperature compensation of a sound surface wave frequency device is characterized in that comprising the steps:
Step S1: the temperature information of the frequency device that records is passed to temperature-compensation circuit (4) by temperature sensor (1);
Step S2: the look-up table that is stored in the temperature-compensation circuit (4) or other and the corresponding information of temperature are consulted by system, produce control signal, are used for the capacitance of at least one variable capacitance in the tunable capacitor storehouse (5) of control generator nuclear (2);
Step S3: the frequency of variable capacitance regulating frequency device makes frequency stabilization in nominal frequency.
7. according to the temperature compensation of the sound surface wave frequency device described in the claim 6, it is characterized in that: described temperature-compensation circuit has look-up table in (4), adopt the controlled signal value of pre-distortion method, at first under the different temperatures in oscillator serviceability temperature scope, by temperature-compensation circuit (4) output control signal, change the capacitance of variable capacitance in the tunable capacitor storehouse (5), make output frequency be stabilized in nominal frequency, control signal value when writing down each temperature respectively then, controlled signal-temperature relation information, and be stored in the look-up table.
8. according to the temperature compensation of the sound surface wave frequency device described in the claim 6, it is characterized in that: described temperature-compensation circuit (4) has look-up table, adopt the controlled signal value of frequency correction method, at first measure the frequency response of the frequency device under the different temperatures, obtain the relation information of frequency f and temperature, obtain nominal frequency f then
cWith the synthermal relation information of the difference frequency of frequency f, be emending frequency information, under the different temperatures in oscillator serviceability temperature scope, by temperature-compensation circuit (4) output control signal, change the capacitance of variable capacitance in the tunable capacitor storehouse (5), make output frequency be tending towards the emending frequency of this temperature, the control signal value when writing down each temperature, controlled signal-temperature relation information is stored in the look-up table.
9. according to the temperature compensation of the sound surface wave frequency device described in the claim 6, it is characterized in that: described temperature-compensation circuit (4) directly obtains the control signal value of relevant temperature by look-up table, perhaps the control signal in the look-up table-temperature relation information is carried out in full section or the different temperatures scope segmentation and adopts zeroth order, single order, second order, multistage function match or interpolation method to obtain required control signal.
10. according to the temperature compensation of any described sound surface wave frequency device in the claim 6 to 9, it is characterized in that: can proofread and correct calibration again and obtain control signal-temperature relation table or frequency-temperature signal table, and coefficient correlation, be stored in the look-up table of temperature-compensation circuit (4).
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| CN111884589A (en) * | 2020-08-26 | 2020-11-03 | 硅谷数模(苏州)半导体有限公司 | Method and device for determining temperature compensation parameters of frequency source |
| CN111884589B (en) * | 2020-08-26 | 2021-11-05 | 硅谷数模(苏州)半导体有限公司 | Method and device for determining temperature compensation parameters of frequency source |
| CN112731790B (en) * | 2020-12-07 | 2021-12-03 | 江阴长仪集团有限公司 | Method for improving RTC (real time clock) calibration precision based on time domain segmented interpolation compensation |
| CN112731790A (en) * | 2020-12-07 | 2021-04-30 | 江阴长仪集团有限公司 | Method for improving RTC (real time clock) calibration precision based on time domain segmented interpolation compensation |
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