CN101958726B - Method and device for eliminating frequency deviation through temperature compensation in WCDMA (Wideband Code Division Multiple Access) frequency selector - Google Patents
Method and device for eliminating frequency deviation through temperature compensation in WCDMA (Wideband Code Division Multiple Access) frequency selector Download PDFInfo
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- CN101958726B CN101958726B CN 200910112175 CN200910112175A CN101958726B CN 101958726 B CN101958726 B CN 101958726B CN 200910112175 CN200910112175 CN 200910112175 CN 200910112175 A CN200910112175 A CN 200910112175A CN 101958726 B CN101958726 B CN 101958726B
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Abstract
The invention discloses a method for eliminating frequency deviation through temperature compensation in a WCDMA frequency selector, wherein frequency deviation is formed due to environmental temperature change in a medium-frequency sound meter, and the N frequency-division coefficient of a phase-locking frequency-doubling circuit is controlled according to a frequency deviation quantity, so thatthe deviation quantity consistent with the medium-frequency sound meter is also generated by the output of a VCO (Voltage Controlled Oscillator) to eliminate the frequency deviation. The invention mainly discloses a device for eliminating the frequency deviation through temperature compensation in the WCDMA frequency selector, which comprises a temperature detection module, a microprocessing module and the phase-locking frequency-doubling circuit, wherein the temperature detection module is used for detecting the environmental temperature of the medium-frequency sound meter, and the microprocessing module is used for outputting a control level according to the frequency deviation quantity generated by temperature and controlling the N frequency-division coefficient in the phase-locking frequency-doubling circuit. The invention eliminates the frequency deviation in the WCDMA frequency selector by using a temperature compensation method and keeps the stability and the good communicationquality of the WCDMA frequency selector.
Description
Technical field
The present invention relates to the communications electronics technical field, particularly method and the device of temperature-compensating elimination frequency deviation in the WCDMA frequency-selector.
Background technology
At present, in known communications electronics field, for temperature-compensating this respect technology, just be used for the temperature-compensating of power amplifier final stage microwave tube, but do not making any effective measures, particularly WCDMA frequency-selector aspect aspect the frequency-selector frequency shift (FS).
WCDMA choosing band be with wide and suppress sideband requires height, suppress sideband is high is conducive to the filtering of opposite side band stray signal and the amplification of efficient communication signal, can avoid like this useful signal because band bending and by filtering or weakening.The suppress sideband performance of the bias effect frequency-selector of frequency, thus communication quality affected, cause the weakening of useful signal and the amplification of unwanted signal.
The components and parts of selecting in frequency-selector are intermediate frequency sound table, are generally the piezoelectrics such as quartz crystal, piezoelectric ceramic and intermediate frequency sound table adopts.Be subjected to very much the impact of temperature due to the characteristic of quartz crystal, cause center frequency point and the bandwidth offset of intermediate frequency sound table, and self directly the method for serviceability temperature compensation revised.This becomes in frequency-selector the difficult problem that can't solve with temperature-compensating.
Given this, the inventor conscientiously studies and tests this field, finally designs method and the device of temperature-compensating elimination frequency deviation in a kind of suitable WCDMA frequency-selector, and this case produces thus.
Summary of the invention
The object of the present invention is to provide method and the device of temperature-compensating elimination frequency deviation in the WCDMA frequency-selector, the intermediate frequency sound table of eliminating frequency-selector produces the problem of center frequency point and passband skew because of temperature, make the frequency-selector working stability effective.
In order to achieve the above object, solution of the present invention is:
In the WCDMA frequency-selector, the method for frequency deviation is eliminated in temperature-compensating, detects the ambient temperature of intermediate frequency sound table; Obtain corresponding amount of frequency compensation according to the temperature data that detects; By the controlled level of amount of frequency compensation, change the Fractional-N frequency coefficient of frequency divider in phase-locking frequency multiplication circuit with control level, control the initial control level of voltage controlled oscillator VCO in phase-locking frequency multiplication circuit, change the output frequency of voltage controlled oscillator VCO, make the output frequency of VCO consistent with the centre frequency of intermediate frequency sound table, eliminate the frequency deviation that intermediate frequency sound table produces because of temperature.
In the WCDMA frequency-selector, the device of frequency deviation is eliminated in temperature-compensating, comprises following modules and circuit,
Temperature detecting module, for detection of the ambient temperature of intermediate frequency sound table, its output level represents relevant temperature;
Micro treatment module is used for receiving the output level that temperature detecting module sends, and obtains corresponding amount of frequency compensation according to output level, and respective frequencies compensation rate output control level, controls the Fractional-N frequency coefficient of frequency divider in phase-locking frequency multiplication circuit.
Phase-locking frequency multiplication circuit is used for obtaining an output frequency consistent with intermediate frequency sound table centre frequency, and in phase-locking frequency multiplication circuit, the Fractional-N frequency coefficient of frequency divider is controlled by micro treatment module, thereby adjusts output frequency.
After adopting such scheme, the present invention can be by the variations in temperature of intermediate frequency sound table, correspondence obtains a control level, change phase-locking frequency multiplication circuit Fractional-N frequency ordinal number, thereby make the voltage controlled oscillator VCO output frequency side-play amount of phase-locking frequency multiplication circuit consistent with the frequency offset of intermediate frequency sound table, thereby eliminate the frequency deviation of frequency-selector.
Description of drawings
Fig. 1 is module diagram of the present invention;
Fig. 2 is the module diagram of phase-locking frequency multiplication circuit in the present invention;
Fig. 3 is the circuit diagram of phase-locking frequency multiplication circuit in the present invention;
Fig. 4 is temperature and output level contrast figure in temperature detecting module of the present invention;
Fig. 5 is the connecting circuit figure of temperature detecting module of the present invention.
Embodiment
Below in conjunction with Fig. 1, Fig. 2 and Fig. 3 to the present invention to describing in further detail.
The output level of temperature detecting module 5 is passed to micro treatment module 6.Stored the frequency offset of intermediate frequency sound table 2 with variation of ambient temperature in micro treatment module 6, namely amount of frequency compensation.The temperature range of amount of frequency compensation is from 0 ℃ to 100 ℃, can gather a point by every 5 ℃, stores altogether 21 data.The typical temperature scope can only be selected 25 ℃ to 75 ℃, within the ambient temperature of intermediate frequency sound table 2 is in this scope substantially.Corresponding to amount of frequency compensation, micro treatment module 6 is provided with corresponding one group of control level.Receive an output level of temperature detecting module 5 when micro treatment module 6, can obtain this output level and represent an amount of frequency compensation under actual temperature from memory, then the corresponding control level of corresponding this amount of frequency compensation output.
In order to prevent the frequently compensation between point of interface of each temperature, adopt the method for two dynamic thresholds in micro treatment module 6.When temperature is point of interface and is in intensification trend, the temperature value that the Xiamen of temperature is limited to point of interface subtracts 1; When temperature is point of interface and is in cooling trend, the temperature value that is limited to point of interface of visiting of temperature adds 1.
The control level of output is for controlling phase-locking frequency multiplication circuit 4 Fractional-N frequency coefficients in micro treatment module 6.In conjunction with Fig. 2 and Fig. 3, phase-locking frequency multiplication circuit 4 comprises phase discriminator 41, low pass filter 42, voltage controlled oscillator VCO 43 and frequency divider 44.The amplitude that the feedback signal that phase discriminator 41 is used for judgement crystal oscillator signal and reception differs, phase discriminator 41 outputs are by low pass filter 42, filtering, filtering is due to the variation and the impact of other destabilizing factors on whole module of data, obtain a locking output by voltage controlled oscillator VCO 43 again, voltage controlled oscillator 43 outputs are also by after frequency divider 44N frequency division, and one feeds back signal to phase discriminator 41 the most.
Phase discriminator 41 one the tunnel is wherein the crystal oscillator OSC of 12.8MHz, and input pin is OSC
in8, carry out the R frequency division, another road is the feedback signal of voltage controlled oscillator VCO 43, input pin is f
IN6, carry out Fractional-N frequency.The R divide ratio is fixed, and the Fractional-N frequency coefficient is can be by outside input control.Therefore, the control level of micro treatment module 6 outputs in the present invention is exactly in order to control the Fractional-N frequency coefficient, and the Fractional-N frequency coefficient changes, and makes the pore level of voltage controlled oscillator VCO 43 change, and the locking output of final voltage controlled oscillator VCO 43 also will be offset.The frequency offset that the side-play amount that keeps locking output and intermediate frequency sound table are corresponding is consistent, passes through like this down-conversion mixer 1 and upper frequency mixer 3 mixing in Fig. 1, and the frequency offset in intermediate frequency sound table 2 is compensated.Therefore, WCDMA frequency-selector frequency deviation is eliminated, and guarantees good communication quality.
Claims (2)
1. in a WCDMA frequency-selector, the method for frequency deviation is eliminated in temperature-compensating, it is characterized in that: temperature detecting module detects the ambient temperature of intermediate frequency sound table, obtain an output level, this output level represents the ambient temperature of actual detection, and the output level of temperature detecting module is passed to micro treatment module, micro treatment module receives the output level that temperature detecting module sends, and obtains corresponding amount of frequency compensation according to output level, and respective frequencies compensation rate output control level, controls the Fractional-N frequency coefficient of frequency divider in phase-locking frequency multiplication circuit, phase-locking frequency multiplication circuit comprises phase discriminator, low pass filter, voltage controlled oscillator VCO and frequency divider, the amplitude that phase discriminator differs for the feedback signal that judges crystal oscillator signal and reception, phase discriminator output is by low pass filter filtering, obtain a locking output by voltage controlled oscillator VCO again, voltage controlled oscillator output is also by feeding back signal to phase discriminator as one after the frequency divider Fractional-N frequency, phase discriminator one the tunnel is wherein the crystal oscillator OSC of 12.8MHz, carry out the R frequency division, another road is the feedback signal of voltage controlled oscillator VCO, carry out Fractional-N frequency, the R divide ratio is fixed, and the Fractional-N frequency coefficient is to be controlled by micro treatment module, the control level of micro treatment module output is controlled the Fractional-N frequency coefficient exactly, change the Fractional-N frequency coefficient of frequency divider in phase-locking frequency multiplication circuit, make the initial control level of voltage controlled oscillator VCO in phase-locking frequency multiplication circuit change, the also skew of locking output of final voltage controlled oscillator VCO, the frequency offset that the side-play amount that keeps locking output and intermediate frequency sound table are corresponding is consistent, by down-conversion mixer and upper frequency mixer mixing, frequency offset in intermediate frequency sound table is compensated, eliminate the frequency deviation that intermediate frequency sound table produces because of temperature.
2. in a WCDMA frequency-selector, the device of frequency deviation is eliminated in temperature-compensating, it is characterized in that: comprise following modules and circuit,
Temperature detecting module, for detection of the ambient temperature of intermediate frequency sound table, its output level represents relevant temperature;
Micro treatment module is used for receiving the output level that temperature detecting module sends, and obtains corresponding amount of frequency compensation according to output level, and respective frequencies compensation rate output control level, controls the Fractional-N frequency coefficient of frequency divider in phase-locking frequency multiplication circuit;
phase-locking frequency multiplication circuit, comprise phase discriminator, low pass filter, voltage controlled oscillator VCO and frequency divider, the amplitude that phase discriminator differs for the feedback signal that judges crystal oscillator signal and reception, phase discriminator output is by low pass filter filtering, obtain a locking output by voltage controlled oscillator VCO again, voltage controlled oscillator output is also by feeding back signal to phase discriminator as one after the frequency divider Fractional-N frequency, phase discriminator one the tunnel is wherein the crystal oscillator OSC of 12.8MHz, carry out the R frequency division, another road is the feedback signal of voltage controlled oscillator VCO, carry out Fractional-N frequency, the R divide ratio is fixed, and the Fractional-N frequency coefficient is to be controlled by micro treatment module, in phase-locking frequency multiplication circuit, the Fractional-N frequency coefficient of frequency divider is controlled by micro treatment module, change the Fractional-N frequency coefficient of frequency divider in phase-locking frequency multiplication circuit, make the initial control level of voltage controlled oscillator VCO in phase-locking frequency multiplication circuit change, the also skew of locking output of final voltage controlled oscillator VCO, the frequency offset that the side-play amount that keeps locking output and intermediate frequency sound table are corresponding is consistent, by down-conversion mixer and upper frequency mixer mixing, frequency offset in intermediate frequency sound table is compensated, thereby adjustment output frequency.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 200910112175 CN101958726B (en) | 2009-07-13 | 2009-07-13 | Method and device for eliminating frequency deviation through temperature compensation in WCDMA (Wideband Code Division Multiple Access) frequency selector |
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| CN 200910112175 CN101958726B (en) | 2009-07-13 | 2009-07-13 | Method and device for eliminating frequency deviation through temperature compensation in WCDMA (Wideband Code Division Multiple Access) frequency selector |
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| CN101958726B true CN101958726B (en) | 2013-06-05 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1705222A (en) * | 2004-06-03 | 2005-12-07 | 电子科技大学 | Temperature-compensating method for quartz crystal oscillator |
| CN1937410A (en) * | 2006-08-17 | 2007-03-28 | 复旦大学 | Adaptive process and temperature compensated high frequency ring-oscillating phase-locking ring circuit |
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| KR100254517B1 (en) * | 1997-12-29 | 2000-05-01 | 서정욱 | Periodic beacon signal generator for cdma base station |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1705222A (en) * | 2004-06-03 | 2005-12-07 | 电子科技大学 | Temperature-compensating method for quartz crystal oscillator |
| CN1937410A (en) * | 2006-08-17 | 2007-03-28 | 复旦大学 | Adaptive process and temperature compensated high frequency ring-oscillating phase-locking ring circuit |
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