CN101741451B - Polarized transmitter, phase modulator and phase modulation method - Google Patents
Polarized transmitter, phase modulator and phase modulation method Download PDFInfo
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- CN101741451B CN101741451B CN 200810177690 CN200810177690A CN101741451B CN 101741451 B CN101741451 B CN 101741451B CN 200810177690 CN200810177690 CN 200810177690 CN 200810177690 A CN200810177690 A CN 200810177690A CN 101741451 B CN101741451 B CN 101741451B
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Abstract
The invention relates to a polarized transmitter, in particular to a phase modulator and a phase modulation method which are applied to the polarized transmitter. The polarized transmitter, the phase modulator, and the phase modulation method increase a phase modulation range through a 180-degree phase switcher and select an appropriate oversampling rate to ensure that a capacitor array used for overcoming process migration, voltage deviation and temperature drift in numerically controlled oscillators can also be used to provide signals of multi-phase change. Meanwhile, auxiliary phase error correction is adopted to increase the accuracy of phase modulation.
Description
Technical field
The invention relates to polar transmitter, in particular to the phase modulator and the phase modulation method that are applied in the polar transmitter.
Background technology
The radiofrequency launcher (RF transmitter) of polarization (Polar) framework is one of important technology of in recent years wireless telecommunications development, because it is easier to the usefulness of holding power amplifier (power amplifier).But polar architectures is polarization (amplitude/phase) signal with quadrature (I/Q) signal transition of original limited frequency range, and the amplitude (amplitude) of polarization just can be kept the former quality that transmits with the great frequency range of phase place (phase) signal demand in theory.Can increase the problem of error vector magnitude (error vector magnitude, EVM) and generation spectral growth (spectral regrowth) when the use frequency range of restriction amplitude and phase signal.Therefore how finding out succinct, the effective method of a capable of regulating frequency range, increase the use amount of frequency range, is the problem that industry utmost point wish solves.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of polar transmitter and is applied to phase modulator and phase modulation method in the polar transmitter, phase switchers by 180 degree to be promoting the scope of phase modulation, and the capacitor array (capacitor array) of selecting suitable mistakes sampling rate (over sampling rate) to make originally in the digital control type oscillator, to be used for overcoming technique, voltage and temperature drift but dual-purpose provides the signal of leggy variation.Be aided with simultaneously the correction of phase error, to improve the accuracy of phase modulation.
One of embodiments of the invention are a kind of phase modulators, can be used for polar transmitter, produce according to a phase sample to have the radiofrequency signal that phase place changes.Wherein comprise a loop control unit, can be according to a reference frequency, this phase sample and this radiofrequency signal to determine a target frequency value.Then, a logic control element produces a vibration regulation and control word according to this target frequency value.This vibration regulation and control word is sent to a digital oscillator, to produce surely radiofrequency signal.This digital oscillator has a modulation limit of power, for negative 90 degree are spent to positive 90.After this accurate radiofrequency signal processing through a phase switcher, namely produce the radiofrequency signal with target frequency value.This phase switcher can according to a switching signal, should accurate radiofrequency signal be jumped turnback according to circumstances.
When this target frequency value surpasses this modulation limit of power, this logic control element produces this vibration regulation and control word according to the residual value of these target frequency value deduction 180 degree, and send all and change signal to this phase switcher, make this accurate radiofrequency signal jump turnback with synthetic this radiofrequency signal with this target frequency value.Relatively, when this target frequency value is no more than this modulation limit of power, this logic control element directly produces this vibration regulation and control word according to this target frequency value, and this phase switcher is directly exported this radiofrequency signal that has this target frequency value with synthetic with this accurate radiofrequency signal.
Another embodiment of the present invention is to adopt the polar transmitter of above-mentioned phase modulator.Wherein except comprising above-mentioned phase modulator, also comprise a polarization processor, in order to this fundamental frequency signal is converted to an amplitude sample and a phase sample, one amplitude modulation device is according to this amplitude Sample producing one amplitude adjustment signal, and one digital power amplifier receive this amplitude adjustment signal, this radiofrequency signal amplified and send.
Another embodiment of the present invention is to utilize the phase modulation method of above-mentioned phase modulator.This phase modulation method is used for a polar transmitter, produces according to a phase sample to have the radiofrequency signal that phase place changes, and comprises: this radiofrequency signal and a reference frequency and this phase sample are compared to determine a target frequency value; Produce a vibration regulation and control word according to this target frequency value; Provide that to have a modulation limit of power be a digital oscillator between one first angle to the second angle, in order to produce surely radiofrequency signal according to this vibration regulation and control word; When this target frequency value surpassed this modulation limit of power, the residual value of spending according to this target frequency value deduction 180 produced this vibration regulation and control word, and makes this accurate radiofrequency signal jump turnback with synthetic this radiofrequency signal with this target frequency value; And when this target frequency value is no more than this modulation limit of power, directly produces this vibration regulation and control word according to this target frequency value, and make this accurate radiofrequency signal directly export this radiofrequency signal that has this target frequency value with synthetic.Detailed invention details will describe in detail in execution mode.
The present invention is with respect to known way, and the method for jumping turnback can reduce the phase error that the leggy switch causes, and also can make the lower digital oscillator of modulation ability reach the result of larger phase modulation.
Description of drawings
Fig. 1 is the Organization Chart of a polar transmitter;
Fig. 2 is the embodiment of phase modulator among Fig. 1;
Fig. 3 a is the embodiment of thermometer-code encoder;
Fig. 3 b is the embodiment of capacitor array in the digital oscillator;
Fig. 4 is the embodiment of phase switcher;
Fig. 5 is the flow chart of phase modulation method of the present invention;
Fig. 6 is the flow chart that determines vibration regulation and control word.
[main element symbol description]
100 polar transmitter
110 polarization processors
120 amplitude modulation devices
130 phase modulators
140 digital power amplifiers
210 loop control units
220 logic control elements
230 thermometer-code encoders
240 digital oscillators
250 phase switchers
302 buffers
310 first encoders
320 second encoders
330 the 3rd encoders
340 delta-sigma modulation devices
312,322,332 buffers
350 capacitor arrays
402 first multiplexers
404 second multiplexers
Embodiment
The following example specific description realizes the present invention such as how better mode.The mode that embodiment only generally uses for explanation, but not in order to limit scope of the present invention.Actual range is as the criterion so that claim is listed.
Fig. 1 is the Organization Chart of general polar transmitter, and phase modulation method proposed by the invention is based on the improvement that this framework produces.In polar transmitter 100, the fundamental frequency signal of wanting externally to send is divided into quadrature two-way (representing with I, Q) usually, is sent to a polarization processor 110 with a specific data transmission rate (data rate).This polarization processor 110 can carry out the Coordinate Conversion computing, and this fundamental frequency signal is polarized to an amplitude sample A and a phase sample F.Amplitude sample A can be sent to an amplitude modulation device 120, through producing an amplitude adjustment signal α after the modulation.And phase sample F can be sent to a phase modulator 130, has the radiofrequency signal ω that phase place changes through producing after the modulation.Send after this radiofrequency signal ω being amplified according to this amplitude adjustment signal α by a digital power amplifier 140 at last.In general, for good transmission quality is provided, phase modulator 130 must possess sufficiently high sampling frequency, and calibrates accurately phase error.
Fig. 2 is the embodiment of phase modulator 130 among Fig. 1.Phase modulator 130 is a digitized phase-locked loop basically, the radiofrequency signal P of output
OUTFeedback return phase sample DATA, wireless channel CHANNEL and reference frequency F with input
REFReciprocation is to reach accurate output.At first, a loop control unit 210 is according to reference frequency F
REF, phase sample DATA and radiofrequency signal P
OUTTo determine a target frequency value P
DATABetter, this loop control unit 210 also can further be regulated and control words (CHANNEL) to determine this target frequency value with reference to the channel frequency of a wireless channel.Follow by a logic control element 220 according to this target frequency value P
DATAProduce a vibration regulation and control word (Oscillation TuningWord; OTW), in order to a control digital oscillator 240 thereafter.Basically phase sample DATA is the information that is provided by polarization processor 110, and wireless channel CHANNEL is the value that determines according to different application field and communication standard.Reference frequency F
REFBe the reference data of general phase-locked loop indispensability, therefore detailed description repeats no more.
In the present embodiment, the modulation limit of power of this digital oscillator 240 is modulated to negative 90 degree especially to positive 90 degree, wherein comprises a plurality of Capacitance parallel connections, can produce surely radiofrequency signal P according to this vibration regulation and control word
DCOSay that further the modulation limit of power of this digital oscillator 240 can be between one first angle and one second angle, and this first angle and this second angle differ 180 degree.The radiofrequency signal P that changes in order to produce large phase place
OUT, and reduce phase error, and the present invention proposes a kind of phase switcher 250, couples this digital oscillator 240 and this logic control element 220, and can switch signal #SW according to one according to circumstances should accurate radiofrequency signal P
DCOJump turnback.
This switching signal #SW is actually by logic control element 220 and judges target frequency value P
DATASize determine.For instance, because the modulation limit of power of digital oscillator 240 fixes on negative 90 degree between positive 90 degree, if target frequency value P
DATAWhen surpassing this modulation limit of power, digital oscillator 240 can't directly produce corresponding target frequency value P
DATARadiofrequency signal P
OUTIn order to reach this purpose, this logic control element 220 produces this vibration regulation and control word according to the residual value of these target frequency value deduction 180 degree first, makes digital oscillator 240 produce first the interior accurate radiofrequency signal P of a modulation limit of power
DCOThis logic control element 220 sends a switching signal #SW to this phase switcher 250 simultaneously, makes this phase switcher 250 accurate radiofrequency signal jumping turnback have this target frequency value P to synthesize
DATAThis radiofrequency signal P
OUT
Relative, as this target frequency value P
DATAWhen being no more than this modulation limit of power, this logic control element 220 directly produces this vibration regulation and control word and drives this digital oscillator 240, the accurate radiofrequency signal P that produces
DCOThen do not need again redirect, be directly output as this radiofrequency signal P
OUTIn other words, the radiofrequency signal P that exports of phase switcher 250
OUT, in fact may be accurate radiofrequency signal P
DCOCombined result with phase place 180 degree.With respect to known way, the method for jumping turnback can reduce the phase error that leggy switch 250 causes.In addition, also can make the lower digital oscillator of modulation ability 240 reach larger phase modulation result.
In order to see through the accurate control figure oscillator 240 of vibration regulation and control word, the present invention also proposes the embodiment of a thermometer-code (Thermometer Code) encoder 230, delivers to numerical digit oscillator 240 after suitable arrangement is done in the position in the vibration regulation and control word again.In general, this vibration regulation and control word is a string binary value, can be categorized as a process voltage temperature (Process-Voltage-Temperature according to most important significance position order, PVT) regulation and control word, one acquisition (Acquisition, ACQ) (Track, TRK) regulation and control word followed the trail of in regulation and control word and.For instance, if comprise 24 OTW[0:23 in the vibration regulation and control word], eight the highest position OTW[16:23] be PVT regulation and control word, then eight position OTW[8:15] consisted of ACQ regulation and control word, eight minimum position OTW[0:7] then consisted of TRK regulation and control word.In the present invention, it is 8 above-mentioned equisection methods that the mode classification of three kinds of regulation and control words does not limit, and the corresponding position of different regulation and control words can be adjusted with actual demand.For instance, in 24 of this vibration regulation and control word, this PVT regulation and control word can be the first six most important significance position, and this ACQ regulation and control word be next seven position, and this TRK regulates and control word and is next 11 position again.
Basically the PVT regulation and control word that has high byte is maximum for digital oscillator 240 adjustable scopes, but its resolution is the thickest also, generally is that technique, voltage and the temperature of correcting chip are for the impact of phase modulator 130.TRK regulation and control word with low byte is minimum for digital oscillator 240 adjustable scopes, but its resolution is the thinnest also, generally is to follow the trail of carrier signal (carriersignal) to use.ACQ regulation and control word with intermediary bytes all is centre among the three for digital oscillator 240 adjustable scopes and resolution, generally is generally to determine wireless channel (channel).
Fig. 3 a is the embodiment of thermometer-code encoder 230.This thermometer-code encoder 230 couples this logic control element 220, has comprised a buffer 302, in order to receive PVT regulation and control word, ACQ regulation and control word and the TRK regulation and control word in this vibration regulation and control word.One first encoder 310 can produce one first thermometer-code PVT ' according to the part position of this PVT regulation and control word.For instance, if present embodiment is to be applied in global intercommunication microwave access (WiMAX) communication standard, each the corresponding frequency range in the PVT vibration regulation and control word is 4MHZ (2
12) to 128MHZ (2
17).This first encoder 310 can be with first three the most important significance position (that is 2 in this PVT regulation and control word
15, 2
16And 2
17) be converted to and comprise seven isobits P
1To P
7The first thermometer-code PVT ', leave in the buffer 312.In other words, each isobits in the buffer 312 can make the accurate radiofrequency signal P that digital oscillator 240 produces
DCOTransfer 32MHz.
The figure place of these the first encoder 310 conversions is selectable.Suppose that the present invention is applied in Wideband-CDMA (WCDMA) communications protocol, then this first encoder 310 can be with front four the most important significance positions in this PVT regulation and control word (namely 2
14To 2
17) be converted to this first thermometer-code that comprises 15 isobitses, leave in this buffer 312.In other words, the accurate radiofrequency signal P that each isobits of this buffer 312 can make this digital oscillator 240 produce in this example
DCOTransfer 16MHz.
Same, one second encoder 320 can produce one second thermometer-code MSB according to this ACQ regulation and control word, deposits in the buffer 322, comprises 127 isobits M
1To M
127, each isobits can make the digital oscillator 240 hundreds of KHz of fine setting or not wait to counting MHz, for example 1MHz.The scope of fine setting can optionally freely be selected, and the present invention does not limit it.Similarly, one the 3rd encoder 330 produces one the 3rd thermometer-code LSB according to the part position of this TRK regulation and control word, deposits in the buffer 332, comprises isobits L
1To L
31In Fig. 3 a, the first five the most important significance position (2 in this TRK regulation and control word
0To 2
4) be converted into the 3rd thermometer-code LSB that comprises 31 isobitses.Partial fraction position (2 in this TRK regulation and control word
-6To 2
-1), can see through a delta-sigma modulation device 340 and be converted to calibration code L
C, the parameter of digital oscillator 240 as the mark fine setting is provided.
Fig. 3 b is the embodiment of capacitor array 350 in the digital oscillator 240.Digital oscillator 240 receives the thermometer-code that thermometer-code encoder 230 produces, so that the accurate radiofrequency signal P of respective frequencies to be provided
DCO, wherein comprise a capacitor array 350, formed by a plurality of electric capacity and at least one inductance in parallel.Each electric capacity correspondence is subject to the control of an isobits and the determine switch state, and whole equivalent capacity inductance constant has just determined accurate radiofrequency signal P whereby
DCOFrequency of oscillation.In the present embodiment, the electric capacity in the capacitor array 350 can be divided into PVT group, ACQ group and TRK group, the first thermometer-code PVT ' that each corresponding diagram 3a exports, the second thermometer-code MSB and the 3rd thermometer-code LSB.Wherein the specification of the visual practical application of capacitance of each group and elasticity determine, the present invention does not limit it.
Fig. 4 is the embodiment of phase switcher 250.In general, the accurate radiofrequency signal P of digital oscillator 240 outputs
DCOBe a kind of differential wave, comprise P
DCO+ and P
DCO-(that is differing 180 degree) inverting each other.This phase switcher 250 comprises two selectors, and each couples this P simultaneously
DCO+ and P
DCO-.When this switching signal #SW is 0, phase switcher 250 with this first multiplexer 402 directly with P
DCO+ be output as P
OUT+, this second multiplexer 404 is directly with P
DCO-be output as P
OUT-.Relative, when switching signal #SW was 1, the first multiplexer 402 was selected P
DCO-become P
OUT+, and the second multiplexer 404 is selected P
DCO+ become P
OUT-.Whereby, the radiofrequency signal P that exports
OUTComprise P
OUT+ and P
OUT-, namely be the signal of one 180 degree redirect.
Fig. 5 is the flow chart of phase modulation method of the present invention.In sum, phase modulation method of the present invention can be organized into the following step.In step 501, start the phase sample DATA that phase modulator 130 begins to receive polarization.In step 503, determine target frequency value P by loop control unit 210
DATAIn step 505, this logic control element 220 is judged this target frequency value P
DATAWhether corresponding phase angle size is greater than 90 degree or less than negative 90 degree.If so, then skip to step 511, adopt phase place redirect mode complex RF signal P
OUTIf not, then skip to step 507, do not start the phase place redirect and directly produce radiofrequency signal P
OUTIn step 507, this logic control element 220 is according to target frequency value P
DATADetermine vibration regulation and control word.Say that further this thermometer-code encoder 230 regulation and control word that will vibrate is converted to thermometer-code PVT ', MSB and the LSB of different range, borrows the linear combination of these thermometer-codes to come control figure oscillator 240.In step 509, this digital oscillator 240 drives corresponding electric capacity according to the linear combination of thermometer-code PVT ', MSB and LSB, to produce accurate radiofrequency signal P
DCOThis accurate radiofrequency signal P
DCOBe directly output as immediately radiofrequency signal P
OUT
On the other hand, what carry out in step 511 is, with the mode complex RF signal P of phase place redirect
OUTAt first with target frequency value deduction 180 degree, as the generation basis of vibration regulation and control word.For instance, if the target frequency value drops on 130 degree, then deducting 180 degree rear is-50 degree.Then in step 513, namely according to the residual value of these target frequency value deduction 180 degree, for example-50 degree produces this vibration regulation and control word to this logic control element 220.In step 515, similarly be to be converted to thermometer-code PVT ', MSB and the LSB of different range via the thermometer-code encoder 230 regulation and control word that will vibrate, borrow the linear combination of these thermometer-codes to come control figure oscillator 240 to produce accurate radiofrequency signal P
DCOThen in step 517, the switching signal #SW that this phase switcher 250 sends according to logic control element 220 is with accurate radiofrequency signal P
DCOJump turnback, can synthesize the radiofrequency signal P with this target frequency value
OUT
Fig. 6 is the flow chart that determines vibration regulation and control word.Because accurate radiofrequency signal P
DCOFrequency of oscillation be the linear combination result of this PVT regulation and control word, this ACQ regulation and control word and this TRK regulation and control word, wish reduces the usage quantity of electric capacity, needs the descending value that sequentially determines the regulation and control word.As previously mentioned, the transfer scope of PVT regulation and control word is maximum, and ACQ regulation and control word takes second place, and TRK regulation and control word is minimum.In step 601, start a program with deciding step 507 and 513 described vibration regulation and control words.In step 603, at first determine the PVT regulation and control word of maximum possible according to vibration regulation and control word.Suppose that each PVT regulates and control word and can transfer 30 degree, want to reach 50 degree, can produce first the 2x30=60 degree.Then in step 605, determine the value of ACQ regulation and control word according to the difference of vibration regulation and control word and PVT regulation and control word.Because the difference of previous step gained is-10 degree, suppose that each ACQ regulation and control word can transfer 1 degree, so ACQ regulation and control word can be set and be reduced to the 10x1 degree and supply difference.The last value that can further calculate TRK regulation and control word in step 607 is supplied less error.
Although the present invention with the preferred embodiment explanation as above is understandable that the not necessarily so restriction of scope of the present invention.Relative, any is that apparent improvement is all in covering scope of the present invention based on same spirit or to the known technology person.Therefore the scope of claim must be understood in the mode of broad sense.
Claims (36)
1. a phase modulator is characterized in that, is used for polar transmitter, produces according to a phase sample to have the radiofrequency signal that phase place changes, and this phase modulator comprises:
One loop control unit, according to a reference frequency, this phase sample and this radiofrequency signal to determine a target frequency value;
One logic control element produces a vibration regulation and control word according to this target frequency value;
One digital oscillator has a modulation limit of power between one first angle to the second angle, in order to produce surely radiofrequency signal according to this vibration regulation and control word; Wherein this first angle and this second angle differ 180 degree;
One phase switcher couples this digital oscillator and this logic control element, and can switch signal according to one should accurate radiofrequency signal jump turnback; Wherein:
When this target frequency value surpasses this modulation limit of power, this logic control element produces this vibration regulation and control word according to the residual value of these target frequency value deduction 180 degree, and send all and change signal to this phase switcher, make this accurate radiofrequency signal jump turnback with synthetic this radiofrequency signal with this target frequency value; And
When this target frequency value is no more than this modulation limit of power, this logic control element directly produces this vibration regulation and control word according to this target frequency value, and this phase switcher is directly exported this radiofrequency signal that has this target frequency value with synthetic with this accurate radiofrequency signal.
2. phase modulator according to claim 1, it is characterized in that, this vibration regulation and control word comprises a process voltage temperature adjusting word, the regulation and control word followed the trail of in one acquisition regulation and control word and, this phase modulator further comprises a thermometer-code encoder, couples this logic control element, produces one first thermometer-code according to the part position of this process voltage temperature adjusting word, produce one second thermometer-code according to this acquisition regulation and control word, and produce one the 3rd thermometer-code according to the part position of this tracking regulation and control word; Wherein:
This digital oscillator comprises a plurality of electric capacity, and these a plurality of electric capacity are subject to the control of this first thermometer-code, this second thermometer-code and the 3rd thermometer-code accordingly to produce this accurate radiofrequency signal.
3. phase modulator according to claim 1 is characterized in that, this loop control unit is further regulated and control word to determine this target frequency value with reference to a channel frequency.
4. phase modulator according to claim 2 is characterized in that, this thermometer-code encoder is converted to first three the most important significance position in this process voltage temperature adjusting word this first thermometer-code that comprises seven isobitses.
5. phase modulator according to claim 4 is characterized in that, this radiofrequency signal is the global intercommunication microwave access signal, and each isobits of this first thermometer-code makes this radiofrequency signal transfer 32MHz.
6. phase modulator according to claim 2 is characterized in that, this thermometer-code encoder is converted to this first thermometer-code that comprises 15 isobitses with front four the most important significance positions in this process voltage temperature adjusting word.
7. phase modulator according to claim 6 is characterized in that, this radiofrequency signal is the Wideband-CDMA signal, and each isobits of this first thermometer-code makes this radiofrequency signal transfer 16MHz.
8. phase modulator according to claim 2 is characterized in that, this thermometer-code encoder will capture the regulation and control word and be converted to this second thermometer-code that comprises 127 isobitses, and each isobits makes this radiofrequency signal transfer 1MHz.
9. phase modulator according to claim 2 is characterized in that, the first five most important significance position that this thermometer-code encoder will be followed the trail of in the regulation and control word is converted to the 3rd thermometer-code that comprises 31 isobitses.
10. phase modulator according to claim 2 is characterized in that,
This logic control element synthesizes this target frequency value with the linear combination of this process voltage temperature adjusting word, this acquisition regulation and control word and this tracking regulation and control word; And
After determining a target frequency value, this logic control element preferentially determines the maximum possible value of this process voltage temperature adjusting word, determines the maximum possible value of this acquisition regulation and control word again, and final decision should be followed the trail of the value of regulation and control word with synthetic this target frequency value.
11. phase modulator according to claim 10, it is characterized in that this vibration regulation and control word comprises 24, this process voltage temperature adjusting word is the first six most important significance position, this acquisition regulation and control word be next seven position, is next 11 position again and should follow the trail of the regulation and control word.
12. phase modulator according to claim 1 is characterized in that, this first angle is negative 90 degree, and this second angle is positive 90 degree.
13. a polar transmitter is characterized in that, in order to a fundamental frequency signal is converted to a radiofrequency signal, comprises:
One polarization processor is converted to an amplitude sample and a phase sample with this fundamental frequency signal;
One amplitude modulation device is according to this amplitude Sample producing one amplitude adjustment signal;
One phase modulator produces this radiofrequency signal with phase place variation according to this phase sample; And
One digital power amplifier receives this amplitude adjustment signal, this radiofrequency signal is amplified and sends; Wherein this phase modulator comprises:
One loop control unit, according to a reference frequency, this phase sample and this radiofrequency signal to determine a target frequency value;
One logic control element produces a binary vibration regulation and control word according to this target frequency value;
One digital oscillator has a modulation limit of power between one first angle to the second angle, and in order to produce surely radiofrequency signal according to this vibration regulation and control word, wherein this first angle and this second angle differ 180 degree;
One phase switcher couples this digital oscillator and this logic control element, and can switch signal according to one should accurate radiofrequency signal jump turnback; Wherein:
When this target frequency value surpasses this modulation limit of power, this logic control element produces this vibration regulation and control word according to the residual value of these target frequency value deduction 180 degree, and send all and change signal to this phase switcher, make this accurate radiofrequency signal jump turnback with a synthetic radiofrequency signal with this target frequency value; And
When this target frequency value is no more than this modulation limit of power, this logic control element directly produces this vibration regulation and control word according to this target frequency value, and this phase switcher is directly exported this radiofrequency signal that has this target frequency value with synthetic with this accurate radiofrequency signal.
14. polar transmitter according to claim 13, it is characterized in that, this vibration regulation and control word comprises a process voltage temperature adjusting word, the regulation and control word followed the trail of in one acquisition regulation and control word and, this phase modulator further comprises a thermometer-code encoder, couple this logic control element, part position according to this process voltage temperature adjusting word produces one first thermometer-code, produce one second thermometer-code according to this acquisition regulation and control word, and produce one the 3rd thermometer-code according to the part position of this tracking regulation and control word; Wherein this digital oscillator comprises a plurality of electric capacity, and these a plurality of electric capacity are subject to the control of this first thermometer-code, this second thermometer-code and the 3rd thermometer-code accordingly to produce this accurate radiofrequency signal.
15. polar transmitter according to claim 13 is characterized in that, this loop control unit is further regulated and control word to determine this target frequency value with reference to a channel frequency.
16. polar transmitter according to claim 14 is characterized in that, this thermometer-code encoder is converted to first three the most important significance position in this process voltage temperature adjusting word this first thermometer-code that comprises seven isobitses.
17. polar transmitter according to claim 16 is characterized in that, this radiofrequency signal is the global intercommunication microwave access signal, and each isobits of this first thermometer-code makes this radiofrequency signal transfer 32MHz.
18. polar transmitter according to claim 14 is characterized in that, this thermometer-code encoder is converted to this first thermometer-code that comprises 15 isobitses with front four the most important significance positions in this process voltage temperature adjusting word.
19. polar transmitter according to claim 18 is characterized in that this radiofrequency signal is the Wideband-CDMA signal, each isobits of this first thermometer-code makes this radiofrequency signal transfer 16MHz.
20. polar transmitter according to claim 14 is characterized in that this thermometer-code encoder will capture the regulation and control word and be converted to this second thermometer-code that comprises 127 isobitses, each isobits makes this radiofrequency signal transfer 1MHz.
21. polar transmitter according to claim 14 is characterized in that the first five most important significance position that this thermometer-code encoder will be followed the trail of in the regulation and control word is converted to the 3rd thermometer-code that comprises 31 isobitses.
22. polar transmitter according to claim 14 is characterized in that,
This logic control element synthesizes this target frequency value with the linear combination of this process voltage temperature adjusting word, this acquisition regulation and control word and this tracking regulation and control word; And
After determining a target frequency value, this logic control element preferentially determines the maximum possible value of this process voltage temperature adjusting word, determines the maximum possible value of this acquisition regulation and control word again, and final decision should be followed the trail of the value of regulation and control word with synthetic this target frequency value.
23. polar transmitter according to claim 22, it is characterized in that this vibration regulation and control word comprises 24, this process voltage temperature adjusting word is the first six most important significance position, this acquisition regulation and control word be next seven position, is next 11 position again and should follow the trail of the regulation and control word.
24. polar transmitter according to claim 13 is characterized in that, this first angle is negative 90 degree, and this second angle is positive 90 degree.
25. a phase modulation method is characterized in that, is used for a polar transmitter, produces according to a phase sample to have the radiofrequency signal that phase place changes, this phase modulation method comprises:
This radiofrequency signal and a reference frequency and this phase sample are compared to determine a target frequency value;
Produce a vibration regulation and control word according to this target frequency value;
Provide that to have a modulation limit of power be a digital oscillator between one first angle to the second angle, in order to produce surely radiofrequency signal according to this vibration regulation and control word, wherein this first angle and this second angle differ 180 degree;
When this target frequency value surpassed this modulation limit of power, the residual value of spending according to this target frequency value deduction 180 produced this vibration regulation and control word, and makes this accurate radiofrequency signal jump turnback with synthetic this radiofrequency signal with this target frequency value; And
When this target frequency value is no more than this modulation limit of power, directly produces this vibration regulation and control word according to this target frequency value, and make this accurate radiofrequency signal directly export this radiofrequency signal that has this target frequency value with synthetic.
26. phase modulation method according to claim 25 is characterized in that, determines that the step of this target frequency value further comprises, and regulates and control word to determine this target frequency value with reference to a channel frequency.
27. phase modulation method according to claim 25, it is characterized in that, this vibration regulation and control word comprises a process voltage temperature adjusting word, the regulation and control word followed the trail of in one acquisition regulation and control word and, this phase modulation method further comprises: the part position according to this process voltage temperature adjusting word produces one first thermometer-code, produce one second thermometer-code according to this acquisition regulation and control word, and produce one the 3rd thermometer-code according to the part position of this tracking regulation and control word; Wherein this digital oscillator comprises a plurality of electric capacity, and these a plurality of electric capacity are subject to the control of this first thermometer-code, this second thermometer-code and the 3rd thermometer-code accordingly to produce this accurate radiofrequency signal.
28. phase modulation method according to claim 27 is characterized in that, the step that produces this first thermometer-code comprises, and first three the most important significance position in this process voltage temperature adjusting word is converted to this first thermometer-code that comprises seven isobitses.
29. phase modulation method according to claim 28 is characterized in that, this radiofrequency signal is the global intercommunication microwave access signal, and each isobits of this first thermometer-code makes this radiofrequency signal transfer 32MHz.
30. phase modulation method according to claim 27 is characterized in that, the step that produces this first thermometer-code comprises, and front four the most important significance positions in this process voltage temperature adjusting word are converted to this first thermometer-code that comprises 15 isobitses.
31. phase modulation method according to claim 30 is characterized in that, this radiofrequency signal is the Wideband-CDMA signal, and each isobits of this first thermometer-code makes this radiofrequency signal transfer 16MHz.
32. phase modulation method according to claim 27, it is characterized in that, the step that produces this second thermometer-code comprises, and this acquisition regulation and control word is converted to this second thermometer-code that comprises 127 isobitses, and each isobits makes this radiofrequency signal transfer 1MHz.
33. phase modulation method according to claim 27 is characterized in that, the step that produces the 3rd thermometer-code comprises, and the first five the most important significance position in this tracking regulation and control word is converted to the 3rd thermometer-code that comprises 31 isobitses.
34. phase modulation method according to claim 27 is characterized in that, determines that the step of this target frequency value comprises:
This target frequency value is synthesized in linear combination with this process voltage temperature adjusting word, this acquisition regulation and control word and this tracking regulation and control word; And
Determine first the maximum possible value of this process voltage temperature adjusting word, determine the maximum possible value of this acquisition regulation and control word again, final decision should be followed the trail of the value of regulation and control word with synthetic this target frequency value.
35. phase modulation method according to claim 27, it is characterized in that this vibration regulation and control word comprises 24, this process voltage temperature adjusting word is the first six most important significance position, this acquisition regulation and control word be next seven position, is next 11 position again and should follow the trail of the regulation and control word.
36. phase modulation method according to claim 25 is characterized in that, this first angle is negative 90 degree, and this second angle is positive 90 degree.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4924232A (en) * | 1988-10-31 | 1990-05-08 | Hughes Aircraft Company | Method and system for reducing phase error in a phased array radar beam steering controller |
| CN1524336A (en) * | 2001-02-22 | 2004-08-25 | �����ɷ� | Trimming method and trimming device for a pll circuit for two-point modulation |
| CN1553592A (en) * | 2003-06-06 | 2004-12-08 | 华为技术有限公司 | Signal phase tracking network |
| CN101114832A (en) * | 2006-07-28 | 2008-01-30 | 晨星半导体股份有限公司 | Delta-sigma modulated fractional-n pll frequency synthesizer |
-
2008
- 2008-11-24 CN CN 200810177690 patent/CN101741451B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4924232A (en) * | 1988-10-31 | 1990-05-08 | Hughes Aircraft Company | Method and system for reducing phase error in a phased array radar beam steering controller |
| CN1524336A (en) * | 2001-02-22 | 2004-08-25 | �����ɷ� | Trimming method and trimming device for a pll circuit for two-point modulation |
| CN1553592A (en) * | 2003-06-06 | 2004-12-08 | 华为技术有限公司 | Signal phase tracking network |
| CN101114832A (en) * | 2006-07-28 | 2008-01-30 | 晨星半导体股份有限公司 | Delta-sigma modulated fractional-n pll frequency synthesizer |
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