CN102064846B - Frequency synthesizer and frequency synthesizing method - Google Patents
Frequency synthesizer and frequency synthesizing method Download PDFInfo
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Abstract
The invention provides a frequency synthesizer and a frequency synthesizing method for generating a plurality of carrier center frequencies of multiband orthogonal frequency division multiplexing ultra wideband. The carrier center frequency comprises first to fourteenth frequency from the lower to the higher, and two adjacent carrier center frequencies are alternated in a basic spacing frequency. The method comprises the following steps: generating an eighth frequency; generating first and second spacing frequencies of the frequency, and selecting one of the first and second spacing frequencies as a spacing output frequency, wherein the first and second spacing frequencies is the integral multiple of the basic spacing frequency; generating the basic spacing frequency; selectively mixing the eighth frequency and the spacing output frequency to generate a first output frequency, wherein the first output frequency is one of the eighth frequency, a second frequency, the fourteenth frequency, a fifth frequency and an eleventh frequency; and selectively mixing the first output frequency and the basic spacing frequency to generate a second output frequency, wherein the second output frequency is one of the first to the fourteenth frequency.
Description
The application is that denomination of invention is " frequency synthesizer and a frequency combining method ", the dividing an application of the patent application that application number is 200610168691.1, the applying date is on December 22nd, 2006.
Technical field
The present invention relates to a kind of frequency synthesizer (Frequency Synthesizer), and be particularly related to a kind of Mb-ofdm (Multi-Band Orthogonal Frequency Division Multiplexing; MB-OFDM) ultra wideband (Ultra Wideband; UWB) frequency synthesizer of system.
Background technology
The applied frequency band range of the ultra broadband system of Mb-ofdm (being designated hereinafter simply as MB-OFDM UWB system) is contained about 3.9G to 10.1G hertz, and this frequency band range frequency band that to be distinguished into 14 frequency ranges be the 528M hertz.Fig. 1 shows the operational frequency bands figure of MB-OFDM UWB system.As shown in the figure; Operational frequency bands 100 is to be distinguished into the first to the 14 frequency band b1 to b14 from left to right; The carrier frequency centre frequency of each frequency band (being called the first to the 14 frequency f 1 to f14) is respectively 3432M hertz, 3960M hertz, 4488M hertz, 5016M hertz, 5544M hertz, 6072M hertz, 6600M hertz, 7128M hertz, 7656M hertz, 8184M hertz, 8712M hertz, 9240M hertz, 9768M hertz, and the 10296M hertz.In addition, this first to the 14 frequency band b1 to b14 is by low paramount, and per three frequency bands are classified into one group, are classified into first to the 5th frequency band group BG1 to BG5 (the 5th frequency band group BG5 only comprises two frequency band b13 and b14) altogether.
According to the standard of MB-OFDM UWB system, the frequency synthesizer of a MB-OFDM UWB system must provide three frequency bands (scope that contains 3.9G to 5.1G approximately) of first frequency band group BG1 at least, and this names the operation into pattern one.And if more multidata transmission quantity will be provided, it is the above frequency band of 5G that frequency then must be provided, and this names the operation into pattern two.Because these frequency bands are handover operation apace, so utilize conventional phase locked loops (PLL) technology can't satisfy the system applies demand merely.Utilizing frequency mixing technique is the solution of present full blast to produce required frequency and multiplexer to select required frequency.Yet, only supply a pattern one frequency band range of prior art [1] to [7], and prior art [8] all can't produce 14 whole in MB-OFDM UWB system frequency bands though two the operation of supplying a pattern only produces seven frequency bands.And prior art [9] provides 14 complete frequency bands, and its main framework is a phase-locked loop and five frequency mixers.Yet frequency mixer is a nonlinear large-signal function circuit, on whole radio circuit, can produce strong noise, thereby reduces the quality of transmission signals.
The high-rate wireless transmission certainly will be the target of future communications development, and ultra wideband device has more the function beyond the communication.Therefore, a kind ofly can contain the first to the 14 frequency in the MB-OFDM UWB system, the monolateral frequency mixer with low number is necessary to some extent with the frequency synthesizer that reduces noise.
[1]：IEEE?802.15.3a，Updated?MB-OFDM?Proposal?Specification(03/268r3)，Mar.2004，by?MBOA
[2]：C.F.Liang?and?S.I.Liu，“A?Fast-Switching?Frequency?Synthesizer?for?UWB?applications，”IEEE?2005?Asia?Solid-State?Circuit?Conference，8-2，pp.197-200
[3]：C.C.Lin?and?C.K.Wang，“Subharmonic?Direct?Frequency?for?Mode-1MB-OFDM?UWB?System”，IEEE?2005.On?VLSI?Circuit，3-3，pp?38-41.
[4]：C.Sandner，et.Al.，“A?3GHz?to?7GHz?Fast-Hopping?Frequency?Synthesizer?for?UWB，”International?Workshop?on?Ultra?Wildband?System，2004，18-21?May?2004，pp?405-409.
[5]：D.Leenaerts，et.Al.，A?SiGe?BiCMOS?1ns?Fast?Hopping?Frequency?Synthesizer?for?UWB?Radio，”2005?IEEE?1nt.Solid-State?Circuit?Conference?11.2，pp.202-203.
[6]：Hyun-Su?Chae，et.Al.，“A?Fast?Hopping?Frequency?Synthesizer?for?UWB?Systems?in?a?CMOS?Technology，”Int.Symp.On?Wireless?Communiacation?Systmes?2005，05-09?Sept.2005，pp370-374.
[7]：Remco?van?de?Beek，et.Al.“A?fast-hopping?single-PLL?3-band?UWB?synthesizer?in?0.25um?SiGe?BiCMOS，”Proceedings?of?ESSCIRC?2005，12-16Sept.2005，pp.173-176.
[8]：Jri?Lee?and?Da-Wei?Chiu，“A?7-band?3-8GHz?Frequency?Synthesizer?With?1ns?Band-Switching?Time?in?0.18um?CMOS?Technology”，IEEE?2005ISSCC，11-3，pp.204-205，2005.
[9]：C.Mishra，et.Al.，“Frequency?Planning?and?Synthesizer?Architectures?for?Multiband?OFEM?UWB?radios，”IEEE?Trans.On?Microwave?Theory?and?Techniques，2005.
Summary of the invention
The present invention provides a kind of frequency combining method, is used to produce 14 frequencies of MB-OFDM UWB system, and a kind of frequency synthesizer of using this frequency combining method.Frequency synthesizer of the present invention only comprises two each and every one frequency mixers, can reduce generating noise, thereby improves the quality of transmission signals.
The present invention provides a kind of frequency combining method, is used to produce the carrier frequency centre frequency of MB-OFDM UWB system, and said centre frequency comprises the first to the 14 frequency by being low to moderate height, and wantonly two these adjacent carrier frequency centre frequencies are separated with a basic interval frequency mutually.
According to an aspect of the present invention; A kind of frequency combining method is provided; Be used to produce a plurality of carrier frequency centre frequencies of the ultra wideband of Mb-ofdm; Said carrier frequency centre frequency comprises the first to the 14 frequency by being low to moderate height, and wantonly two these adjacent carrier frequency centre frequencies are separated with a basic interval frequency mutually, and this method comprises: produce the 8th frequency; Produce first and second spacing frequency of frequency, and one of them is an interval output frequency to select this first and second spacing frequency, wherein, this first and second spacing frequency equals six times and three times of this basic interval frequency respectively; Produce this basic interval frequency; From the 8th frequency; Or the 8th frequency deduct respectively this first or second at interval output frequency or the 8th frequency add respectively this first or second at interval output frequency select one of them; And produce first output frequency; Wherein, first output frequency be the 8th, second, the 5th, the 14 and the 11 frequency one of them; And from this first output frequency; Or this first output frequency deducts this basic interval frequency, or this first output frequency adds that this basic interval frequency selects one of them, and produces second output frequency; Wherein, this second output frequency be the first to the 14 frequency one of them.
According to a further aspect in the invention, a kind of frequency synthesizer is provided, is used to produce a plurality of carrier frequency centre frequencies of the ultra wideband of Mb-ofdm; Said carrier frequency centre frequency comprises the first to the 14 frequency by being low to moderate height; Wantonly two these adjacent carrier frequency centre frequencies are separated with a basic interval frequency mutually, and this frequency synthesizer comprises: a phase-locked loop is used to produce an initialize signal; Wherein, the frequency of this initialize signal equals the 8th frequency; One spacing frequency generator; Be used to export first and second and export signal at interval; Wherein, this first at interval output signal frequency be to be chosen as first or second spacing frequency and wherein; This first and second spacing frequency equals six times and three times of this basic interval frequency respectively, and this second interval output signal frequency equals this basic interval frequency; First frequency mixer; Frequency from this initialize signal; Or the frequency of this initialize signal deducts this first or second output signal frequency at interval, or the frequency of this initialize signal add this first or second at interval output signal frequency select one of them, and produce the first output signal; Wherein, first output signal frequency be the 8th, second, the 5th, the 14 and the 11 frequency one of them; And second frequency mixer; From this first output signal frequency; Or this first output signal frequency deducts the second interval output signal frequency; Or this first output signal frequency add second at interval output signal frequency select one of them, and produce the second output signal, wherein this second output signal frequency be the first to the 14 frequency one of them.
Description of drawings
Fig. 1 shows the band diagram of MB-OFDM UWB system.
Fig. 2 A and Fig. 2 B show frequency of the present invention respectively and produce the embodiment of flow chart of method that planning sketch map and provided by the present invention produces the first to the 14 frequency of the ultra wideband of Mb-ofdm;
Fig. 2 C shows a preferred embodiment of flow chart shown in Fig. 2 B;
Fig. 3 shows an embodiment of the structure calcspar of the frequency synthesizer of method shown in the application drawing 2C proposed by the invention;
Fig. 4 shows the embodiment of structure calcspar of the spacing frequency generator of Fig. 3 provided by the present invention;
Fig. 5 A and Fig. 5 B show the embodiment of structure calcspar of first frequency mixer of Fig. 3 provided by the present invention respectively, and an embodiment of the circuit diagram of the thin portion circuit structure of first or second mixting circuit of Fig. 5 A; And
Fig. 6 shows in this preferred embodiment, an embodiment of the structure calcspar of first frequency mixer of Fig. 3 provided by the present invention.
The reference numeral explanation
The 100-operational frequency bands
The 300-frequency synthesizer
The 302-phase-locked loop
304-spacing frequency generator
306-first frequency mixer
308-second frequency mixer
410-first divider
402-second divider
422-removes three-circuit
The 424-polyphase filters
The 430-multiplexer
The 510-path selector
The monolateral frequency mixer of 520-
521, first and second block of 522-
523-first mixting circuit
524-second mixting circuit
The 530-multiplexer
The 610-path selector
The monolateral frequency mixer of 620-
621, first and second block of 622-
The 630-multiplexer
B1-b14-the first to the 14 frequency band
BG1-BG5-first to the 5th group of frequencies
F1-f14-the first to the 14 frequency
Fd1, first and second spacing frequency of fd2-
Fd1-I, Q, fd2-I, first and second blank signal of Q-
The minimum spacing frequency of fdm-
Fdo1-I, Q, fdo2-I, first and second exports signal at interval Q-
Fi-I, the Q-initialize signal
Fmo-I, the Q-mixer output signal
The positive and the inversion signal of fdo1-I (+), fdo1-I (-)-first output in-phase signal
The positive and the inversion signal of fdo1 '-I (+), fdo1 '-I (-)-covert in-phase signal
The positive and the inversion signal of fdo1-Q (+), fdo1-Q (-)-first output orthogonal signal
The positive and the inversion signal of fdo1 '-Q (+), fdo1 '-Q (-)-covert orthogonal signalling
Fo-exports signal
The positive and the inversion signal of fo1-I (+), fo1-I (-)-first output in-phase signal
The positive and the inversion signal of fo1-Q (+), fo1-Q (-)-first output orthogonal signal
Group1-Group5-first to the 5th group of frequencies
I1-I4-path selector input
Imix11, Imix12, Imix21, Imix22-frequency mixer input
O1-O4-path selector output
Omix11, Omix12, Omix21, Omix22-mixer output
Z1, first and second load impedance of Z2-
Embodiment
Fig. 2 A shows a frequency provided by the present invention and produces the planning sketch map, and Fig. 2 B show provided by the present invention one produce the first to the 14 frequency of MB-OFDM UWB system the flow chart of method.At first referring to Fig. 2 A; Do not show the first to the 14 frequency f 1 to f14 by a left side from parting on the right side among the figure; Represent respectively the required generation of the ultra wideband of Mb-ofdm 3432M, 3960M, 4488M ... 9768M, 10296M hertz, and wantonly two adjacent said frequencies are separated with a basic interval frequency f dm (528M hertz) mutually.
Existing simultaneously with reference to figure 2A and Fig. 2 B.At first carry out step 200.In step 200, this first to the 14 frequency f 1 to f14 is by low paramount, and per three frequencies are classified into one group, are classified into first to the 5th group of frequencies Group1 to Group5 altogether.Notice that the 5th group of frequencies only contains the 13 frequency f 13 and the 14 frequency f 14.
Next carry out step 202.In step 202, produce the centre frequency (i.e. the 8th frequency f 8) of the 3rd group of frequencies Group3.
Next carry out step 204.Step 204 is that the 8th frequency f 8 rates that step 202 is produced are carried out the mixing program; With centre frequency (being second frequency f2), the centre frequency (i.e. the 5th frequency f 5) of second frequency group Group2, the i.e. centre frequency of the 4th group of frequencies Group4 (i.e. the 11 frequency f 11), and the centre frequency of the 5th group of frequencies Group5 (i.e. the 14 frequency f 14) that produces this first frequency group Group1.
Next; In step 206; The centre frequency (f2, f5, f8, f11 and f14) that is first to the 5th group of frequencies Group1 to Group5 that step 202 and 204 is produced is carried out the mixing program, is used for producing respectively two side frequencies of this centre frequency of this first to the 5th group of frequencies.Clearer and more definite; This step is that second frequency f2 is carried out the mixing program and produces the first and the 3rd frequency f 1 and f3; The 5th frequency f 5 is carried out the mixing program and produced the 4th and the 6th frequency f 4 and f6; The 8th frequency f 8 is carried out the mixing program and produced the 7th and the 9th frequency f 7 and f9, the 11 frequency f 11 is carried out the mixing program and produced the tenth and the 12 frequency f 10 and f12, and the 14 frequency f 14 is carried out the mixing program and produced the 13 frequency f 13.
Whole frequencies that step 202,204 and 206 is produced i.e. 14 frequencies (first frequency f1 to the 14 frequency f 14).
Fig. 2 C shows an embodiment of flow chart shown in Fig. 2 B.Existing referring to Fig. 2 C, and still simultaneously with reference to figure 2A and Fig. 2 B to promote understanding.At first carry out step 212.In this step; The 8th frequency f 8 (7128M hertz), first and second spacing frequency fd1 and fd2; And basic interval frequency f dm (528M hertz) is by being generated, and this first and second spacing frequency fd1 and fd2 one of them be an output frequency fdo at interval.First and second spacing frequency fd1 and fd2 equal the integral multiple of this basic interval frequency f dm.In one embodiment, first and second spacing frequency fd1 and fd2 are respectively six times and three times of basic interval frequency f dm, promptly are respectively 3168 hertz shown in Fig. 2 A and 1584M hertz.
In an embodiment of step 212, the 8th frequency f 8 and the first spacing frequency fd1 are at first generated.For example be to use one comprise two voltage controlled oscillators phase-locked loop, wherein this two voltage controlled oscillator produces the 8th frequency f 8 and the first spacing frequency fd1 respectively.Next; Use one first divider with this first spacing frequency fd1 divided by first integer (for example be 2) to produce this second spacing frequency fd2; Then use second divider with this second spacing frequency fd2 divided by second integer (for example be 3) producing this basic interval frequency f dm, and one of them is output frequency fdo at interval to use a multiplexer to select first and second spacing frequency fd1 and fd2.
Next carry out step 214.In step 214, be the 8th frequency f 8 that step 212 is produced and output frequency fdo at interval carries out an optionally mixing program, be used to produce the first output frequency fo1, wherein, fo1=f8 or (f8-fdo) or (f8+fdo).Therefore; When interval output frequency fdo is chosen as the first spacing frequency fd1 (promptly 3168 hertz) in step 212; Then the first output frequency fo1 is the 8th frequency f 8; Or the centre frequency of first frequency group Group1 (being second frequency f2), or the centre frequency of the 5th group of frequencies Group5 (i.e. the 14 frequency f 14); When interval output frequency fdo is chosen as the second spacing frequency fd2 (promptly 1584 hertz) in step 212; The first output frequency fo1=the 8th frequency f 8 then; Or the centre frequency of second frequency group Group2 (i.e. the 5th frequency f 5), or the centre frequency of the 4th group of frequencies Group4 (i.e. the 11 frequency f 11).
Next, carry out step 216.In this step; First output frequency fo1 that step 214 produced and basic interval frequency f dm (being the 528M hertz) that step 212 produced are implemented a Frequency mixing processing optionally; Be used to produce the second output frequency fo2, wherein, fo2=fo1 or (fo1-fdm) or (fo1+fdm).Therefore, when the centre frequency (being second frequency f2) of the first output frequency fo1=first frequency group Group1, the frequency (f1, f2 or f3) in the middle of the second output frequency fo2=first frequency group Group1 then; When the centre frequency (i.e. the 5th frequency f 5) of the first output frequency fo1=second frequency group Group2, the frequency (f4, f5 or f6) in the middle of the second output frequency fo2=second frequency group Group2 then; When the centre frequency (i.e. the 8th frequency f 8) of the first output frequency fo1=the 3rd group of frequencies Group3, the frequency (f7, f8 or f9) in the middle of the second output frequency fo2=the 3rd group of frequencies Group3 then; When the centre frequency (i.e. the 11 frequency f 11) of the first output frequency fo1=the 4th group of frequencies Group4, the frequency (f10, f11 or f12) in the middle of the second output frequency fo2=the 4th group of frequencies Group4 then; When the centre frequency (i.e. the 14 frequency f f14) of the first output frequency fo1=the 5th group of frequencies Group5, the frequency (f13 or f14) in the middle of the second output frequency fo2=the 5th group of frequencies Group5 then.The frequency that this step produced promptly may be selected to be one in the middle of 14 frequencies (first frequency f1 to the 14 frequency f 14).Must note; Owing to be not to drop in the frequency band range of the ultra wideband of Mb-ofdm (f14+fd3); Therefore the fo2 situation that is chosen as (f14+fd3) can be designed to not take place, or the second output frequency fo2 still may be selected to be (f14+fd3) but is not the late-class circuit utilization of frequency synthesizer.
Fig. 3 shows an embodiment of the structure calcspar of the frequency synthesizer 300 of method shown in the application drawing 2C proposed by the invention.As shown in the figure, frequency synthesizer 300 comprises a phase-locked loop 302, a spacing frequency generator 304, one first frequency mixer 306 and one second frequency mixer 308.
Phase-locked loop 302; Produce an initial in-phase signal fi-I and an initial orthogonal signalling fi-Q (below be referred to as initialize signal f0-I; Q); Both frequencies all equal the 8th frequency f 8 (7128M hertz) shown in Fig. 2 A and phase place differs 90 each other, and with this initialize signal f0-I, Q provides to first frequency mixer 306.
Spacing frequency generator 304; Be used to provide first to export signal fdo1-I at interval; Q (comprising its in-phase signal fdo1-I and orthogonal signalling fdo1-Q) and second exports signal fdo2-I at interval, Q (comprising its in-phase signal fdo2-I and orthogonal signalling fdo2-Q), wherein; Signal fdo1-I is exported at this first interval, and the frequency of Q (being called the first interval output frequency fdo1) is to be chosen as the first spacing frequency fd1 or the second spacing frequency fd2.This first and second spacing frequency fd1 and fd2 equal the integral multiple of the basic interval frequency f dm of Fig. 2 A, and this second exports at interval signal fdo2-I, and the frequency of Q (be called second output frequency fdo2) at interval equals this basic interval frequency f dm.In one embodiment, first and second spacing frequency fd1 and fd2 are respectively six times and three times of basic interval frequency f dm (528M hertz), promptly are respectively 3168M hertz shown in Fig. 2 A and 1584M hertz.Spacing frequency generator 302 is also at interval exported signal fdo1-I with first, and Q provides to first frequency mixer 306, and exports signal fdo2-I at interval with second, and Q provides to second frequency mixer 308.Correspond to Fig. 2 C, phase-locked loop 302 and spacing frequency generator 304 execution in step 212.
First frequency mixer 306; Be the initialize signal fi-I that phase-locked loop 302 is produced; Q (frequency is the 8th frequency f 8=7128M hertz) exports signal fd-I with first interval that spacing frequency generator 304 is produced; Q carries out a Frequency mixing processing optionally, be used to produce frequency equates and the first output in-phase signal fo1-I of phase phasic difference 90 degree and the first output orthogonal signal fo1-Q (below be referred to as the first output signal fo1-I, Q).Then with the first output signal fo1-I, Q provides to second frequency mixer 308 first frequency mixer 306.The first output signal fo1-I, the frequency of Q (below be called the first output frequency fo1) can be the 8th frequency f 8 itself according to selected different Frequency mixing processing, or is (f8-fd1), or is (f8 ten fd1).Therefore; When the first interval output frequency fdo1=first spacing frequency fd1 (promptly 3168 hertz); The then centre frequency (being second frequency f2) of the first output frequency fo1=first frequency group Group1, or the centre frequency of the 5th group of frequencies Group5 (i.e. the 14 frequency f 14); When the first interval output frequency fdo1=second spacing frequency fd2 (promptly 1584 hertz); The then centre frequency of the first output frequency fo1=second frequency group Group2 (i.e. the 5th frequency f 5), or the centre frequency of the 4th group of frequencies Group4 (i.e. the 11 frequency f 11); When skipping over initialize signal (i.e. the 8th frequency f 8) with first at interval during the mixing action of output frequency fdo1, the first output frequency fo1=the 8th frequency f 8 then.Correspond to Fig. 2 C, first frequency mixer, 306 execution in step 214.
Second frequency mixer 308; Be this first output signal fo1-I that this first frequency mixer 306 is produced; Signal fdo2-I is exported at second interval that Q and this spacing frequency generator 302 are produced; Q carries out a Frequency mixing processing optionally, produce then that frequency equates and the second output in-phase signal fo2-I of phase phasic difference 90 degree and the second output orthogonal signal fo2-Q (below be referred to as the second output signal fo2-I, Q).The second output signal fo2-I, the frequency of Q (below be called the second output frequency fo2) can be the first output frequency fo1 itself according to selected different Frequency mixing processing, or (fo1-fdo2), or (fo1+fdo2).Therefore, when the centre frequency (being second frequency f2) of the first output frequency fo1=first frequency group Group1, the frequency (f1, f2 or f3) in the middle of the second output frequency fo2=first frequency group Group1 then; When the centre frequency (i.e. the 5th frequency f 5) of the first output frequency fo1=second frequency group Group2, the frequency (f4, f5 or f6) in the middle of the second output frequency fo2=second frequency group Group2 then; When the centre frequency (i.e. the 8th frequency f 8) of the first output frequency fo1=the 3rd group of frequencies Group3, the frequency (f7, f8 or f9) in the middle of the second output frequency fo2=the 3rd group of frequencies Group3 then; When the centre frequency (i.e. the 11 frequency f 11) of the first output frequency fo1=the 4th group of frequencies Group4, the frequency (f10, f11 or f12) in the middle of the second output frequency fo2=the 4th group of frequencies Group4 then; When the centre frequency (i.e. the 14 frequency f f14) of the first output frequency fo1=the 5th group of frequencies Group5, the frequency (f13 or f14) in the middle of the second output frequency fo2=the 5th group of frequencies Group5 then.Must note; Owing to be not to fall within the frequency band range of the ultra wideband of Mb-ofdm (f14+fd3); Therefore the fo2 situation that is chosen as (f14+fd3) can be designed to not take place, or the second output frequency fo2 still may be selected to be (f14+fd3) but is not the late-class circuit utilization of frequency synthesizer.Correspond to Fig. 2 C, second frequency mixer, 308 execution in step 216.
Must notice that first and second frequency mixer 306 and 308 is four phase mixer.Therefore, the initialize signal fi-I shown in the figure, Q, first and second exports signal fdo1-I at interval, Q and fdo2-I, Q, and first and second output signal fo1-I, Q and fo2-I, in fact Q is all four phase signals.This means, the in-phase signal of above-mentioned arbitrary signal comprises positive and inversion signal and orthogonal signalling also comprise positive and inversion signal.With initialize signal fi-I, Q is an example, and initial in-phase signal fi-I comprises positive phase signals fi-I (+) and inversion signal fi-I (-), and initial orthogonal signalling fi-Q also comprises in-phase signal fi-Q (+) and inversion signal fi-Q (-).
Fig. 4 shows the embodiment of structure calcspar of the spacing frequency generator 304 of Fig. 3 provided by the present invention.As shown in the figure, spacing frequency generator 302 comprises one first divider 410, one second divider 420, and a multiplexer 430.
Notice, the first blank signal fd1-I, Q generation initialize signal capable of using fi-I, the phase-locked loop 302 of Q together produces.In a preferred embodiment, phase-locked loop 302 can comprise first and second voltage controlled oscillator (not to illustrate), exports this initialize signal fi-I respectively, Q and this first blank signal fd1-I, Q.Or in another embodiment, be to utilize phase-locked loop 302 to produce initialize signal fi-I, Q, and utilize another phase-locked loop to produce the first blank signal fd1-I, Q also provides to first divider 410 (not to illustrate).
Fig. 4 also shows when this N2=3, an embodiment of a thin portion square construction drawing of second divider 420.As shown in the figure, this second divider 420 comprises that one removes a three-circuit 422 and a polyphase filters 424.Remove three-circuit 422 and be used to receive this second blank signal fd2-I, Q, and this second spacing frequency fd2 (comprised positive phase signals fo (+) and inversion signal fo (-) divided by three with the output signal fo that produces a two phase.Polyphase filters 424 receives should output signal fo, and produce four phase places according to the output signal fo of this two phase this second export signal fd2-I, Q at interval.
Fig. 5 A shows the embodiment of a square Organization Chart of first frequency mixer 306 of Fig. 3.As shown in the figure, first frequency mixer 306 comprises a path selector 510, one monolateral frequency mixers 520, and a multiplexer 530.
Path selector 510 is used to change this and first exports at interval signal fdo1-I, the phase sequence of Q and produce a covert signal fdo '-I, and Q (comprises covert in-phase signal fdo '-I and covert orthogonal signalling fdo '-Q).As shown in the figure, path selector 510 has four input I1 to I4, and four output O1 to O4.Input I1 and I2 are coupled to positive phase signals fdo1-I (+) and the inversion signal fdo1-I (-) that in-phase signal fdo1-I is exported at first interval respectively, and input I3 and I4 are coupled to positive phase signals fdo1-Q (+) and the inversion signal fdo1-Q (-) of the first interval output orthogonal signal fdo1-Q respectively.Similarly; Output O1 and O2 export positive phase signals fdo '-I (+) and inversion signal the fdo '-I (-) of this covert in-phase signal fdo '-I respectively, and output O3 and O4 export positive phase signals fdo '-Q (+) and inversion signal the fdo '-Q (-) of covert orthogonal signalling fdo '-Q respectively.First exports signal fdo1-I at interval, and the phase sequence of Q is I (+), I (-), Q (+) and Q (-) originally.Path selector 510 changes this phase sequence; Be to change Q (+), Q (-), I (+) and I (-) into for example, and export output O1 to O4 respectively to export monolateral frequency mixer 520 to as fdo '-I (+), fdo1-I (-), fdo '-Q (+), fdo1-Q (-).
As shown in the figure, block 521 comprises first and second mixting circuit 523 and 524, and first and second load impedance (like resistance) Z1 and Z2.First mixting circuit 523 comprises input Imix11, Imix21, Imix31, and Imix41, and output Omix11 and Omix21.Similarly, second mixting circuit 522 comprises input Imix12, Imix22, Imix32, and Imix42, and output Omix21 and Omix22.Input Imix11, Imix21, Imix12 and Imix22 are coupled to four phase signal fi-I (+), fi-I (-), fi-Q and the fi-Q (-) of initial in-phase signal respectively.And input Imix31, Imix41, Imix32 and Imix42 are coupled to output O1, O2, O3 and the O4 of path selector.Output Omix11 and Omix22 are connected to each other; And export the positive phase signals fmo-I (+) of mixing output in-phase signal fmo-I; Similarly, output Omix21 and Omix12 are connected to each other, and export the inversion signal fmo-I (-) of this mixing output in-phase signal fmo-I.
When path selector 510 is chosen as different covert signal the fdo '-I of output, during Q, mixer output signal fmo-I, the frequency of Q can be inconjunction with and be chosen as (f8-fdo1) or (f8+fdo1).Table 1 is listed different covert signal fdo '-I, Q and mixer output signal fmo-I, both relations of the frequency of Q (representing with fmo).Table can be known thus, and as mixer output signal fmo-I, when the frequency of Q desired to be chosen as (f8-fdo1), path selector 510 need not change first and export signal fdo1-I at interval, and the phase sequence of Q can be directly as covert signal fdo '-I, Q; As mixer output signal fmo-I; When the frequency of Q desires to be chosen as (f8+fdo1); Path selector 510 is only exported signal fdo1-I with first at interval; The phase sequence of Q changes I (+), I (-), Q (-) and Q (+) into can be respectively as covert signal fdo '-I, four phase place I (+) of Q, I (-), Q (+) and Q (-).
Table 1
Fig. 5 B shows the thin portion circuit structure of first or second mixting circuit 523 and 524, and it is a typical construction, and its operation principles belongs to known techniques, and the operator of tool this area is when being familiar with it.Therefore at this for for simplicity, seldom do explanation.In addition, this circuit structure only is used as an example to do illustrative purposes, and the present invention is when being not restricted to this.
Fig. 6 shows the embodiment of a circuit structure diagram of second frequency mixer 308 of Fig. 3.As shown in the figure, second frequency mixer 308 comprises a path selector 610, one monolateral frequency mixers 620, and a multiplexer 630.Path selector 510 and 610 structures are identical; Difference only be input I1 and the I2 of path selector 610 change into be coupled to respectively second export in-phase signal fdo2-I at interval positive phase signals fdo2-I (+) and inversion signal fdo2-I (-), input I3 and I4 are coupled to second positive phase signals fdo2-Q (+) and the inversion signal fdo2-Q (-) of output orthogonal signal fdo2-Q at interval respectively.Monolateral frequency mixer 520 (first and second block 521 and 522) is identical with the structure of monolateral frequency mixer 620 (first and second block 621 and 622); Difference only is that input Imix1 and Imix2 change positive phase signals fo1-I (+) and the inversion signal fo1-I (-) that is coupled to the first output in-phase signal fo1-I into, and input Imix5 and Imix6 are positive phase signals fo1-Q (+) and the inversion signal fo1-Q (-) that is coupled to the first output orthogonal signal fo1-Q.Multiplexer 530 is identical with 630 structure; Difference only is that multiplexer 630 changes the mixer output signal fmo-I that the monolateral frequency mixer 620 of reception is produced into; The first output signal fo1-I that the Q and first frequency mixer 308 are exported; Q, and optionally export one of them and be this second output signal fo2-I, Q.
Though the present invention discloses as above with preferred embodiment; So it is not to be used to limit the present invention; Anyly have the knack of this art; Do not breaking away from the spirit and scope of the present invention, when can doing a little change and retouching, so protection scope of the present invention is as the criterion when looking appended the claim person of defining.
Claims (15)
1. frequency combining method; Be used to produce a plurality of carrier frequency centre frequencies of the ultra wideband of Mb-ofdm; Said carrier frequency centre frequency comprises the first to the 14 frequency by being low to moderate height, and wantonly two these adjacent carrier frequency centre frequencies are separated with a basic interval frequency mutually, and this method comprises:
Produce the 8th frequency;
Produce first and second spacing frequency of frequency, and one of them is an interval output frequency to select this first and second spacing frequency, wherein, this first and second spacing frequency equals six times and three times of this basic interval frequency respectively;
Produce this basic interval frequency;
From the 8th frequency; Or the 8th frequency deduct respectively this first or second at interval output frequency or the 8th frequency add respectively this first or second at interval output frequency select one of them; And produce first output frequency; Wherein, first output frequency be the 8th, second, the 5th, the 14 and the 11 frequency one of them; And
From this first output frequency; Or this first output frequency deducts this basic interval frequency, or this first output frequency adds that this basic interval frequency selects one of them, and produces second output frequency; Wherein, this second output frequency be the first to the 14 frequency one of them.
2. frequency combining method as claimed in claim 1, wherein, the step that produces this first and second spacing frequency comprises:
Produce this first spacing frequency; And
With this first spacing frequency divided by two to produce this second spacing frequency.
3. frequency combining method as claimed in claim 1, wherein, the step that produces this basic interval frequency comprises:
With this second spacing frequency divided by three to produce this basic interval frequency.
4. frequency combining method as claimed in claim 1, wherein, the step that produces this first and second spacing frequency comprises:
Produce this first spacing frequency;
With this first spacing frequency divided by two to produce this second spacing frequency; And
Wherein, the step that produces this basic interval frequency comprises: with this second spacing frequency divided by three to produce this basic interval frequency.
5. frequency combining method as claimed in claim 1, wherein, the generation of the 8th frequency is to utilize a phase-locked loop.
6. frequency combining method as claimed in claim 5, wherein, the generation of this first spacing frequency is to utilize this phase-locked loop.
7. frequency combining method as claimed in claim 4, wherein, the generation of the 8th frequency is to utilize a phase-locked loop.
8. frequency combining method as claimed in claim 7, wherein, the generation of this first spacing frequency is to utilize this phase-locked loop.
9. frequency synthesizer; Be used to produce a plurality of carrier frequency centre frequencies of the ultra wideband of Mb-ofdm; Said carrier frequency centre frequency comprises the first to the 14 frequency by being low to moderate height, and wantonly two these adjacent carrier frequency centre frequencies are separated with a basic interval frequency mutually, and this frequency synthesizer comprises:
One phase-locked loop is used to produce an initialize signal, and wherein, the frequency of this initialize signal equals the 8th frequency;
One spacing frequency generator is used to export first and second and exports signal at interval, wherein, this first at interval output signal frequency be chosen as first or second spacing frequency and
Wherein, this first and second spacing frequency equals six times and three times of this basic interval frequency respectively, and this second interval output signal frequency equals this basic interval frequency;
First frequency mixer; Frequency from this initialize signal; Or the frequency of this initialize signal deducts this first or second output signal frequency at interval, or the frequency of this initialize signal add this first or second at interval output signal frequency select one of them, and produce the first output signal; Wherein, first output signal frequency be the 8th, second, the 5th, the 14 and the 11 frequency one of them; And
Second frequency mixer; From this first output signal frequency; Or this first output signal frequency deducts the second interval output signal frequency; Or this first output signal frequency add second at interval output signal frequency select one of them, and produce the second output signal, wherein this second output signal frequency be the first to the 14 frequency one of them.
10. frequency synthesizer as claimed in claim 9,
Wherein, this spacing frequency generator comprises:
First divider is coupled to a frequency and is first blank signal of this first spacing frequency, with this first spacing frequency divided by two to produce second blank signal of a frequency for this second spacing frequency;
Second divider is coupled to this second blank signal, is used for this second spacing frequency is exported signal divided by three to produce this second interval; And
One multiplexer is used to receive this first and second blank signal, and optionally exports one of them and export signal for this first interval.
11. frequency synthesizer as claimed in claim 10, wherein, this phase-locked loop is more exported this first blank signal.
12. frequency synthesizer as claimed in claim 11, wherein, this phase-locked loop comprises first and second voltage controlled oscillator, exports this initialize signal and this first blank signal respectively.
13. frequency synthesizer as claimed in claim 10, wherein, this second divider comprises:
One removes three-circuit, is used to receive this second blank signal, three is the output signal of two phase to produce one with the frequency of this second blank signal divided by this; And
One polyphase filters is used for receiving this output signal, and to produce this be that signal is exported at second interval of four phase places.
14. frequency synthesizer as claimed in claim 9, wherein, this first frequency mixer comprises:
One path selector is used to change this first interval and exports the phase sequence of signal and produce a covert signal;
One monolateral frequency mixer is used for this initialize signal and this covert signal are carried out a Frequency mixing processing, and produces a mixer output signal, wherein, the frequency of this mixer output signal be the second, the 14, the 5th and the 11 frequency one of them; And
One multiplexer is used to receive this mixer output signal and this initialize signal, and export one of them for this first output signal.
15. frequency synthesizer as claimed in claim 9, wherein, this second frequency mixer comprises:
One path selector is used to change this second interval and exports the phase sequence of signal and produce a covert signal; And
One monolateral frequency mixer; Be used for this first output signal is carried out a Frequency mixing processing with this covert signal; And produce a mixer output signal, wherein the frequency of mixer output signal be this first, the 3rd, the 4th, the 6th, the 7th, the 9th, the tenth, the 12 and the 13 frequency one of them; And
One multiplexer is used to receive this mixer output signal and this first output signal, and optionally exports one of them and be this second output signal.
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| US6243567B1 (en) * | 1997-09-30 | 2001-06-05 | Nec Corporation | Television tuner, tuner integrated circuit and method of controlling television tuner |
| CN1860708A (en) * | 2003-10-21 | 2006-11-08 | 索尼株式会社 | Frequency combining apparatus and frequency combining method |
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