CN102790616A - Low-stray rapid-frequency-hopping frequency synthesizer and fast frequency hopping method applying same - Google Patents
Low-stray rapid-frequency-hopping frequency synthesizer and fast frequency hopping method applying same Download PDFInfo
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- CN102790616A CN102790616A CN2011101309235A CN201110130923A CN102790616A CN 102790616 A CN102790616 A CN 102790616A CN 2011101309235 A CN2011101309235 A CN 2011101309235A CN 201110130923 A CN201110130923 A CN 201110130923A CN 102790616 A CN102790616 A CN 102790616A
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Abstract
The invention provides a low-stray rapid-frequency-hopping frequency synthesizer, comprising a single phase-locked ring, a frequency mixer and a gating device, wherein the single phase-locked ring is used for generating a signal with a fixed frequency; multiple frequency dividers for generating signals with different frequencies after being cascade connected to the phase-locked ring, wherein the signals with different frequencies have orthorhombic I and Q components; the signals generated by one part of multiple frequency dividers are input into the frequency mixer, so that a local oscillator signal is generated; and the rest parts of the frequency dividers are mutually connnected to the frequency mixer, and are used for selecting the required frequency. Moreover, the invention also provides a fast frequency hopping method which can be applied to the low-stray rapid-frequency-hopping frequency synthesizer.
Description
Technical field
The present invention relates to the frequency synthesis technique in the rf receiver and transmitter, relate in particular to a kind of fast frequency-hopped method of hanging down spuious fast frequency-hopped frequency synthesizer and being applied to it.
Background technology
Recently, in field of wireless communications systems, carry out the research about OFDM (OFDM) just energetically, this to the high speed data transfer through wireless channel of great use.OFDM is a kind of scheme of using multicarrier to send data, is one type and before sending, the circulation of serial incoming symbol is changed to parallel symbol and utilizes the multi-carrier modulation such as a plurality of each symbol of quadrature subcarrier modulation of channel subcarrier.
In the broadband wireless communications field, for example based on the radio ultra wide band system of MB-OFDM technology, fast frequency-hopped frequency synthesizer just is widely used.Particularly, in the MB-OFDM radio ultra wide band system, the output of frequency synthesizer need be switched between 3 Frequency points with predetermined order, and this switching need be accomplished within 9.5 nanoseconds.
Traditional frequency synthesizer is based on the reponse system of phase-locked loop.Its frequency switching time depends on loop bandwidth, and representative value is about tens of microseconds.Therefore the frequency synthesizer based on phase-locked loop can't satisfy fast frequency-hopped needs.A kind of simple solution is to adopt a plurality of phase-locked loops and gate.A plurality of phase-locked loops are worked simultaneously, but have only the output of a phase-locked loop to pass through gate sometime.Frequency switching time only depends on response but not the loop bandwidth of phase-locked loop of gate like this.But a plurality of phase-locked loops comprise a plurality of oscillators and loop filter, can roll up used area of circuit and power consumption.
Summary of the invention
To the above-mentioned deficiency of prior art, the present invention proposes a kind of brand-new solution.
According to an aspect of the present invention, proposed a kind of low spuious fast frequency-hopped frequency synthesizer, having comprised: single phase-locked loop produces the signal of a fixed frequency; A plurality of frequency dividers, level is coupled to after the said phase-locked loop successively, and in order to generate the signal of different frequency, the signal of wherein said different frequency all has the I and the Q two-way component of quadrature; Frequency mixer, the signal that a part generated of said a plurality of frequency dividers is transfused to said frequency mixer, to produce local oscillation signal; And gate, be connected with the remainder and the said frequency mixer of said frequency divider, in order to select required frequency.
In addition, according to a preferred embodiment of the present invention, in above-mentioned low spuious fast frequency-hopped frequency synthesizer, said frequency divider is to remove 2 frequency dividers.
In addition, according to a preferred embodiment of the present invention, in above-mentioned low spuious fast frequency-hopped frequency synthesizer, said frequency mixer is the quadrature single sideband mixer.
In addition, according to a preferred embodiment of the present invention, in above-mentioned low spuious fast frequency-hopped frequency synthesizer, also comprise: multiphase filter, the input that is arranged at said frequency mixer is before to eliminate spurious signal.
In addition, according to a preferred embodiment of the present invention, in above-mentioned low spuious fast frequency-hopped frequency synthesizer, said spurious signal is 3 order harmonic component during a road of said frequency mixer is imported.
In addition; According to a preferred embodiment of the present invention; In above-mentioned low spuious fast frequency-hopped frequency synthesizer, said multiphase filter is made up of two-stage resistance-capacitance, electric capacity-resistor network and has to two inputs of said I road component and two inputs that are directed against said Q road component.
According to a further aspect in the invention, proposed a kind of fast frequency-hopped method, having comprised: the signal that generates a fixed frequency; Signal to this fixed frequency carries out multistage frequency division, to obtain a plurality of I and Q two-way component and frequency various signals with quadrature; Said a plurality of parts in the signal of frequency division are carried out mixing; With said a plurality of remainders in the signal of frequency division with import a gate through the signal of mixing; And by the required frequency of said gate selection.
In addition, according to a preferred embodiment of the present invention, in above-mentioned fast frequency-hopped method, each grade frequency division in the said multistage frequency division all is to remove 2 frequency divisions.
In addition; According to a preferred embodiment of the present invention; In above-mentioned fast frequency-hopped method, after the step of said multistage frequency division and before said step of carrying out mixing, also comprise: utilize a multiphase filter to eliminate to carry out 3 order harmonic component in one tunnel input of mixing.
To sum up; Low spuious fast frequency-hopped frequency synthesizer of the present invention comprises a phase-locked loop, several multiphase filters, several quadrature single sideband mixers, several gates and other circuit; The local oscillation signal among the MB-OFDM UWB can be produced, and quick switching can be realized between several frequencies less than 6ns.Simultaneously, the spurious signal that is produced through adopting multinomial filter effectively to reduce single sideband mixer.
Should be appreciated that the above generality of the present invention is described and following detailed description all is exemplary and illustrative, and be intended to further explanation is provided for as claimed in claim the present invention.
Description of drawings
Comprise that accompanying drawing is for providing the present invention further to be understood, they are included and are constituted the application's a part, and accompanying drawing shows embodiments of the invention, and play the effect of explaining the principle of the invention with this specification.In the accompanying drawing:
Fig. 1 shows the sketch map of low spuious fast frequency-hopped frequency synthesizer according to a preferred embodiment of the present invention.
Fig. 2 schematically shows the structure chart of multiphase filter.
Fig. 3 shows the flow chart according to the fast frequency-hopped method of a preferred embodiment.
Embodiment
Now with embodiments of the present invention will be described by referring to the drawings in detail.
Fig. 1 shows the sketch map of low spuious fast frequency-hopped frequency synthesizer according to a preferred embodiment of the present invention.In the embodiment shown in fig. 1, low spuious fast frequency-hopped frequency synthesizer of the present invention mainly comprises: single phase-locked loop 101, a plurality of frequency divider 102-1～102-5, frequency mixer 103, gate 104 and multiphase filter 106.
According to the present invention, only need single phase-locked loop 101,101 signals that need to produce a fixed frequency of this phase-locked loop.In Fig. 1, frequency divider 102-1～102-5 level successively is coupled to after this phase-locked loop 101, thereby can generate the signal of different frequency.Particularly, according to a preferred embodiment of the invention, the said frequency divider 102-1～102-5 of above-mentioned frequency divider all selects for use and removes 2 frequency dividers.For example; Suppose that the said fixing frequency is 8.448GHz (being applicable to MB-OFDM UWB), then in the example depicted in fig. 1, frequency divider 102-1 is the signal of 4.224GHz with generated frequency; Frequency divider 102-2 is the signal of 2.112GHz with generated frequency; Frequency divider 102-3 is the signal of 1.056GHz with generated frequency, and frequency divider 102-4 is the signal of 528MHz with generated frequency, and frequency divider 102-5 is the signal of 264MHz with generated frequency.Wherein, the signal of these different frequencies all has the I and the Q two-way component of quadrature.
Among Fig. 1, a frequency mixer 103 is with the part in a plurality of frequency dividers, and promptly frequency divider 102-3 and 102-4 are connected.Therefore, the signal that frequency divider 102-3 and 102-4 are generated is transfused to this frequency mixer 103, to produce the local oscillation signal among the required MB-OFDM UWB.Certainly, also can select two or more frequency mixers for use, and the input of these frequency mixers can be the combination in any of the output of above-mentioned a plurality of frequency divider and other frequency mixer.Preferably, in each embodiment of following description, frequency mixer 103 adopts the quadrature single sideband mixer.
At last, as shown in Figure 1, two gates 104 are connected with the remainder and the frequency mixer of said a plurality of frequency dividers respectively, in order to select required sometime frequency.
Usually, quadrature single sideband mixer 103 also can produce unwanted spurious signal extraly when producing desired signal.A kind of important spurious signal generation mechanism is 3 order harmonic component in 103 one tunnel inputs of quadrature single sideband mixer.For example, in the example of above-mentioned Fig. 1, when producing the 4.488GHz signal with 4.224GHz and 264MHz mixing, 4.224GHz also can produce the spurious signal of 3.432GHz (4.224-3*0.264) with 3 order harmonic component of 264MHz.If suppose that the 264MHz signal that produces except that 2 frequency dividers is a square wave, this spurious signal will only be lower than the about 10dB of required local oscillation signal.The method of traditional filtering harmonic component is to adopt LPF.But the signal frequency here is higher, adopts active filtering need consume a large amount of power consumptions and area.And adopt passive type filtering to be difficult to realize the strong required higher order filter that suppresses, and the passive type filter can cause decay to signal.
To the problems referred to above, according to a preferred embodiment, the present invention utilizes the characteristic of quadrature single sideband mixer 103, at one tunnel input adding multiphase filter (Poly Phase Filter is called for short PPF) 105 of this frequency mixer 103.Because fundamental frequency is opposite with its 3 order component I, Q phase place, this multiphase filter 105 can be used for eliminating 3 order components and not influence fundamental frequency.As shown in Figure 1, in the two-way input of frequency mixer 103, all be provided with multiphase filter 105.Be appreciated that; Such setting is not to be necessary; The person of ordinary skill in the field can select according to actual needs only at certain a multiphase filter to be set on the way, also can on other road, multiphase filter be set, to play the effect of eliminating spurious signal.
Fig. 2 schematically shows the structure chart of multiphase filter.As shown in Figure 2, multiphase filter by simple two-stage resistance-capacitance, electric capacity-resistor network constitutes and have to two inputs of I road component and to two inputs of Q road component.The basic functional principle of this multiphase filter is: when the phase place of its input port signal IIP, IQP, IIN and IQN be respectively 0 degree ,-90 degree, when 180 degree and 90 are spent, signal can pass through filter like 6dB with less consumption; When the phase place of its input port signal IIP, IQP, IIN and IQN be respectively 0 degree, 90 degree, when 180 degree and-90 are spent, signal will be by decay significantly.Because the phase place of the fundamental frequency of one group of difference quadrature signal and its 3 order components is just the opposite, so can easily obtain to suppress greater than 3 order components of 30dB in the output of multiphase filter.
Further discuss according to a kind of fast frequency-hopped method that can be applicable to above-mentioned low spuious fast frequency-hopped frequency synthesizer of the present invention below in conjunction with accompanying drawing 3.As shown in Figure 3, fast frequency-hopped method 300 according to the present invention mainly comprises:
Step 301 generates the signal of a fixed frequency;
Step 302 is carried out multistage frequency division to the signal of this fixed frequency, and to obtain a plurality of I and Q two-way component and frequency various signals with quadrature, each grade frequency division in the wherein said multistage frequency division preferably all is to remove 2 frequency divisions;
Step 303 is carried out mixing to said a plurality of parts in the signal of frequency division;
Step 304, with said a plurality of remainders in the signal of frequency division with import a gate through the signal of mixing; And
Step 305 is selected required frequency by said gate.
According to a preferred embodiment of the present invention; After the step 302 of above-mentioned multistage frequency division and before above-mentioned step 303 of carrying out mixing, can further include the step of 3 order harmonic component in the road input that utilizes a multiphase filter to eliminate to carry out mixing.
Low spuious fast frequency-hopped frequency synthesizer of the present invention can be in the quick switching that realizes on the basis of a phase-locked loop between several frequencies.Simultaneously, the spurious signal that is produced through adopting multinomial filter effectively to reduce single sideband mixer.
Those skilled in the art can be obvious, can carry out various modifications and modification and without departing from the spirit and scope of the present invention to above-mentioned exemplary embodiment of the present invention.Therefore, be intended to that the present invention is covered and drop in appended claims and the come scope thereof to modification of the present invention and modification.
Claims (9)
1. one kind is hanged down spuious fast frequency-hopped frequency synthesizer, comprising:
Single phase-locked loop produces the signal of a fixed frequency;
A plurality of frequency dividers, level is coupled to after the said phase-locked loop successively, and in order to generate the signal of different frequency, the signal of wherein said different frequency all has the I and the Q two-way component of quadrature;
Frequency mixer, the signal that a part generated of said a plurality of frequency dividers is transfused to said frequency mixer, to produce local oscillation signal; And
Gate is connected with the remainder and the said frequency mixer of said frequency divider, in order to select required frequency.
2. low spuious fast frequency-hopped frequency synthesizer as claimed in claim 1 is characterized in that said frequency divider is to remove 2 frequency dividers.
3. low spuious fast frequency-hopped frequency synthesizer as claimed in claim 1 is characterized in that said frequency mixer is the quadrature single sideband mixer.
4. low spuious fast frequency-hopped frequency synthesizer as claimed in claim 1 is characterized in that, also comprises:
Multiphase filter, the input that is arranged at said frequency mixer is before to eliminate spurious signal.
5. low spuious fast frequency-hopped frequency synthesizer as claimed in claim 4 is characterized in that, said spurious signal is 3 order harmonic component during a road of said frequency mixer is imported.
6. low spuious fast frequency-hopped frequency synthesizer as claimed in claim 4; It is characterized in that said multiphase filter is made up of two-stage resistance-capacitance, electric capacity-resistor network and has to two inputs of said I road component and two inputs that are directed against said Q road component.
7. fast frequency-hopped method comprises:
Generate the signal of a fixed frequency;
Signal to this fixed frequency carries out multistage frequency division, to obtain a plurality of I and Q two-way component and frequency various signals with quadrature;
Said a plurality of parts in the signal of frequency division are carried out mixing;
With said a plurality of remainders in the signal of frequency division with import a gate through the signal of mixing; And
Select required frequency by said gate.
8. fast frequency-hopped method as claimed in claim 7 is characterized in that, each grade frequency division in the said multistage frequency division all is to remove 2 frequency divisions.
9. fast frequency-hopped method as claimed in claim 7 is characterized in that, after the step of said multistage frequency division and before said step of carrying out mixing, also comprises:
Utilize a multiphase filter to eliminate to carry out 3 order harmonic component in one tunnel input of mixing.
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| CN2011101309235A CN102790616A (en) | 2011-05-19 | 2011-05-19 | Low-stray rapid-frequency-hopping frequency synthesizer and fast frequency hopping method applying same |
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| CN2011101309235A CN102790616A (en) | 2011-05-19 | 2011-05-19 | Low-stray rapid-frequency-hopping frequency synthesizer and fast frequency hopping method applying same |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104601170A (en) * | 2014-11-28 | 2015-05-06 | 中国电子科技集团公司第二十九研究所 | Fast phase locked loop circuit |
| WO2016206337A1 (en) * | 2015-06-26 | 2016-12-29 | 深圳市中兴微电子技术有限公司 | Circuit and method of configuring local oscillator signal and storage medium |
| CN106374919A (en) * | 2016-11-22 | 2017-02-01 | 章策珉 | Frequency expanding device based on multipath selector |
| CN113437941A (en) * | 2021-06-11 | 2021-09-24 | 电子科技大学 | High-linearity single-sideband mixer with high sideband suppression |
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| US20090315611A1 (en) * | 2008-06-24 | 2009-12-24 | Ralink Technology Corporation | Quadrature mixer circuit |
| CN201541235U (en) * | 2009-11-19 | 2010-08-04 | 成都九洲迪飞科技有限责任公司 | Microwave signal source module |
| CN101867545A (en) * | 2010-05-31 | 2010-10-20 | 西安交通大学 | Frequency synthesizer of full-frequency range multi-band orthogonal frequency division multiplexing ultra-wideband radio frequency transceiver |
| CN102064846A (en) * | 2006-12-22 | 2011-05-18 | 财团法人工业技术研究院 | Frequency synthesizer and frequency synthesizing method |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102064846A (en) * | 2006-12-22 | 2011-05-18 | 财团法人工业技术研究院 | Frequency synthesizer and frequency synthesizing method |
| US20090315611A1 (en) * | 2008-06-24 | 2009-12-24 | Ralink Technology Corporation | Quadrature mixer circuit |
| CN201541235U (en) * | 2009-11-19 | 2010-08-04 | 成都九洲迪飞科技有限责任公司 | Microwave signal source module |
| CN101867545A (en) * | 2010-05-31 | 2010-10-20 | 西安交通大学 | Frequency synthesizer of full-frequency range multi-band orthogonal frequency division multiplexing ultra-wideband radio frequency transceiver |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104601170A (en) * | 2014-11-28 | 2015-05-06 | 中国电子科技集团公司第二十九研究所 | Fast phase locked loop circuit |
| WO2016206337A1 (en) * | 2015-06-26 | 2016-12-29 | 深圳市中兴微电子技术有限公司 | Circuit and method of configuring local oscillator signal and storage medium |
| CN106374919A (en) * | 2016-11-22 | 2017-02-01 | 章策珉 | Frequency expanding device based on multipath selector |
| CN106374919B (en) * | 2016-11-22 | 2020-02-18 | 成都仕芯半导体有限公司 | Frequency expanding device based on multi-path selector |
| CN113437941A (en) * | 2021-06-11 | 2021-09-24 | 电子科技大学 | High-linearity single-sideband mixer with high sideband suppression |
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Application publication date: 20121121 |