CN102104380A - Frequency synthesizer - Google Patents
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- CN102104380A CN102104380A CN2009102427640A CN200910242764A CN102104380A CN 102104380 A CN102104380 A CN 102104380A CN 2009102427640 A CN2009102427640 A CN 2009102427640A CN 200910242764 A CN200910242764 A CN 200910242764A CN 102104380 A CN102104380 A CN 102104380A
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Abstract
The invention discloses a frequency synthesizer used for generating five 6 to 9 GHz-centre frequencies corresponding to frequency bands of a multi-band orthogonal frequency division multiplexing ultra-wide band. The frequency synthesizer generates five 6 to 9 GHz-frequency components meeting a multi-band orthogonal frequency division multiplexing ultra-wide band requirement by adopting two phase-locked loops with fixed frequency, an either-or selector, a multi-phase divide-by-2 frequency divider, and a single sideband frequency mixer, wherein the frequency synthesizer adopts a direct frequency synthesis technology, and outputs five frequencies such as 6600 MHz, 7128 MHz, 7656 MHz, 8184 MHz and 8712 MHz by performing operations such as frequency addition, frequency subtraction, or frequency direct connection or the like on the frequencies generated by a phase-locked loop 1 and a phase-locked loop 2 in the single sideband frequency mixture 5; the transition switch of the frequencies are controlled by external digital signals; and the switch time of the frequencies depends on the switch time (nanosecond magnitude) of a switch so as to meet a requirement on fast frequency hopping of a multi-band orthogonal frequency division multiplexing ultra-wide band communication system.
Description
Technical field
The present invention relates to the broadband RF communication technical field, particularly a kind of frequency synthesizer that is used to produce 6 to 9GHz corresponding centre frequencies of five frequency bands of Mb-ofdm ultra broadband.
Background technology
The UWB technology is mainly used in and realizes short distance, superfast radio communication, and generally in 10m, transmission rate can reach 480Mb/s even higher to its transmission range at present.UWB high transfer rate, low-power consumption and do not disturb the characteristics of existing wireless system make UWB become now and the focus in the coming five years.
US Federal Communication Committee (FCC) is 3.1GHz-10.6GHz for the spectral range that UWB divides, and transmit power spectral density must not be greater than-41.2dBm/MHz.In view of the restriction of technology and the design difficulty of high frequency, initial interest concentrates on the application of 3.1GHz-4.9GHz.The Mb-ofdm ultra broadband of WiMedia alliance (hereinafter to be referred as MB-OFDM UWB) standard code, ofdm signal is become by 128 sub carrier group, and these carrier occupancies 528MHz is so subcarrier spacing is 4.125MHz.Because the carrier spacing is 4.125MHz, causing the OFDM symbol lengths must be 1/4.125e6=242.42ns.Consider intersymbol interference, preferably total OFDM symbol lengths is 312.5ns.5 band edges of 128 subcarriers are set to zero, thereby actual occupied bandwidth only is 507.375MHz (slightly being wider than desired 500MHz).
The UWB frequency spectrum is divided into 14 frequency bands (Band) from 3.1-10.6-GHz, and each frequency band 528MHz has hinted 14 carrier frequencies.These frequencies are by further grouping (Group), and every group has two or three adjacent frequency bands, see also shown in Figure 1.
The UWB technology has realized two quantum jumps, aspect spectrum division, starts " coexistence " situation; Aspect transmission speed, really to have moved towards at a high speed, it comes the raising capacity by increasing bandwidth, becomes important in wireless technology " at a high speed " change.
Frequency synthesizer is based on the important circuit module in the UWB transceiver of OFDM technology, it also is the design difficulty of whole transceiver chip, it need be when keeping spectral purity, can jump to another carrier wave from a carrier wave in 9.47ns, this is that frequency synthesizer structure institute in the traditional narrow wireless communication system is incompetent.In addition, the area of frequency synthesizer and power consumption all occupy the ratio about 50% in whole wireless receiving and dispatching machine chip.Therefore, design a simple in structure, area is little, frequency synthesizer low in energy consumption, that satisfy frequency hopping time requirement can greatly reduce the UWB system cost undoubtedly and promote product competitiveness.
At present, industrial quarters and academia have following three kinds usually on MB-OFDM UWB frequency synthesizer implementation:
1, realizes that 3.1-10.6GHz full range band satisfies needed 14 frequencies of MB-OFDM UWB;
2, realize that 3.1-4.5GHz group of subbands Group1 satisfies needed 3 frequencies among the MB-OFDM UWB;
3, realize that 3.1-8.5GHz group of subbands Group1, Group2 and Group3 satisfy needed 9 frequencies among the MB-OFDM UWB.
The UWB frequency spectrum of world major country planning in the comparison diagram 1, we find that the UWB frequency spectrum concentrates in the 6-9GHz frequency range, contain the frequency band group Group3 and the Group6 that satisfy MB-OFDM UWB standard.In the 6-9GHz frequency range, all there is the shortcoming of specific aim deficiency in above-mentioned three kinds of frequency synthesizer implementations, or undue cover the waste that causes hardware, area, power consumption, thereby or cover and lowly cause 5 frequencies in the 6-9GHz frequency range to make full use of influencing channel capacity.
Summary of the invention
(1) technical problem that will solve
In view of this, main purpose of the present invention is to provide a kind of frequency synthesizer that is used to produce 6 to 9GHz corresponding centre frequencies of five frequency bands of Mb-ofdm ultra broadband, more excellent on area and power consumption, to accomplish simultaneously, satisfy the requirement of UWB communication system.
(2) technical scheme
For achieving the above object, the invention provides a kind of frequency synthesizer, be used to produce 6 to 9GHz corresponding centre frequencies of five frequency bands of Mb-ofdm ultra broadband, this frequency synthesizer comprises:
The first fixed frequency phase-locked loop, this first fixed frequency phase-locked loop is a reference frequency signal with the 66MHz signal, include two in the based on feedback link successively and remove two-divider and one and remove 29 frequency dividers, export stable 7656MHz orthogonal signalling to single sideband mixer;
The second fixed frequency phase-locked loop, this second fixed frequency phase-locked loop is a reference frequency signal with the 66MHz signal, including two in the based on feedback link successively removes two-divider and one and removes 16 frequency dividers, in scaling-down process, produce stable 1056MHz orthogonal signalling and stable 2112MHz orthogonal signalling, and this 1056MHz and 2112MHz orthogonal signalling are exported to the alternative selector jointly;
The alternative selector is used for the 1056MHz and the 2112MHz orthogonal signalling that are received from the second fixed frequency phase-locked loop are selected to export to leggy except that two-divider;
Leggy removes two-divider, is used for the single sideband mixer of exporting to that signal with the output of alternative selector carries out two divided-frequency and produces out of phase, adds deduct with the control single sideband mixer;
Single sideband mixer, the 7656MHz orthogonal signalling that are used for being received from the first fixed frequency phase-locked loop are removed the 528MHz orthogonal signalling of two-divider or 1056MHz orthogonal signalling or DC signal and are carried out mixing with being received from leggy, obtain 6600MHz, 7128MHz, 7656MHz, 8184MHz and five positive blending output signals of 8712MHz.
In the such scheme, the described first fixed frequency phase-locked loop adopts the orthogonal voltage-controlled vibrator that directly produces the quadrature two paths of signals, avoid adopting the doubled frequency voltage controlled oscillator by method, thereby can adopt the lower fixed frequency phase-locked loop of frequency except that two divided-frequency generation orthogonal signalling.
In the such scheme, the described second fixed frequency phase-locked loop adopts the method for two divided-frequency to produce 2 groups of orthogonal signalling, realizes orthogonal property.
In the such scheme, described leggy removes the two divided-frequency signal of two-divider output out of phase, and the control single sideband mixer produces the signal that adds deduct.
In the such scheme, this frequency synthesizer adopts the method for direct conversion to produce the signal of each required frequency, remove two-divider by MUX and leggy then and from the signal that produces, select required signal, frequency hopping speed between each frequency depends on the speed of switch, realizes the frequency hopping speed of nanosecond.
(3) beneficial effect
From technique scheme as can be seen, the present invention has following beneficial effect:
1, the frequency synthesizer that is used to produce 6 to 9GHz corresponding centre frequencies of five frequency bands of Mb-ofdm ultra broadband provided by the invention, adopt two fixed frequency phase-locked loops, a single sideband mixer, a MUX and a leggy to remove two-divider and produce five tunnel 6 to 9GHz UWB local oscillation signal, the frequency and the frequency hopping speed of frequency synthesizer have been improved, satisfied the requirement of UWB communication system, on area and power consumption, compared simultaneously and also obtained optimization (this point from table 1 employed inductance quantity as can be known) with traditional scheme.
2, the frequency synthesizer that is used to produce 6 to 9GHz corresponding centre frequencies of five frequency bands of Mb-ofdm ultra broadband provided by the invention has only been used a SSB frequency mixer, and what reduced that repeatedly mixing produced is spuious, has improved spectral purity; The frequency hopping time can reach nanosecond order, satisfies the UWB system requirements.
3, the frequency synthesizer that is used to produce 6 to 9GHz corresponding centre frequencies of five frequency bands of Mb-ofdm ultra broadband provided by the invention, produce the signal of needed each frequency by the way that adopts direct conversion, select the signal of needs then by an alternative selector, frequency hopping speed between each frequency just only depends on the switch speed of switch like this, can realize the frequency hopping speed of nanosecond fully, satisfy the requirement of UWB communication system.
4, the frequency synthesizer that is used to produce 6 to 9GHz corresponding centre frequencies of five frequency bands of Mb-ofdm ultra broadband provided by the invention, high frequency phase locked loop has adopted the quadrature VCO of direct generation quadrature two paths of signals, needing to have avoided design doubled frequency VCO to produce the method for orthogonal signalling then by two divided-frequency, thereby can adopt the lower PLL of frequency, reduce realization difficulty and the consumed current of this PLL.
5, the frequency synthesizer that is used to produce 6 to 9GHz corresponding centre frequencies of five frequency bands of Mb-ofdm ultra broadband provided by the invention, low-frequency phase-locking ring adopts and produces the doubled frequency method generation orthogonal signalling of frequency division then, has improved the orthogonality that produces signal.
6, the frequency synthesizer that is used to produce 6 to 9GHz corresponding centre frequencies of five frequency bands of Mb-ofdm ultra broadband provided by the invention, thereby the output signal that has adopted leggy to remove two-divider generation out of phase is controlled adding deduct of single sideband mixer, has reduced the hardware cost of single sideband mixer.
Description of drawings
Fig. 1 shows the corresponding frequency range of licensing with major country of figure of the subband structure in the ECMA-368MB-OFDM UWB standard;
Fig. 2 is the structured flowchart of the frequency synthesizer of 6 to 9GHz the corresponding centre frequencies of five frequency bands that are used to produce the Mb-ofdm ultra broadband provided by the invention.
Fig. 3 is the comparison table of prototype of the present invention and other similar Design.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, below in conjunction with specific embodiment, and with reference to accompanying drawing, the present invention is described in more detail.
The frequency synthesizer that is used to produce 6 to 9GHz corresponding centre frequencies of five frequency bands of Mb-ofdm ultra broadband provided by the invention, the phase-locked loop by adopting two fixed frequencies, alternative selector, leggy remove two-divider and a monolateral band (SSB) frequency mixer and have produced 6 to 9GHz five frequency components that satisfy the requirement of Mb-ofdm ultra broadband.Wherein this frequency synthesizer adopts direct frequency synthesis technique, in single sideband mixer 5, carry out frequency plus-minus or operation such as straight-through by the frequency that phase-locked loop 1 and phase-locked loop 2 produced, thereby output 6600MHz, 7128MHz, 7656MHz, 8184MHz, five frequencies of 8712MHz, the saltus step switching of frequency is controlled by external digital signal, rely on the switching time (nanosecond order) of switch the switching time of frequency, can satisfy the fast frequency-hopped requirement of Mb-ofdm ultra-wideband communication system.
As shown in Figure 2, Fig. 2 is the structured flowchart of the frequency synthesizer of 6 to 9GHz the corresponding centre frequencies of five frequency bands that are used to produce the Mb-ofdm ultra broadband provided by the invention, and this frequency synthesizer comprises that the first fixed frequency phase-locked loop 1, the second fixed frequency phase-locked loop 2, alternative selector 3, leggy remove two-divider 4 and single sideband mixer 5.
Wherein, the first fixed frequency phase-locked loop 1, this first fixed frequency phase-locked loop is a reference frequency signal with the 66MHz signal, includes two in the based on feedback link successively and removes two-divider and one and remove 29 frequency dividers; Wherein the reference signal of 66MHz passes to phase frequency detector and charge pump with the 66MHz signal that feeds back except that 29 frequency dividers, phase frequency detector and charge pump are by phase difference and difference on the frequency between more described reference signal and the described feedback signal, error signal is converted to the extraction electric current or the output current of charge pump, flow through three rank resistance capacitance (RC) loop filters of next stage of this electric current, produce a voltage signal U who is subjected to the error modulation, this voltage signal passes to orthogonal voltage-controlled vibrator through loop filter, produces stable 7656MHz orthogonal signalling to single sideband mixer 5.
The second fixed frequency phase-locked loop 2, this second fixed frequency phase-locked loop is a reference frequency signal with the 66MHz signal, includes two in the based on feedback link successively and removes two-divider and one and remove 16 frequency dividers; First removes two-divider and produces stable 2112MHz orthogonal signalling in scaling-down process, and second frequency divider produces stable 1056MHz orthogonal signalling, and this 1056MHz and 2112MHz orthogonal signalling are exported to alternative selector 3 jointly; Wherein the reference signal of 66MHz passes to phase frequency detector and charge pump with the 66MHz signal that feeds back except that 16 frequency dividers, phase frequency detector and charge pump are by phase difference and difference on the frequency between more described reference signal and the described feedback signal, error signal is converted to the extraction electric current or the output current of charge pump, flow through three rank resistance capacitance (RC) loop filters of next stage of this electric current, produce a voltage signal U who is subjected to the error modulation, this voltage signal passes to voltage controlled oscillator through loop filter, produces a stable 4224MHz signal.
Leggy removes two-divider 4, and what be used for that signal with MUX 3 outputs removes two divided-frequency and produce out of phase exports to single sideband mixer 5, adds deduct to control single sideband mixer 5.
The above-mentioned first fixed frequency phase-locked loop 1 adopts the QVCO that directly produces the quadrature two paths of signals, avoids adopting doubled frequency VCO to produce the method for orthogonal signalling then by two divided-frequency, thereby adopts the lower fixed frequency phase-locked loop of frequency; The second fixed frequency phase-locked loop 2 has adopted the method for two divided-frequency to produce orthogonal signalling, thereby obtains good orthogonal signalling.
What above-mentioned leggy removed that two-divider 4 can export out of phase removes the two divided-frequency signal, thereby the control single sideband mixer produces the signal that adds deduct; This frequency synthesizer produces the signal of needed each frequency by the method that adopts direct conversion, remove the signal that two-divider 4 is selected needs by MUX 3 and leggy then, frequency hopping speed between each frequency depends on the speed of switch, has realized the frequency hopping speed of nanosecond.
Refer again to Fig. 2, this frequency synthesizer has comprised following circuit module: the leggy that 7656MHz integer P LL 1,4224MHz integer P LL 2, the MUX 3 of selecting 1056MHz and 2112MHz two paths of signals, realization 1056MHz and 2112MHz remove two divided-frequency removes two-divider 4, realizes the single sideband mixer 5 of 7656MHz and 528MHz or 1056MHz or DC mixing.
To provide concrete frequency synthesis scheme below:
What the PLL 1 of 7656MHz adopted is the crystal oscillator frequency of 66MHz, and frequency dividing ratio is 2 * 2 * 29, has finally produced the output of 66M * 2 * 2 * 29=7656MHz, and the VCO of this phase-locked loop adopts the quadrature VCO that can directly produce the quadrature two paths of signals.
What the PLL 2 of 4224MHz adopted also is the crystal oscillator frequency of 66MHz, frequency dividing ratio is 2 * 2 * 16, the final output that produces 66M * 2 * 2 * 16=4224MHz, in the scaling-down process of this phase-locked loop, produced the signal of 1056MHz and 2112MHz, these two additional signals will provide input for leggy removes two-divider, and the selection of this two paths of signals is realized by a data selector 3.
Leggy removes two-divider 4 1056MHz or the 2112MHz signal that MUX 3 provides is carried out two-divider generation 512MHz or 1056MHz signal, thereby and can provide the output signal of a plurality of phase places to control adding deduct of single sideband mixer.
With the input of 7656MHz signal as SSB Mixer, the another one input is for removing 528MHz or 1056MHz or the DC signal that two-divider 4 provides, afterwards can produce the center frequency signal that frequency is 6600MHz, 7128MHz, 7656MHz, 8184MHz and five frequency bands of 8712MHz through single sideband mixing, finally remove the mid-band frequency signal that two-divider 4 is controlled needs generation by control alternative selector (3) and leggy.
This 6 to 9GHz five band frequency synthesizers that are used for MB-OFDM UWB provided by the invention, by adopting direct frequency synthesis technique, can export the local oscillation signal of 6600MHz, 7128MHz, 7656MHz, 8184MHz and five mid-band frequencies of 8712MHz, and the frequency hopping time between each frequency can be satisfied the fast frequency-hopped requirement of MB-OFDM UWB communication system at nanosecond order.
In addition, this frequency synthesizer has been exported quadrature two-way local oscillation signal, can be applied in the UWB transceiver of Direct Conversion.
Above-described specific embodiment; purpose of the present invention, technical scheme and beneficial effect are further described; institute is understood that; the above only is specific embodiments of the invention; be not limited to the present invention; within the spirit and principles in the present invention all, any modification of being made, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (5)
1. frequency synthesizer is used to produce 6 to 9GHz corresponding centre frequencies of five frequency bands of Mb-ofdm ultra broadband, it is characterized in that this frequency synthesizer comprises:
The first fixed frequency phase-locked loop, this first fixed frequency phase-locked loop is a reference frequency signal with the 66MHz signal, include two in the based on feedback link successively and remove two-divider and one and remove 29 frequency dividers, export stable 7656MHz orthogonal signalling to single sideband mixer;
The second fixed frequency phase-locked loop, this second fixed frequency phase-locked loop is a reference frequency signal with the 66MHz signal, including two in the based on feedback link successively removes two-divider and one and removes 16 frequency dividers, in scaling-down process, produce stable 1056MHz orthogonal signalling and stable 2112MHz orthogonal signalling, and this 1056MHz and 2112MHz orthogonal signalling are exported to the alternative selector jointly;
The alternative selector is used for the 1056MHz and the 2112MHz orthogonal signalling that are received from the second fixed frequency phase-locked loop are selected to export to leggy except that two-divider;
Leggy removes two-divider, is used for the single sideband mixer of exporting to that signal with the output of alternative selector carries out two divided-frequency and produces out of phase, adds deduct with the control single sideband mixer;
Single sideband mixer, the 7656MHz orthogonal signalling that are used for being received from the first fixed frequency phase-locked loop are removed the 528MHz orthogonal signalling of two-divider or 1056MHz orthogonal signalling or DC signal and are carried out mixing with being received from leggy, obtain 6600MHz, 7128MHz, 7656MHz, 8184MHz and five positive blending output signals of 8712MHz.
2. 6 to the 9GHz five-band frequency synthesizers that are used for the Mb-ofdm ultra broadband according to claim 1, it is characterized in that, the described first fixed frequency phase-locked loop adopts the orthogonal voltage-controlled vibrator that directly produces the quadrature two paths of signals, avoid adopting the doubled frequency voltage controlled oscillator by method, thereby can adopt the lower fixed frequency phase-locked loop of frequency except that two divided-frequency generation orthogonal signalling.
3. frequency synthesizer according to claim 1 is characterized in that, the described second fixed frequency phase-locked loop adopts the method for two divided-frequency to produce 2 groups of orthogonal signalling, realizes orthogonal property.
4. frequency synthesizer according to claim 1 is characterized in that, described leggy removes the two divided-frequency signal of two-divider output out of phase, and the control single sideband mixer produces the signal that adds deduct.
5. frequency synthesizer according to claim 1, it is characterized in that, this frequency synthesizer adopts the method for direct conversion to produce the signal of each required frequency, remove two-divider by MUX and leggy then and from the signal that produces, select required signal, frequency hopping speed between each frequency depends on the speed of switch, realizes the frequency hopping speed of nanosecond.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009102427640A CN102104380A (en) | 2009-12-16 | 2009-12-16 | Frequency synthesizer |
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| CN2009102427640A CN102104380A (en) | 2009-12-16 | 2009-12-16 | Frequency synthesizer |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110501678A (en) * | 2019-09-29 | 2019-11-26 | 北京无线电测量研究所 | A kind of frequency modulated continuous wave radar transceiver |
| CN111541449A (en) * | 2020-05-07 | 2020-08-14 | 江苏集萃智能集成电路设计技术研究所有限公司 | Ultra-wideband orthogonal local oscillator signal generating device |
| CN113541686A (en) * | 2021-07-23 | 2021-10-22 | 上海壁仞智能科技有限公司 | Frequency switching circuit |
-
2009
- 2009-12-16 CN CN2009102427640A patent/CN102104380A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110501678A (en) * | 2019-09-29 | 2019-11-26 | 北京无线电测量研究所 | A kind of frequency modulated continuous wave radar transceiver |
| CN110501678B (en) * | 2019-09-29 | 2022-03-04 | 北京无线电测量研究所 | Frequency modulation continuous wave radar transceiver |
| CN111541449A (en) * | 2020-05-07 | 2020-08-14 | 江苏集萃智能集成电路设计技术研究所有限公司 | Ultra-wideband orthogonal local oscillator signal generating device |
| CN111541449B (en) * | 2020-05-07 | 2023-08-15 | 江苏集萃智能集成电路设计技术研究所有限公司 | Ultra-wideband orthogonal local oscillator signal generating device |
| CN113541686A (en) * | 2021-07-23 | 2021-10-22 | 上海壁仞智能科技有限公司 | Frequency switching circuit |
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Application publication date: 20110622 |