CN101471660A - 6.3 to 8.5 GHz five-band frequency synthesizer for OFDM UWB - Google Patents
6.3 to 8.5 GHz five-band frequency synthesizer for OFDM UWB Download PDFInfo
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- CN101471660A CN101471660A CNA2007103042504A CN200710304250A CN101471660A CN 101471660 A CN101471660 A CN 101471660A CN A2007103042504 A CNA2007103042504 A CN A2007103042504A CN 200710304250 A CN200710304250 A CN 200710304250A CN 101471660 A CN101471660 A CN 101471660A
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Abstract
The invention discloses a 6.3-8.5 GHz five-band frequency synthesizer for an OFDM UWB. The synthesizer comprises a fixed-frequency phase-locked loop 1, a multiple selector 2 and a single sideband mixer 3. By adopting the direct frequency synthesis technique, the frequency synthesizer can output the local oscillator signals of five bands frequency points of 6336 MHz, 6864 MHz, 7392 MHz, 7920 MHz and 8448 MHz; and the frequency hopping time between the frequency points at nanosecond level can be obtained, so that the demand of fast frequency hopping of the OFDM UWB communication system can be met. Moreover, IQ two path local oscillator signals are output by the frequency synthesizer and can be applied to an UWB wireless transceiver with direct frequency conversion.
Description
Technical field
The present invention relates to OFDM (OFDM) wireless ultra-wideband (UWB) technical field, relate in particular to 6.3 to the 8.5GHz five-band frequency synthesizers of a kind of OFDM of being used for UWB.
Background technology
The UWB technology is mainly used in and realizes short distance, superfast radio communication, and generally in 10m, transmission rate can reach 480M/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.
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.
The UWB chipset will be widely used in enterprise intelligent office (IT), digital home entertainment (CE) and move and use (MC), and UWB chip and product have begun to enter high-end market, and according to the world market prediction, the market annual growth rate will be above 400%.And its growth momentum is accelerated now, and market is huge, and economic benefit is obvious, and prospect is very optimistic.
Frequency synthesizer is based on the important circuit module in the UWB transceiver of OFDM technology, also is the design difficulty of whole transceiver.Compare with the traditional narrow wireless communication system, the frequency synthesizer that is applied to UWB has following difficult point:
1, frequency height (being up to 10GHz);
2, frequency band range wide (several GHz magnitude);
3, frequency hopping speed fast (nanosecond order).
Based on above difficult point, adopt traditional phase-locked ring type frequency synthesizer can't satisfy the requirement of UWB communication system.
Summary of the invention
(1) technical problem that will solve
In view of this, main purpose of the present invention is to provide 6.3 to the 8.5GHz five-band frequency synthesizers of a kind of OFDM of being used for UWB, to improve frequency, frequency bandwidth and the frequency hopping speed of frequency synthesizer, satisfies the requirement of UWB communication system.
(2) technical scheme
For achieving the above object, the invention provides 6.3 to the 8.5GHz five-band frequency synthesizers of a kind of OFDM of being used for UWB, this frequency synthesizer comprises:
Fixed frequency phase-locked loop 1, this fixed frequency phase-locked loop is a reference frequency signal with the 66MHz signal, includes one 7 frequency divider in the based on feedback link successively, one 2 frequency divider and one 8 frequency divider are exported stable 7392MHz orthogonal signalling to single sideband mixer 3; In scaling-down process, produce stable 528MHz orthogonal signalling and stable 1056MHz orthogonal signalling, and this 528MHz and 1056MHz orthogonal signalling are exported to MUX 2 jointly;
MUX 2 is used for and will be received from the 528MHz and the 1056MHz orthogonal signalling of fixed frequency phase-locked loop 1, and the DC signal selects to export to single sideband mixer 3;
In the such scheme, described fixed frequency phase-locked loop 1 adopts the orthogonal voltage-controlled vibrator (VCO) that directly produces the IQ two paths of signals, avoid adopting doubled frequency VCO to produce the method for orthogonal signalling then by two divided-frequency, thereby adopt the lower fixed frequency phase-locked loop of frequency.
In the such scheme, this frequency synthesizer produces the signal of needed each frequency by the method that adopts direct conversion, select the signal of needs then by MUX, the frequency hopping speed between each frequency depends on the switch speed of switch, has realized the frequency hopping speed of nanosecond.
(3) beneficial effect
From technique scheme as can be seen, the present invention has following beneficial effect:
1, this 6.3 to the 8.5GHz five-band frequency synthesizers that are used for OFDM UWB provided by the invention, adopt a fixed frequency phase-locked loop, a single sideband mixer and a MUX to produce five tunnel 6.3 to 8.5GHz UWB local oscillation signal, improve frequency synthesis frequency bandwidth and frequency hopping speed, satisfied the requirement of UWB communication system.
2, this 6.3 to the 8.5GHz five-band frequency synthesizers that are used for OFDM UWB provided by the invention have been saved hardware cost and have been reduced spuious generation; Frequency hopping speed can reach nanosecond order, satisfies the requirement of UWB communication system.
3, this 6.3 to the 8.5GHz five-band frequency synthesizers that are used for OFDM UWB 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 MUX, 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, this 6.3 to the 8.5GHz five-band frequency synthesizers that are used for OFDM UWB provided by the invention, adopted the quadrature VCO of direct generation IQ two paths of signals, needing to avoid design doubled frequency VCO to produce the method for orthogonal signalling then by two divided-frequency, thereby can adopt the lower PLL of frequency.
Description of drawings
Fig. 1 is the structured flowchart of 6.3 to the 8.5GHz five-band frequency synthesizers of the OFDM of being used for UWB provided by the invention.
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.
As shown in Figure 1, Fig. 1 is the structured flowchart of 6.3 to the 8.5GHz five-band frequency synthesizers of the OFDM of being used for UWB provided by the invention, and this frequency synthesizer comprises fixed frequency phase-locked loop 1, MUX 2 and single sideband mixer 3.
Wherein, fixed frequency phase-locked loop 1, this fixed frequency phase-locked loop is a reference frequency signal with the 66MHz signal, includes one 7 frequency divider in the based on feedback link successively, one 2 frequency divider and one 8 frequency divider are exported stable 7392MHz orthogonal signalling to single sideband mixer 3; In scaling-down process, produce stable 528MHz orthogonal signalling and stable 1056MHz orthogonal signalling, and this 528MHz and 1056MHz orthogonal signalling are exported to MUX 2 jointly.
MUX 2 is used for and will be received from the 528MHz and the 1056MHz orthogonal signalling of fixed frequency phase-locked loop 1, and the DC signal selects to export to single sideband mixer 3.
Described fixed frequency phase-locked loop 1 adopts the quadrature VCO that directly produces the IQ 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.
This frequency synthesizer produces the signal of needed each frequency by the method that adopts direct conversion, select the signal of needs then by MUX, frequency hopping speed between each frequency depends on the switch speed of switch, has realized the frequency hopping speed of nanosecond.
Refer again to Fig. 1, this frequency synthesizer has comprised following circuit module: the single sideband mixer (3) of 7392MHz integer P LL (1), the MUX (2) of selecting 528MHz and 1056MHz two paths of signals, realization 7392MHz and 528MHz or 1056MHz mixing.To provide concrete frequency synthesis scheme below:
What the PLL of 7392MHz (1) adopted is the crystal oscillator frequency of 66MHz, frequency dividing ratio is 7 * 2 * 8, finally produced the output of 66M * 7 * 2 * 8=7392MHz, the VCO of this phase-locked loop adopts the quadrature VCO that can directly can produce the IQ two paths of signals, in the scaling-down process of this phase-locked loop, produced the signal of 1056MHz and 528MHz, these two additional signals will provide an input for SSB frequency mixer (3), and the selection of this two paths of signals is realized by a data selector (2).An input of single sideband mixer (3) is the 7392MHz signal, the another one input is 1056MHz or 528MHz signal or DC signal, can produce the signal of 6336MHz, 6864MHz, 7392MHz, 7920MHz, five bands of 8448MHz by single sideband mixer (3), need select the frequency signal of band by MUX (2).
This 6.3 to the 8.5GHz five-band frequency synthesizers that are used for OFDM UWB provided by the invention, by adopting direct frequency synthesis technique, can export the local oscillation signal of 6336MHz, 6864MHz, 7392MHz, 7920MHz, five bands frequencies of 8448MHz, and the frequency hopping time between each frequency can be satisfied the fast frequency-hopped requirement of OFDM UWB communication system at nanosecond order.
In addition, this frequency synthesizer has been exported IQ two-way local oscillation signal, can be applied in the UWB transceiver of Direct Conversion.
Above-described concrete embodiment has carried out further detailed explanation to purpose of the present invention, technical scheme and beneficial effect.Institute it should be understood that the above only for concrete embodiment of the present invention, is not limited to the present invention.All any modifications of being made within the spirit and principles in the present invention, be equal to and replace or improvement etc., all should be included within protection scope of the present invention.
Claims (3)
1, a kind of 6.3 to 8.5GHz five-band frequency synthesizers that are used for the OFDM wireless ultra broadband is characterized in that this frequency synthesizer comprises:
Fixed frequency phase-locked loop (1), this fixed frequency phase-locked loop is a reference frequency signal with the 66MHz signal, include one 7 frequency divider in the based on feedback link successively, one 2 frequency divider and one 8 frequency divider are exported stable 7392MHz orthogonal signalling to single sideband mixer (3); In scaling-down process, produce stable 528MHz orthogonal signalling and stable 1056MHz orthogonal signalling, and this 528MHz and 1056MHz orthogonal signalling are exported to MUX (2) jointly;
MUX (2) is used for and will be received from the 528MHz and the 1056MHz orthogonal signalling of fixed frequency phase-locked loop (1), and the DC signal selects to export to single sideband mixer (3);
Single sideband mixer (3), the 7392MHz orthogonal signalling that are used for being received from fixed frequency phase-locked loop (1) and the 528MHz orthogonal signalling that are received from MUX (2) or 1056MHz orthogonal signalling or DC signal carry out mixing, obtain 6336MHz, 6864MHz, 7392MHz, 7920MHz and five orthogonal signalling of 8448MHz;
2,6.3 to the 8.5GHz five-band frequency synthesizers that are used for the OFDM wireless ultra broadband according to claim 1, it is characterized in that, described fixed frequency phase-locked loop (1) adopts the orthogonal voltage-controlled vibrator VCO that directly produces the IQ two paths of signals, avoid adopting doubled frequency VCO to produce the method for orthogonal signalling then by two divided-frequency, thereby adopt the lower fixed frequency phase-locked loop of frequency.
3,6.3 to the 8.5GHz five-band frequency synthesizers that are used for the OFDM wireless ultra broadband according to claim 1, it is characterized in that, this frequency synthesizer produces the signal of needed each frequency by the method that adopts direct conversion, select the signal of needs then by MUX, frequency hopping speed between each frequency depends on the switch speed of switch, has realized the frequency hopping speed of nanosecond.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2007103042504A CN101471660B (en) | 2007-12-26 | 2007-12-26 | 6.3 to 8.5 GHz five-band frequency synthesizer for OFDM UWB |
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| CN2007103042504A CN101471660B (en) | 2007-12-26 | 2007-12-26 | 6.3 to 8.5 GHz five-band frequency synthesizer for OFDM UWB |
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| CN101471660A true CN101471660A (en) | 2009-07-01 |
| CN101471660B CN101471660B (en) | 2012-04-11 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102437818A (en) * | 2011-09-27 | 2012-05-02 | 无锡里外半导体科技有限公司 | Frequency synthesizer and radio frequency reader |
| CN102611439A (en) * | 2011-01-24 | 2012-07-25 | 中国科学院微电子研究所 | 2:1 structural 40MHz crystal oscillator frequency synthesizer for 60GHz wireless communication |
| CN112367089A (en) * | 2020-10-27 | 2021-02-12 | 上海磐启微电子有限公司 | Radio frequency transmitting device |
-
2007
- 2007-12-26 CN CN2007103042504A patent/CN101471660B/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102611439A (en) * | 2011-01-24 | 2012-07-25 | 中国科学院微电子研究所 | 2:1 structural 40MHz crystal oscillator frequency synthesizer for 60GHz wireless communication |
| CN102437818A (en) * | 2011-09-27 | 2012-05-02 | 无锡里外半导体科技有限公司 | Frequency synthesizer and radio frequency reader |
| CN112367089A (en) * | 2020-10-27 | 2021-02-12 | 上海磐启微电子有限公司 | Radio frequency transmitting device |
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| Publication number | Publication date |
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| CN101471660B (en) | 2012-04-11 |
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