CN101471659B - 5.5 to 7.2 GHz four-band frequency synthesizer for OFDM UWB - Google Patents
5.5 to 7.2 GHz four-band frequency synthesizer for OFDM UWB Download PDFInfo
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- CN101471659B CN101471659B CN2007103038871A CN200710303887A CN101471659B CN 101471659 B CN101471659 B CN 101471659B CN 2007103038871 A CN2007103038871 A CN 2007103038871A CN 200710303887 A CN200710303887 A CN 200710303887A CN 101471659 B CN101471659 B CN 101471659B
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Abstract
The invention discloses a 5.5-7.2 GHz four-band frequency synthesizer for an OFDM UWB. The synthesizer comprises a fixed-frequency phase-locked loop 1, a first single sideband mixer 2, a second single sideband mixer 3, a third single sideband mixer 4 and a multiple selector 5. By adopting the direct frequency synthesis technique, the frequency synthesizer can output the orthogonal local oscillator signals of four frequency points of 5544 MHz, 6072 MHz, 6600 MHz and 7128 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.
Description
Technical field
The present invention relates to OFDM (OFDM) wireless ultra-wideband (UWB) technical field, relate in particular to 5.5 to 7.2GHz four 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 5.5 to 7.2GHz four 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 5.5 to 7.2GHz four 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 44MHz signal, include one 12 frequency divider in the based on feedback link successively, one 2 frequency divider and one 6 frequency divider, export stable 6336MHz orthogonal signalling to the first single sideband mixer 2, in scaling-down process, produce stable 528MHz orthogonal signalling and stable 264MHz orthogonal signalling, and these 528MHz orthogonal signalling are exported to second single sideband mixer 3 and the 3rd single sideband mixer 4 simultaneously, these 264MHz orthogonal signalling are exported to first single sideband mixer 2 simultaneously;
First single sideband mixer 2, the 6336MHz and the 264MHz orthogonal signalling that are used for being received from fixed frequency phase-locked loop 1 are carried out mixing, obtain 6600MHz orthogonal signalling and 6072MHz orthogonal signalling, the 6600MHz orthogonal signalling that obtain are exported to the MUX 5 and second single sideband mixer 3 respectively, the 6072MHz orthogonal signalling that obtain are exported to the 3rd single sideband mixer 4;
Second single sideband mixer 3, the 528MHz orthogonal signalling that are used for will being received from the 6600MHz orthogonal signalling of first single sideband mixer 2 and being received from fixed frequency phase-locked loop 1 are carried out mixing, obtain 6072MHz and 7128MHz orthogonal signalling, and the 6072MHz and the 7128MHz orthogonal signalling that obtain are exported to MUX 5;
The 3rd single sideband mixer 4, the 528MHz orthogonal signalling that are used for will being received from the 6072MHz orthogonal signalling of first single sideband mixer 2 and being received from fixed frequency phase-locked loop 1 are carried out mixing, obtain the 5544MHz orthogonal signalling, and the 5544MHz orthogonal signalling that obtain are exported to MUX 5;
MUX 5, be used for the 6600MHz orthogonal signalling that are received from first single sideband mixer 2, the 6072MHz that is received from second single sideband mixer 3 and 7128MHz orthogonal signalling, and the 5544MHz orthogonal signalling that are received from the 3rd single sideband mixer 4 are selected output.
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.
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 a MUX, the frequency hopping speed between each frequency depends on the switch speed of MUX.
In the such scheme, this frequency synthesizer adopts the mixed frequency signal of the direct frequency synthesis of fractional frequency signal conduct that obtains in the phase lock loop feedback loop road.
(3) beneficial effect
From technique scheme as can be seen, the present invention has following beneficial effect:
1, this 5.5 to 7.2GHz four band frequency synthesizers that are used for OFDM UWB provided by the invention, adopt a fixed frequency phase-locked loop, three single sideband mixers and a MUX to produce four tunnel 5.5 to 7.2GHz UWB local oscillation signal, improve frequency, frequency bandwidth and the frequency hopping speed of frequency synthesizer, satisfied the requirement of UWB communication system.
2, this 5.5 to 7.2GHz four band frequency synthesizers that are used for OFDM UWB provided by the invention only adopt a fixed frequency phase-locked loop (PLL) to produce four output high-frequency signals, thereby realize miniaturization, low cost; Frequency hopping speed can reach nanosecond order, satisfies the UWB system requirements.
3, this 5.5 to 7.2GHz four 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 a MUX, frequency hopping speed between each frequency just only depends on the switch speed of MUX like this, can realize the frequency hopping speed of nanosecond fully, satisfy the requirement of UWB communication system.
4, this 5.5 to 7.2GHz four 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 5.5 to 7.2GHz four 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 5.5 to 7.2GHz four 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, first single sideband mixer 2, second single sideband mixer 3, the 3rd single sideband mixer 4 and MUX 5.
Wherein, fixed frequency phase-locked loop 1, this fixed frequency phase-locked loop is a reference frequency signal with the 44MHz signal, include one 12 frequency divider in the based on feedback link successively, one 2 frequency divider and one 6 frequency divider, export stable 6336MHz orthogonal signalling to the first single sideband mixer 2, in scaling-down process, produce stable 528MHz orthogonal signalling and stable 264MHz orthogonal signalling, and these 528MHz orthogonal signalling are exported to second single sideband mixer 3 and the 3rd single sideband mixer 4 simultaneously, these 264MHz orthogonal signalling are exported to first single sideband mixer 2 simultaneously.
First single sideband mixer 2, the 6336MHz and the 264MHz orthogonal signalling that are used for being received from fixed frequency phase-locked loop 1 are carried out mixing, obtain 6600MHz orthogonal signalling and 6072MHz orthogonal signalling, the 6600MHz orthogonal signalling that obtain are exported to the MUX 5 and second single sideband mixer 3 respectively, the 6072MHz orthogonal signalling that obtain are exported to the 3rd single sideband mixer 4.
Second single sideband mixer 3, the 528MHz orthogonal signalling that are used for will being received from the 6600MHz orthogonal signalling of first single sideband mixer 2 and being received from fixed frequency phase-locked loop 1 are carried out mixing, obtain 6072MHz and 7128MHz orthogonal signalling, and the 6072MHz and the 7128MHz orthogonal signalling that obtain are exported to MUX 5.
The 3rd single sideband mixer 4, the 528MHz orthogonal signalling that are used for will being received from the 6072MHz orthogonal signalling of first single sideband mixer 2 and being received from fixed frequency phase-locked loop 1 are carried out mixing, obtain the 5544MHz orthogonal signalling, and the 5544MHz orthogonal signalling that obtain are exported to MUX 5.
MUX 5, be used for the 6600MHz orthogonal signalling that are received from first single sideband mixer 2, the 6072MHz that is received from second single sideband mixer 3 and 7128MHz orthogonal signalling, and the 5544MHz orthogonal signalling that are received from the 3rd single sideband mixer 4 are selected output.
Described fixed frequency phase-locked loop 1 adopts the orthogonal voltage-controlled vibrator 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 a MUX, frequency hopping speed between each frequency depends on the switch speed of MUX, has realized the frequency hopping speed of nanosecond.
This frequency synthesizer adopts the mixed frequency signal of the direct frequency synthesis of fractional frequency signal conduct that obtains in the phase lock loop feedback loop road, saves extra signal source and frequency divider.
Refer again to Fig. 1, this frequency synthesizer mainly comprises following components, and output frequency is the fixed frequency phase-locked loop of 6336MHz, realizes three single sideband mixers and output frequency MUX of frequency synthesis.
As being depicted as a 6336MHz quadrature phase-locked loop in the figure frame of broken lines.This phase-locked loop is a reference frequency signal with the 44MHz signal, comprises one 12 frequency divider in the based on feedback link, one 2 frequency divider and one 6 frequency divider.This phase-locked loop acting as in whole frequency synthesizer provides stable high-quality 6336MHz signal, and it is 264MHz that frequency is provided simultaneously, and the output signal of 528MHz is as the mixed frequency signal of direct frequency synthesizing.All output signals of phase-locked loop are orthogonal signalling.
The output signal of 6336MHz is at first carried out mixing with the 264MHz signal at first single sideband mixer 2, can obtain the orthogonal signalling that frequency is 6600MHz and 6072MHz, these 6600MHz orthogonal signalling are input to the input of MUX (MUX) 5 as one of four tunnel output signals.
The orthogonal signalling of the 6072MHz that above-mentioned optical mixing process obtains simultaneously, the orthogonal signalling of this 6072MHz and 528MHz signal carry out mixing at the 3rd single sideband mixer 4, can obtain the signal that frequency is 5544MHz, this signal is input to the input of MUX (MUX) 5 as one of four tunnel output signals.
6600MHz signal that aforementioned optical mixing process obtains and 528MHz signal carry out mixing at second single sideband mixer 3, can obtain the orthogonal signalling of 6072MHz and 7128MHz, and this two paths of signals is input to MUX as one of four tunnel output signals simultaneously.
MUX is controlled by external control signal.Because phase-locked loop frequency is set up, the frequency modulation speed between four tunnel output signals depends on the speed with MUX, has overcome phase-locked loop long shortcoming settling time thus, can realize fast frequency hopping.
This 5.5 to 7.2GHz four 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 5544MHz, 6072MHz, 6600MHz, four frequencies of 7128MHz, and the frequency hopping time between each frequency can be satisfied the fast frequency-hopped requirement of OFDM UWB communication system at nanosecond order.
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 (4)
1. 5.5 to 7.2GHz four 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 44MHz signal, include one 12 frequency divider in the based on feedback link successively, one 2 frequency divider and one 6 frequency divider, export stable 6336MHz orthogonal signalling to the first single sideband mixer (2), in scaling-down process, produce stable 528MHz orthogonal signalling and stable 264MHz orthogonal signalling, and these 528MHz orthogonal signalling are exported to second single sideband mixer (3) and the 3rd single sideband mixer (4) simultaneously, these 264MHz orthogonal signalling are exported to first single sideband mixer (2) simultaneously;
First single sideband mixer (2), the 6336MHz and the 264MHz orthogonal signalling that are used for being received from fixed frequency phase-locked loop (1) are carried out mixing, obtain 6600MHz orthogonal signalling and 6072MHz orthogonal signalling, the 6600MHz orthogonal signalling that obtain are exported to MUX (5) and second single sideband mixer (3) respectively, the 6072MHz orthogonal signalling that obtain are exported to the 3rd single sideband mixer (4);
Second single sideband mixer (3), the 528MHz orthogonal signalling that are used for will being received from the 6600MHz orthogonal signalling of first single sideband mixer (2) and being received from fixed frequency phase-locked loop (1) are carried out mixing, obtain 6072MHz and 7128MHz orthogonal signalling, and the 6072MHz and the 7128MHz orthogonal signalling that obtain are exported to MUX (5);
The 3rd single sideband mixer (4), the 528MHz orthogonal signalling that are used for will being received from the 6072MHz orthogonal signalling of first single sideband mixer (2) and being received from fixed frequency phase-locked loop (1) are carried out mixing, obtain the 5544MHz orthogonal signalling, and the 5544MHz orthogonal signalling that obtain are exported to MUX (5);
MUX (5), be used for the 6600MHz orthogonal signalling that are received from first single sideband mixer (2), the 6072MHz that is received from second single sideband mixer (3) and 7128MHz orthogonal signalling, and the 5544MHz orthogonal signalling that are received from the 3rd single sideband mixer (4) are selected output.
2. 5.5 to 7.2GHz four band frequency synthesizers that are used for the OFDM wireless ultra broadband according to claim 1 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.
3. 5.5 to 7.2GHz four 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 a MUX, the frequency hopping speed between each frequency depends on the switch speed of MUX.
4. 5.5 to 7.2GHz four band frequency synthesizers that are used for the OFDM wireless ultra broadband according to claim 1, it is characterized in that this frequency synthesizer adopts the mixed frequency signal of the direct frequency synthesis of fractional frequency signal conduct that obtains in the phase lock loop feedback loop road.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2007103038871A CN101471659B (en) | 2007-12-26 | 2007-12-26 | 5.5 to 7.2 GHz four-band frequency synthesizer for OFDM UWB |
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| CN2007103038871A CN101471659B (en) | 2007-12-26 | 2007-12-26 | 5.5 to 7.2 GHz four-band frequency synthesizer for OFDM UWB |
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| CN101471659B true CN101471659B (en) | 2010-09-29 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101867545B (en) * | 2010-05-31 | 2012-09-05 | 西安交通大学 | Frequency synthesizer of full-frequency range multi-band orthogonal frequency division multiplexing ultra-wideband radio frequency transceiver |
| CN106549656A (en) * | 2016-11-22 | 2017-03-29 | 章策珉 | A kind of frequency expands 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 |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1893293A (en) * | 2005-07-05 | 2007-01-10 | 三星电子株式会社 | Frequency synthesizer |
| US20070026816A1 (en) * | 2005-06-01 | 2007-02-01 | Wilinx, Inc. | High frequency synthesizer circuits and methods |
| US20070066262A1 (en) * | 2005-09-16 | 2007-03-22 | Chinmaya Mishra | Frequency synthesizer architecture for multi-band ultra-wideband system |
| CN101079628A (en) * | 2005-11-04 | 2007-11-28 | 威盛电子股份有限公司 | Frequency synthesizer and signal forming method |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070026816A1 (en) * | 2005-06-01 | 2007-02-01 | Wilinx, Inc. | High frequency synthesizer circuits and methods |
| CN1893293A (en) * | 2005-07-05 | 2007-01-10 | 三星电子株式会社 | Frequency synthesizer |
| US20070066262A1 (en) * | 2005-09-16 | 2007-03-22 | Chinmaya Mishra | Frequency synthesizer architecture for multi-band ultra-wideband system |
| CN101079628A (en) * | 2005-11-04 | 2007-11-28 | 威盛电子股份有限公司 | Frequency synthesizer and signal forming method |
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