CN102104571A - Ultra-wideband frequency synthesizer for 6-9 GHz dual carrier orthogonal frequency division multiplexing (OFDM) - Google Patents
Ultra-wideband frequency synthesizer for 6-9 GHz dual carrier orthogonal frequency division multiplexing (OFDM) Download PDFInfo
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- CN102104571A CN102104571A CN2009102427621A CN200910242762A CN102104571A CN 102104571 A CN102104571 A CN 102104571A CN 2009102427621 A CN2009102427621 A CN 2009102427621A CN 200910242762 A CN200910242762 A CN 200910242762A CN 102104571 A CN102104571 A CN 102104571A
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Abstract
The invention discloses an ultra-wideband frequency synthesizer for 6-9 GHz dual carrier orthogonal frequency division multiplexing (OFDM), comprising a phase-locked loop with a fixed frequency, a first multiple selector, a second multiple selector, a first single-sideband frequency mixer, a second single-sideband frequency mixer, a third single-sideband frequency mixer, a fourth single-sideband frequency mixer and two dimidiate frequency divider which generate eight pairs of carrier components and a quadrature carrier component for 6-9 GHz dual carrier OFDM ultra-wideband communication. By the ultra-wideband frequency synthesizer disclosed by the invention, the frequency and frequency-hopping speed of the frequency synthesizer are improved, and the requirements of DC-OFDM UWB (direct current-orthogonal frequency division multiplexing ultra-wide bandwidth) communication systems are satisfied. In addition, the frequency synthesizer can be used in a dual carrier OFDM ultra-wideband transceiver of secondary frequency conversion zero intermediate frequency. The frequency synthesizer provided by the invention has the characteristics of simple structure, small area and low power consumption; the frequency synthesizer comprises only one phase-locked loop (the traction effect of a plurality of phase-locked loops is avoided), and the obtained frequency is more stable.
Description
Technical field
The present invention relates to the broadband RF communication technical field, particularly a kind of ultra wide band frequency synthesizer that is used for 6 to 9GHz two carrier wave OFDMs.
Background technology
Ultra broadband (Ultra-Wide band, 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.
(Multi-Band Orthogonal Frequency DivisionMultiplexing, MB-OFDM) scheme is one of main implementation of present high speed ultra-wideband communications to Mb-ofdm.The MB-OFDM standard code, ofdm signal is become by 128 sub carrier group, these carrier occupancies 528MHz, available band is divided into some 528MHz sub-bands.By modulated carrier, one that in turn the base band ultra-broadband signal is moved in the above-mentioned sub-band sends.
The sub-band bandwidth of MB-OFDM UWB scheme is greater than 500MHz, and frequency spectrum uses dumb, and spectrum utilization efficiency is not high, realizes requiring high to hardware.Another kind of realization mechanism is two carrier wave OFDM (Dual-Carrier Orthogonal Frequency Division Multiplexing, DC-OFDM) super broad band radio communications.In the DC-OFDM method, the width of sub-band is 264MHz, uses the sub-band of two separation wherein to transmit the baseband OFDM signal when communication.
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, it need be when keeping spectral purity, can jump to another carrier wave from a carrier wave in the time in nanosecond, 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 transceiver.
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 still find no report on DC-OFDM UWB frequency synthesizer is realized, in particular for rare especially the mentioning of frequency synthesizer in the DC-OFDM UWB double conversion zero intermediate frequency transceiver.
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 ultra wide band frequency synthesizer that is used for 6 to 9GHz two carrier wave OFDMs, and the while accomplishes more excellent on area and power consumption, satisfies the requirement of UWB communication system.
(2) technical scheme
For achieving the above object, the invention provides a kind of ultra wide band frequency synthesizer that is used for 6 to 9GHz two carrier wave OFDMs, this frequency synthesizer comprises that the phase-locked loop, first MUX, second MUX, first single sideband mixer, second single sideband mixer, the 3rd single sideband mixer, the 4th single sideband mixer of fixed frequency and two remove two-divider, produce eight pairs of carrier components and a quadrature carrier components of being used for 6 to 9GHz two carrier wave OFDM ultra-widebands communications.
In the such scheme, this frequency synthesizer adopts direct frequency synthesis technique, in single sideband mixer, carry out the frequency operation that adds deduct by the frequency of frequency that phase-locked loop is produced and MUX output, export 7656 and 8184MHz, 7920 and 8448MHz, 8712 and 9240MHz, 8976 and 9504MHz, 7656 and 8712MHz, 7920 and 8976MHz, 8184 and 9240MHz, 8448 and eight pairs of carrier signals of 9504MHz and a 1320MHz quadrature carrier signal.
In the such scheme, this frequency synthesizer comprises:
The phase-locked loop of fixed frequency, this phase-locked loop is a reference frequency signal with the 66MHz signal, includes seven in the based on feedback link successively and removes two-divider, exports stable 8448MHz orthogonal signalling to the three single sideband mixers and the 4th single sideband mixer;
First MUX is used to receive 1056,792,528,264MHz signal and DC component, and by the control of external signal select 1056,792,528, a road in 264MHz signal and the DC component export to the 3rd single sideband mixer;
Second MUX is used to receive 1056,792,528,264MHz signal and DC component, and by the control of external signal select 1056,792,528, a road in 264MHz signal and the DC component export to the 4th single sideband mixer;
First single sideband mixer and one remove two-divider, are used for the 1056MHz orthogonal signalling that receive are carried out frequency domain add operation mutually with the 528MHz orthogonal signalling, and output signal be again through removing two-divider, produce the 792MHz orthogonal signalling and export;
Second single sideband mixer and one remove two-divider, are used for the 2112MHz orthogonal signalling that receive are carried out frequency domain add operation mutually with the 528MHz orthogonal signalling, and output signal be again through removing two-divider, produce the 1320MHz orthogonal signalling and export, and promptly export f
0
The 3rd single sideband mixer and the 4th single sideband mixer, be used for being received from first MUX and second MUX 1056,792,528,264MHz and DC with carry out frequency domain addition or reducing mutually from the 8448MHz orthogonal signalling of phase-locked loop, obtain 7656 and 8184MHz, 7920 and 8448MHz, 8712 and 9240MHz, 8976 and 9504MHz, 7656 and 8712MHz, 7920 and 8976MHz, 8184 and 9240MHz, 8448 and eight pairs of carrier signals of eight pairs of carrier signals of 9504MHz and output, promptly export f
1And f
2
In the such scheme, described phase-locked loop adopts the orthogonal voltage-controlled vibrator that directly produces the I/Q two paths of signals, avoids adopting doubled frequency VCO to produce the method for orthogonal signalling then by two divided-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 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, this frequency synthesizer that is used for 6 to 9GHz two carrier wave OFDM ultra-widebands provided by the invention, adopt a phase-locked loop, four single sideband mixers, two MUX and two to remove the UWB carrier signal that two-divider produces eight pairs 6 to 9GHz, improve the frequency and the frequency hopping speed of frequency synthesizer, satisfied the requirement of DC-OFDM UWB communication system.
2, this frequency synthesizer that is used for 6 to 9GHz two carrier wave OFDM ultra-widebands provided by the invention has only been used a phase-locked loop, has promptly avoided the traction effectiveness of a plurality of phase-locked loops, has improved frequency stability, has reduced design complexities and difficulty again.
3, this frequency synthesizer that is used for 6 to 9GHz two carrier wave OFDM ultra-widebands 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 switch like this, can realize the frequency hopping speed of nanosecond fully, satisfy the requirement of UWB communication system.
4, this frequency synthesizer that is used for 6 to 9GHz two carrier wave OFDM ultra-widebands provided by the invention, phase-locked loop has adopted the quadrature VCO of direct generation I/Q 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, this frequency synthesizer that is used for 6 to 9GHz two carrier wave OFDM ultra-widebands provided by the invention, the high-band frequency that produces need not orthogonal signalling, orthogonal signalling output only is provided at low-frequency range frequency place, thereby avoided the phase place of orthogonal signalling and the problem that amplitude characteristic is interfered easily, reduced design difficulty.
Description of drawings
Fig. 1 is the distribution diagram that is used for the carrier frequency of 6 to 9GHz DC-OFDM UWB provided by the invention.
Fig. 2 is the structured flowchart that is used for the frequency synthesizer of 6 to 9GHz DC-OFDM UWB provided by the invention.
Fig. 3 is the frequency relation application drawing that is used for the frequency synthesizer of 6 to 9GHz DC-OFDM 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.
The ultra wide band frequency synthesizer that is used for 6 to 9GHz two carrier wave OFDMs provided by the invention, comprise that the phase-locked loop, first MUX, second MUX, first single sideband mixer, second single sideband mixer, the 3rd single sideband mixer, the 4th single sideband mixer of fixed frequency and two remove two-divider, produce eight pairs of carrier components and a quadrature carrier components of being used for 6 to 9GHz two carrier wave OFDM ultra-widebands communications.This frequency synthesizer adopts direct frequency synthesis technique, in single sideband mixer, carry out the frequency operation that adds deduct by the frequency of frequency that phase-locked loop is produced and MUX output, export 7656 and 8184MHz, 7920 and 8448MHz, 8712 and 9240MHz, 8976 and 9504MHz, 7656 and 8712MHz, 7920 and 8976MHz, 8184 and 9240MHz, 8448 and eight pairs of carrier signals of 9504MHz and a 1320MHz quadrature carrier signal.
Shown in Figure 1 is the distribution diagram that is used for the carrier frequency of 6 to 9GHz DC-OFDM UWB provided by the invention.As we can see from the figure, 6204MHz to 8316MHz frequency range is divided into the sub-band of eight 264MHz width, and the centre frequency of this eight sub-frequency bands correspondence is (6336,6600,6864,7128,7392,7656,7920,8184) (MHz of unit).In order to obtain above-mentioned centre frequency, it is that 1320MHz (is f that the present invention selects a lower carrier frequency especially
0), thereby needing to produce eight frequencies of (7656,7920,8184,8448,8712,8976,9240,9504) (MHz of unit), corresponding simultaneously image signal drops on 8976MHz to 10824MHz.
Shown in Figure 2 is the structured flowchart that is used for the ultra wide band frequency synthesizer of 6 to 9GHz two carrier wave OFDMs provided by the invention, and this frequency synthesizer comprises that phase-locked loop, first MUX, second MUX, first single sideband mixer, second single sideband mixer, the 3rd single sideband mixer, the 4th single sideband mixer and two remove two-divider.
Wherein, the fixed frequency phase-locked loop is a reference frequency signal with the 66MHz signal, includes seven in the based on feedback link successively and removes two-divider, exports stable 8448MHz orthogonal signalling to the three single sideband mixers and the 4th single sideband mixer.
First MUX is used to receive 1056,792,528,264MHz and DC component (DC), and by external signal control select 1056,792,528, a road in 264MHz and the DC component export to the 3rd single sideband mixer;
Second MUX is used to receive 1056,792,528,264MHz and DC component (DC), and by external signal control select 1056,792,528, a road in 264MHz and the DC component export to the 4th single sideband mixer;
First single sideband mixer and one remove two-divider, and 1056MHz quadrature (I/Q) signal that is used for receiving carries out frequency domain add operation mutually with the 528MHz orthogonal signalling, and output signal is again through removing two-divider, produce the 792MHz orthogonal signalling and export;
Second single sideband mixer and one remove two-divider, and 2112MHz quadrature (I/Q) signal that is used for receiving carries out frequency domain add operation mutually with the 528MHz orthogonal signalling, and output signal is again through removing two-divider, produce the 1320MHz orthogonal signalling and export, and promptly export f
0
The 3rd single sideband mixer and the 4th single sideband mixer, be used for being received from first MUX and second MUX 1056,792,528,264MHz and DC with carry out frequency domain addition or reducing mutually from the 8448MHz orthogonal signalling of phase-locked loop, obtain 7656 and 8184MHz, 7920 and 8448MHz, 8712 and 9240MHz, 8976 and 9504MHz, 7656 and 8712MHz, 7920 and 8976MHz, 8184 and 9240MHz, 8448 and eight pairs of carrier signals of eight pairs of carrier signals of 9504MHz and output, promptly export f
1And f
2
The ultra wide band frequency synthesizer that is used for 6 to 9GHz two carrier wave OFDMs provided by the invention, produce 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 speed of switch, has realized the frequency hopping speed of nanosecond.Phase-locked loop adopts the orthogonal voltage-controlled vibrator (QVCO) that directly produces the I/Q 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, has reduced hardware and has realized difficulty.In addition, described frequency synthesizer only comprises that a phase-locked loop just can produce required eight pairs of carrier signals and a quadrature carrier signal, and the pulling effect of having avoided a plurality of phase-locked loops to cause has easily guaranteed the stability of hardware to have reduced design difficulty.
Refer again to Fig. 2, this frequency synthesizer has comprised following circuit module: 8448MHz integer P LL, two MUX, four single sideband mixers and two remove two-divider.
To provide concrete frequency synthesis scheme below:
What the PLL of 8448MHz adopted is the crystal oscillator frequency of 66MHz, frequency dividing ratio is 2 * 2 * 2 * 2 * 2 * 2 * 2, finally produced the output of 66M * 2 * 2 * 2 * 2 * 2 * 2 * 2=8448MHz, the VCO of this phase-locked loop adopts the QVCO that can directly produce the I/Q two paths of signals.The orthogonal signalling of 264MHz, 528MHz, 1056MHz and 2112MHz in the scaling-down process of this phase-locked loop, have been produced.
The 1056MHz orthogonal signalling and the 528MHz orthogonal signalling that produce among the above-mentioned PLL are passed to first single sideband mixer, produce the component 1056MHz+528MHz of frequency domain addition, be passed to next stage again and remove two-divider, generate (1056MHz+528MHz)/2=792MHz orthogonal signalling.
The 2112MHz orthogonal signalling and the 528MHz orthogonal signalling that produce among the above-mentioned PLL are passed to second single sideband mixer, produce the component 2112MHz+528MHz of frequency domain addition, be passed to next stage again and remove two-divider, generate (2112MHz+528MHz)/2=1320MHz orthogonal signalling, i.e. carrier frequency f
0
The 1056MHz that produces in the foregoing description, 792MHz, 528MHz, 264MHz orthogonal signalling are passed to first MUX and second MUX with DC; By the control of external signal, synchronization is realized needed frequency output to above-mentioned two MUX respectively; The frequency component of output adds reducing by frequency domain with the 8448MHz orthogonal signalling and obtains 7656 and 8184MHz, 7920 and 8448MHz, 8712 and 9240MHz, 8976 and 9504MHz, 7656 and 8712MHz, 7920 and 8976MHz, 8184 and 9240MHz, 8448 and 9504MHz eight couples of carrier frequencies, i.e. (f in the 3rd single sideband mixer and the 4th single sideband mixer
1, f
2).Concrete frequencies operations relation sees also Fig. 3.
This ultra wide band frequency synthesizer that is used for 6 to 9GHz two carrier wave OFDMs provided by the invention, by adopting direct frequency synthesis technique, can export 7656 and 8184MHz, 7920 and 8448MHz, 8712 and 9240MHz, 8976 and 9504MHz, 7656 and 8712MHz, 7920 and 8976MHz, 8184 and 9240MHz, 8448 and eight pairs of carrier frequencies of 9504MHz and an orthogonal carrier frequencies, and the frequency hopping time between each frequency can be satisfied the fast frequency-hopped requirement of DC-OFDM UWB communication system at nanosecond order.
In addition, this frequency synthesizer has been exported an I/Q local oscillation signal and eight pairs of non-I/Q carrier signals, can be applied in the DC-OFDMUWB transceiver of double conversion zero intermediate frequency.
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. ultra wide band frequency synthesizer that is used for 6 to 9GHz two carrier wave OFDMs, it is characterized in that, this frequency synthesizer comprises that the phase-locked loop, first MUX, second MUX, first single sideband mixer, second single sideband mixer, the 3rd single sideband mixer, the 4th single sideband mixer of fixed frequency and two remove two-divider, produce eight pairs of carrier components and a quadrature carrier components of being used for 6 to 9GHz two carrier wave OFDM ultra-widebands communications.
2. the ultra wide band frequency synthesizer that is used for 6 to 9GHz two carrier wave OFDMs according to claim 1, it is characterized in that, this frequency synthesizer adopts direct frequency synthesis technique, in single sideband mixer, carry out the frequency operation that adds deduct by the frequency of frequency that phase-locked loop is produced and MUX output, export 7656 and 8184MHz, 7920 and 8448MHz, 8712 and 9240MHz, 8976 and 9504MHz, 7656 and 8712MHz, 7920 and 8976MHz, 8184 and 9240MHz, 8448 and eight pairs of carrier signals of 9504MHz and a 1320MHz quadrature carrier signal.
3. the ultra wide band frequency synthesizer that is used for 6 to 9GHz two carrier wave OFDMs according to claim 1 is characterized in that this frequency synthesizer comprises:
The phase-locked loop of fixed frequency, this phase-locked loop is a reference frequency signal with the 66MHz signal, includes seven in the based on feedback link successively and removes two-divider, exports stable 8448MHz orthogonal signalling to the three single sideband mixers and the 4th single sideband mixer;
First MUX is used to receive 1056,792,528,264MHz signal and DC component, and by the control of external signal select 1056,792,528, a road in 264MHz signal and the DC component export to the 3rd single sideband mixer;
Second MUX is used to receive 1056,792,528,264MHz signal and DC component, and by the control of external signal select 1056,792,528, a road in 264MHz signal and the DC component export to the 4th single sideband mixer;
First single sideband mixer and one remove two-divider, are used for the 1056MHz orthogonal signalling that receive are carried out frequency domain add operation mutually with the 528MHz orthogonal signalling, and output signal be again through removing two-divider, produce the 792MHz orthogonal signalling and export;
Second single sideband mixer and one remove two-divider, are used for the 2112MHz orthogonal signalling that receive are carried out frequency domain add operation mutually with the 528MHz orthogonal signalling, and output signal be again through removing two-divider, produce the 1320MHz orthogonal signalling and export, and promptly export f
0
The 3rd single sideband mixer and the 4th single sideband mixer, be used for being received from first MUX and second MUX 1056,792,528,264MHz and DC with carry out frequency domain addition or reducing mutually from the 8448MHz orthogonal signalling of phase-locked loop, obtain 7656 and 8184MHz, 7920 and 8448MHz, 8712 and 9240MHz, 8976 and 9504MHz, 7656 and 8712MHz, 7920 and 8976MHz, 8184 and 9240MHz, 8448 and eight pairs of carrier signals of eight pairs of carrier signals of 9504MHz and output, promptly export f
1And f
2
4. according to claim 1 or the 3 described ultra wide band frequency synthesizers that are used for 6 to 9GHz two carrier wave OFDMs, it is characterized in that, described phase-locked loop adopts the orthogonal voltage-controlled vibrator that directly produces the I/Q two paths of signals, avoids adopting doubled frequency VCO to produce the method for orthogonal signalling then by two divided-frequency.
5. according to claim 1 or the 3 described ultra wide band frequency synthesizers that are used for 6 to 9GHz two carrier wave OFDMs, 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 speed of switch, realizes the frequency hopping speed of nanosecond.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102355260A (en) * | 2011-08-09 | 2012-02-15 | 东南大学 | Current-reuse frequency-halving circuit |
| CN103905087A (en) * | 2012-12-24 | 2014-07-02 | 中国电子科技集团公司第五十研究所 | Broadband frequency-hopping radio frequency receiving system |
| CN111313928A (en) * | 2020-02-13 | 2020-06-19 | 广州全盛威信息技术有限公司 | Ultra-wideband transceiver architecture supporting multiple systems and corresponding wireless access control device |
| 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 |
| CN111585609A (en) * | 2020-03-25 | 2020-08-25 | 北京理工大学 | Miniaturized zero intermediate frequency fast frequency hopping radio station |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101547008A (en) * | 2009-04-30 | 2009-09-30 | 复旦大学 | Frequency synthesizer covering ultra wideband 4 to 5GHz and 6 to 9GHz frequency points |
-
2009
- 2009-12-16 CN CN2009102427621A patent/CN102104571A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101547008A (en) * | 2009-04-30 | 2009-09-30 | 复旦大学 | Frequency synthesizer covering ultra wideband 4 to 5GHz and 6 to 9GHz frequency points |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102355260A (en) * | 2011-08-09 | 2012-02-15 | 东南大学 | Current-reuse frequency-halving circuit |
| CN102355260B (en) * | 2011-08-09 | 2013-10-30 | 东南大学 | Current-reuse frequency-halving circuit |
| CN103905087A (en) * | 2012-12-24 | 2014-07-02 | 中国电子科技集团公司第五十研究所 | Broadband frequency-hopping radio frequency receiving system |
| CN103905087B (en) * | 2012-12-24 | 2016-05-04 | 中国电子科技集团公司第五十研究所 | Wide interval frequency hopping radio-frequency receiving system |
| CN111313928A (en) * | 2020-02-13 | 2020-06-19 | 广州全盛威信息技术有限公司 | Ultra-wideband transceiver architecture supporting multiple systems and corresponding wireless access control device |
| CN111313928B (en) * | 2020-02-13 | 2021-12-28 | 广州全盛威信息技术有限公司 | Ultra-wideband transceiver architecture supporting multiple systems and corresponding wireless access control device |
| CN111585609A (en) * | 2020-03-25 | 2020-08-25 | 北京理工大学 | Miniaturized zero intermediate frequency fast frequency hopping radio station |
| 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 |
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Application publication date: 20110622 |