CN104579329A - Crystal oscillator frequency synthesizer - Google Patents
Crystal oscillator frequency synthesizer Download PDFInfo
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- CN104579329A CN104579329A CN201410730106.7A CN201410730106A CN104579329A CN 104579329 A CN104579329 A CN 104579329A CN 201410730106 A CN201410730106 A CN 201410730106A CN 104579329 A CN104579329 A CN 104579329A
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- 238000004891 communication Methods 0.000 claims abstract description 3
- 230000010355 oscillation Effects 0.000 claims description 3
- 230000009514 concussion Effects 0.000 claims 1
- 238000006243 chemical reaction Methods 0.000 abstract description 3
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Abstract
The invention relates to a frequency synthesizer for wireless communication of a Q frequency band and a 60GHz frequency band, which adopts a structure based on an integer frequency division phase-locked loop and takes a 40MHz crystal oscillator as a reference frequency. The feedback loop comprises: divide-by-9 frequency dividers, divide-by-2 or 3 multi-modulus frequency dividers, divide-by-111/112/113/115/116/117/163/164/165/167/168/169/171/172/173 multi-modulus frequency dividers, one x 3 frequency multiplier and one x 4 frequency multiplier. By selecting the division ratio of the two multi-modulus dividers and the multiplication ratio of the frequency multiplier, the following Q-band local oscillator frequencies for the direct conversion architecture can be generated: 44.01GHz, 44.28GHz, 44.55GHz, 45.09GHz, 45.36GHz, 45.63GHz, 46.17GHz, 46.44GHz, 46.71 GHz; and a local oscillator frequency in the 60GHz band for the direct conversion structure: 59.94GHz, 60.48GHz, 61.02GHz, 62.1GHz, 62.64GHz and 63.18 GHz.
Description
Technical field
The present invention relates to the Q frequency range and 60GHz band frequency synthesizer that are applied to Wireless Personal Network WPAN (Wireless Personal AreaNetwork), is the Important Circuit module in compatible Q frequency range and 60GHz band radio transceiver.
Background technology
Millimeter wave radio communication is comparatively large due to its bandwidth, thus can realize the transmission rate up to G bps magnitude, maybe will become the mainstream technology of ultrahigh speed Wireless Personal Network.
At present, numerous country and region in succession mark off near 60GHz 5 ~ 9GHz exempt from permit Continuous Band, China has also opened 59 ~ 64GHz frequency band in 2006.In the world, the standards such as ECMA-387, WirelessHD 1.0, IEEE 802.15.3c, IEEE 802.11ad have been worked up.In the industry cycle, the consumer electronics manufacturers such as NEC, Samsung, Panasonic and LG have set up WirelessHD alliance jointly to promote the application of millimeter-wave technology in transmitting without compression HD video, its huge market potential as seen.And in academia, ISSCC (International Solid State Circuits Conference) is offered special topic every year and is collected the relevant paper of millimeter-wave technology, and all many-sided researchs such as millimetre-wave circuit design, test are subject to extensive concern.
Q frequency range is with its loss lower than 60GHz frequency range, and under identical performance, power consumption is about 80% of 60GHz system, and becomes the frequency range that another has application potential.
Summary of the invention
Based on above background, propose a kind of can the frequency synthesizer of compatible Q frequency range and 60GHz frequency range, this frequency synthesizer is applicable to Q frequency range and the planning of 60GHz frequency spectrum of China, may be used for the transceiver of Direct Conversion structure.
The advantage of the frequency synthesizer that the present invention sets forth is: have employed conventional 40MHz crystal oscillator; With the phase-locked loop of integral frequency divisioil structure; Use frequency multiplication structure to make VCO be operated in relatively low frequency, what reduce VCO realizes difficulty; Compatible two frequency bands.
Accompanying drawing explanation
Fig. 1 is the system block diagram of the Q frequency range that proposes of the present invention and 60GHz band Frequency Synthesizers.
Embodiment
The invention provides the embodiment of a 40MHz crystal oscillator frequency synthesizer, this frequency synthesizer comprises input circuit, phase-locked loop and output circuit.Wherein,
Input loop comprises: 40MHz crystal oscillator 111, except 8 frequency dividers 101, phase frequency detector 102, charge pump 103, low pass filter 104 and voltage controlled oscillator 105;
Phase-locked loop comprises: except 2 or except 3 multi-modulus frequency dividers 109, except 111/112/113/115/116/117/163/164/165/167/168/169/171/172/ 173 multi-modulus frequency dividers 110 and except 8 frequency dividers 108, wherein multi-modulus frequency divider 110 is made up of 2 or 3 multi-modulus frequency dividers that remove of 8 grades of cascades;
Output loop comprises: × 3 frequency multiplier 106 and × 4 frequency multipliers 107.
The specific embodiments of this frequency synthesizer is as follows:
Voltage controlled oscillator (VCO) produces the frequency of oscillation of 14.7 ~ 15.8GHz.When needing the frequency exporting Q frequency range, select × 3 frequency multipliers, control word P
s2=0; When needing the frequency exporting 60GHz frequency range, select × 4 frequency multipliers, control word P
s2=1.In feedback control loop, first the output frequency of VCO is removed 9 frequency divisions.Afterwards, when needing the frequency exporting Q frequency range, select except 2 patterns, control word P
s1=0; When needing the frequency exporting 60GHz frequency range, select except 3 patterns, control word P
s1=1.The frequency dividing ratio of cascade multi-modulus frequency divider is by 2
7p
7+ 2
6p
6+ 2
5p
5+ 2
4p
4+ 2
3p
3+ 2
2p
2+ 2P
1+ P
0determine, by changing P
0-P
7low and high level can realize between 1-256 all integral frequency divisioils.The control word of the cascade multi-modulus frequency divider frequency dividing ratio of each frequency lists in table 1.Feedback frequency after frequency division and 40MHz crystal oscillator frequency are except the 5MHz frequency produced after 8 frequency divisions is as the input of PFD.
As can be seen here by the frequency dividing ratio of selection two multi-modulus frequency dividers, and times frequency ratio of frequency multiplier, six local frequencies of 60GHz can be produced: 59.94GHz, 60.48GHz, 61.02GHz, 62.1GHz, 62.64GHz, 63.18GHz; And nine of Q frequency range local frequencies: 44.01GHz, 44.28GHz, 44.55GHz, 45.09GHz, 45.36GHz, 45.63GHz, 46.17GHz, 46.44GHz, 46.71GHz.
Claims (5)
1., for a frequency synthesizer for Q frequency range and 60GHz multiband wireless communications, comprise input circuit, feedback control loop and output circuit, wherein,
Input circuit comprises: 40MHz crystal oscillator (111), except 8 frequency divisions (101), phase frequency detector (102), charge pump (103), low pass filter (104) and voltage controlled oscillator (105);
Feedback control loop comprises: except 9 frequency dividers (108), except 2 or except 3 multi-modulus frequency dividers (109) and except 111/112/113/115/116/117/163/164/165/167/168/169/171/172/ 173 multi-modulus frequency dividers (110);
Output circuit comprises: × 3 frequency multipliers (106) and × 4 frequency multipliers (107).
2. frequency synthesizer according to claim 1, is characterized in that, described voltage controlled oscillator (105) can produce the concussion that frequency is 14.7 ~ 15.8GHz.
3. frequency synthesizer according to claim 1, is characterized in that, by changing the frequency dividing ratio control word P except 2 or 3 multi-modulus frequency dividers (109)
s1, except the control word P of 111/112/113/115/116/117/163/164/165/167/168/169/171/172/ 173 multi-modulus frequency dividers (110)
7p
6p
5p
4p
3p
2p
1p
0, and times frequency ratio control word P of × 3 frequency multipliers 106 and × 4 frequency multipliers (107)
s2, the following local oscillation signal for Q frequency range can be produced: 44.01GHz, 44.28GHz, 44.55GHz, 45.09GHz, 45.36GHz, 45.63GHz, 46.17GHz, 46.44GHz, 46.71GHz; And for the local oscillation signal of 60GHz: 59.94GHz, 60.48GHz, 61.02GHz, 62.1GHz, 62.64GHz, 63.18GHz.
4. the frequency synthesizer according to claim 1,3, it is characterized in that, described 111/112/113/115/116/117/163/164/165/167/168/169/171/172/ 173 multi-modulus frequency dividers (110) that remove are made up of 2 or 3 multi-modulus frequency dividers that remove of 8 grades of cascades, and frequency dividing ratio is by 2
7p
7+ 2
6p
6+ 2
5p
5+ 2
4p
4+ 2
3p
3+ 2
2p
2+ 2P
1+ P
0determine, thus all integral frequency divisioils between 1 ~ 256 can be produced.
5. frequency synthesizer according to claim 1, is characterized in that, the oscillator signal process that the crystal oscillator (111) of described 40MHz produces removes the signal that 8 frequency divisions obtain 5MHz, compares with feedback signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410730106.7A CN104579329A (en) | 2014-12-04 | 2014-12-04 | Crystal oscillator frequency synthesizer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410730106.7A CN104579329A (en) | 2014-12-04 | 2014-12-04 | Crystal oscillator frequency synthesizer |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105553495A (en) * | 2015-12-18 | 2016-05-04 | 中国电子科技集团公司第四十一研究所 | Method for receiving frequency band signal above 20GHz in spread spectrum manner through millimeter wave receiver |
| CN109756225A (en) * | 2018-12-27 | 2019-05-14 | 复旦大学 | A kind of frequency synthesizer applied to multi-mode millimetre-wave attenuator |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102611444A (en) * | 2011-01-24 | 2012-07-25 | 中国科学院微电子研究所 | Direct-conversion structure 40MHz crystal oscillator frequency synthesizer for 60GHz wireless communication |
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2014
- 2014-12-04 CN CN201410730106.7A patent/CN104579329A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102611444A (en) * | 2011-01-24 | 2012-07-25 | 中国科学院微电子研究所 | Direct-conversion structure 40MHz crystal oscillator frequency synthesizer for 60GHz wireless communication |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105553495A (en) * | 2015-12-18 | 2016-05-04 | 中国电子科技集团公司第四十一研究所 | Method for receiving frequency band signal above 20GHz in spread spectrum manner through millimeter wave receiver |
| CN109756225A (en) * | 2018-12-27 | 2019-05-14 | 复旦大学 | A kind of frequency synthesizer applied to multi-mode millimetre-wave attenuator |
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Application publication date: 20150429 |