CN102891680A - Direct frequency synthesizer - Google Patents
Direct frequency synthesizer Download PDFInfo
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- CN102891680A CN102891680A CN2011102122809A CN201110212280A CN102891680A CN 102891680 A CN102891680 A CN 102891680A CN 2011102122809 A CN2011102122809 A CN 2011102122809A CN 201110212280 A CN201110212280 A CN 201110212280A CN 102891680 A CN102891680 A CN 102891680A
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- electrically connected
- adder
- coefficient
- direct synthesizer
- complement unit
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Abstract
The invention discloses a direct frequency synthesizer which comprises a phase accumulator and a phase amplitude converter; the phase amplitude converter is provided with a first complementing unit, a first summing device electrically connected with the first complementing unit, a second coefficient unit electrically connected with the first complementing unit and the first summing device, a squarer electrically connected with the first summing device, a first coefficient electrically connected with the first complementing unit and the squarer, a third coefficient unit electrically connected with the first complementing unit, a second summing device electrically connected with the first coefficient unit and the third coefficient unit, and a second complementing unit electrically connected with the second summing device.
Description
Technical field
The present invention relates to a kind of direct synthesizer, particularly relate to a kind of direct synthesizer that can effectively promote frequency spectrum resolution and arithmetic speed.
Background technology
Existing known direct synthesizer 200, see also shown in Figure 4, this direct synthesizer 200 comprises a phase accumulator 210, one read only memory 220 and that is electrically connected this phase accumulator 210 is electrically connected the digital analog converter 230 of this read only memory 220, wherein this phase accumulator 210 can receive a phase-accumulated unit, this read only memory 220 has a memory 221, one digital operation unit 222 and an output stage 223, this direct synthesizer 200 is the modes of tabling look-up, to obtain the string wave number that is stored in this read only memory 220, only, this direct synthesizer 200 comprises this read only memory 220, therefore circuit area still can't effectively dwindle, in addition, the mode of look-up table is incited somebody to action so that the arithmetic speed of this direct synthesizer 200 declines to a great extent.
This shows that above-mentioned existing direct synthesizer obviously still has inconvenience and defective, and demands urgently further being improved in structure and use.In order to solve the problem of above-mentioned existence, relevant manufacturer there's no one who doesn't or isn't seeks solution painstakingly, finished by development but have no for a long time applicable design always, and common product does not have appropriate structure to address the above problem, this obviously is the problem that the anxious wish of relevant dealer solves.Therefore how to found a kind of novel direct synthesizer, real one of the current important research and development problem that belongs to, also becoming the current industry utmost point needs improved target.
Summary of the invention
The object of the invention is to, a kind of novel direct synthesizer is provided, by those coefficient elements, this first adder, this second adder and this squarer, and utilize approximatioss in the mathematical equation, ask for into the output like desirable string ripple, because the string ripple that the present invention simulates and the error of desirable string ripple can effectively reduce, therefore the present invention has the characteristic of high spectrum purity, in addition, when the present invention is applied to protein frequency displacement detecting, because direct synthesizer has high spectrum purity, therefore can guarantee that centre frequency has the highest peak value judged in the scope of frequency sweep, in addition, the present invention need not be via tabling look-up, therefore effective improving operational speed.
The object of the invention to solve the technical problems realizes by the following technical solutions.According to a kind of direct synthesizer that the present invention proposes, it comprises: a phase accumulator; And a phase amplitude transducer, it is electrically connected this phase accumulator, and this phase amplitude transducer has: one first complement unit; One first adder, it is electrically connected this first complement unit; One second coefficient elements, it is electrically connected this first complement unit and this first adder; One squarer, it is electrically connected this first adder; One first coefficient elements, it is electrically connected this first complement unit and this squarer; One the 3rd coefficient elements, it is electrically connected this first complement unit; One second adder, it is electrically connected this first coefficient elements and the 3rd coefficient elements; And one second complement unit, it is electrically connected this second adder.
The object of the invention to solve the technical problems also can be applied to the following technical measures to achieve further.
Aforesaid direct synthesizer, wherein said phase accumulator have the buffer that one the 3rd adder and is electrically connected the 3rd adder.
Aforesaid direct synthesizer, wherein said the first complement unit is electrically connected this phase accumulator.
Aforesaid direct synthesizer, wherein said the first coefficient elements has a plurality of selectors, a plurality of the first shift registor and a plurality of the first multiplexer, respectively this selector is electrically connected respectively this first shift registor, respectively this first shift registor is electrically connected respectively this first multiplexer, described selector is electrically connected this squarer, and described the first multiplexer is electrically connected this first complement unit and this second adder.
Aforesaid direct synthesizer, wherein said the second coefficient elements have the second multiplexer that one second shift registor and is electrically connected this second shift registor, and this second multiplexer is electrically connected this first complement unit and this first adder.
Aforesaid direct synthesizer, wherein said the 3rd coefficient elements have the 3rd multiplexer that one the 3rd shift registor and is electrically connected the 3rd shift registor, and the 3rd multiplexer is electrically connected this first complement unit and this second adder.
Aforesaid direct synthesizer, it has one the 4th adder in addition, and the 4th adder is electrically connected this second complement unit.
Aforesaid direct synthesizer, it has a Quaternary system counting unit in addition, and this Quaternary system counting unit is electrically connected the 4th adder.
Aforesaid direct synthesizer, wherein said the second complement unit are electrically connected this phase accumulator and this first complement unit.
Aforesaid direct synthesizer, it has a kind of non-parabola sampling method of dividing equally of second order that is applied to this direct synthesizer in addition, and the equation of this sampling method is y=a
i* (x+b
i)
2+ c
i(1≤i≤M), wherein a
iBe the first coefficient, b
iBe the second coefficient, c
iBe that the 3rd coefficient, x are that input signal, M are that line of cut hop count, the i of 1/4th string ripples is the non-section of dividing equally.
The present invention compared with prior art has obvious advantage and beneficial effect.By technique scheme, direct synthesizer of the present invention has following advantages and beneficial effect at least: the present invention is by those coefficient elements, this first adder, this second adder and this squarer, and utilize approximatioss in the mathematical equation, ask for into the output like desirable string ripple, because the string ripple that the present invention simulates and the error of desirable string ripple can effectively reduce, therefore the present invention has the characteristic of high spectrum purity, in addition, when the present invention is applied to protein frequency displacement detecting, because direct synthesizer has high spectrum purity, therefore can guarantee that centre frequency has the highest peak value judged in the scope of frequency sweep, in addition, the present invention need not be via tabling look-up, therefore effective improving operational speed.
Above-mentioned explanation only is the general introduction of technical solution of the present invention, for can clearer understanding technological means of the present invention, and can be implemented according to the content of specification, and for above and other purpose of the present invention, feature and advantage can be become apparent, below especially exemplified by preferred embodiment, and the cooperation accompanying drawing, be described in detail as follows.
Description of drawings
Fig. 1 is according to a preferred embodiment of the present invention, a kind of circuit diagram of direct synthesizer.
Fig. 2 is according to a preferred embodiment of the present invention, and this direct synthesizer is divided equally the simulation drawing that sampling method is simulated with non-.
Fig. 3 is according to a preferred embodiment of the present invention, the simulation drawing that this direct synthesizer is simulated to divide equally sampling method.
Fig. 4 is the circuit block diagram that has known direct synthesizer now.
100: direct synthesizer
110: 111: the three adders of phase accumulator
112: buffer
120: 121: the first complement unit of phase amplitude transducer
122: 123: the first coefficient elements of first adder
123a: selector 123b the first shift registor
123c: 124: the second coefficient elements of the first multiplexer
124a: the second shift registor 124b: the second multiplexer
125: 126: the three coefficient elements of squarer
126a: the 3rd shift registor 126b: the second multiplexer
127: 128: the second complement unit of second adder
130: the four adders 140: Quaternary system counting unit
200: direct synthesizer 210: phase accumulator
220: the read only memory 221: memory
222: digital operation unit 223: output stage
230: digital analog converter
Embodiment
Reach technological means and the effect that predetermined goal of the invention is taked for further setting forth the present invention, below in conjunction with accompanying drawing and preferred embodiment, its embodiment of direct synthesizer, structure, feature and effect thereof to foundation the present invention proposes are described in detail as follows.
See also Fig. 1, it is a preferred embodiment of the present invention, a kind of direct synthesizer 100, comprise the phase amplitude transducer 120 that a phase accumulator 110 and is electrically connected this phase accumulator 110, wherein this phase amplitude transducer 120 has one first complement unit 121, one is electrically connected the first adder 122 of this first complement unit 121, one is electrically connected the second coefficient elements 124 of this first complement unit 121 and this first adder 122, one is electrically connected the squarer 125 of this first adder 122, one is electrically connected the first coefficient elements 123 of this first complement unit 121 and this squarer 125, one is electrically connected the 3rd coefficient elements 126 of this first complement unit 121, one second adder 127 and that is electrically connected this first coefficient elements 123 and the 3rd coefficient elements 126 is electrically connected the second complement unit 128 of this second adder 127, this direct synthesizer 100 is by the foregoing circuit framework, and adopting a kind of non-parabola sampling method of dividing equally of second order that is applied to this direct synthesizer 100 to reach the effect of high spectrum purity, the equation of this sampling method is y=a
i* (x+b
i)
2+ c
i(1≤i≤M), wherein y is shake good fortune, a of string ripple
iThe first coefficient that produces for this first coefficient elements 123 is in order to slope, the b that controls the string ripple
iThe second coefficient that produces for this second coefficient elements 124 is in order to control the moving up and down of string ripple, c
iThe 3rd coefficient that produces for the 3rd coefficient elements 126 is that line of cut hop count, the i of 1/4th string ripples is the non-section of dividing equally in order to the move left and right of controlling the string ripple, input signal, M that x produces for this first complement unit 121.
Please consult again Fig. 1, in the present embodiment, this the first complement unit 121 is electrically connected this phase accumulator 110, and this phase accumulator 110 has one the 3rd adder 111 and a buffer 112, this buffer 112 is electrically connected the 3rd adder 111, this phase accumulator 110 is in order to provide this phase amplitude transducer 120 required phase place, this the second complement unit 128 is electrically connected this phase accumulator 110 and this first complement unit 121, in addition, this first coefficient elements 123 has a plurality of selector 123a, a plurality of the first shift registor 123b and a plurality of the first multiplexer 123c, respectively this selector 123a is electrically connected respectively this first shift registor 123b, respectively this first shift registor 123b is electrically connected respectively this first multiplexer 123c, those selectors 123a is electrically connected this squarer 125, those first multiplexers 123c is electrically connected this first complement unit 121 and this second adder 127, in addition, this second coefficient elements 124 has the second multiplexer 124b that one second shift registor 124a and is electrically connected this second shift registor 124a, this second multiplexer 124b is electrically connected this first complement unit 121 and this first adder 122, again, the 3rd coefficient elements 126 has the 3rd multiplexer 126b that one the 3rd shift registor 126a and is electrically connected the 3rd shift registor 126a, the 3rd multiplexer 126b is electrically connected this first complement unit 121 and this second adder 122, in the present embodiment, it has one the 4th adder 130 and a Quaternary system counting unit 140 in addition, the 4th adder 130 is electrically connected this second complement unit 128, this Quaternary system counting unit 140 is electrically connected the 4th adder 130, this Quaternary system counting unit 140 is in order to produce compensation fine setting coefficient, with the last correction as string ripple signal.
Please consult again Fig. 1, the control method of this direct synthesizer 100 is as follows, input the phase-accumulated unit of totally 32 bits in this phase accumulator 110, next, the output of this phase accumulator 110 is obtained 20 bits with the phase truncation technology, and control is used as by its highest order unit [19] exports the laterally zygomorphic control signal of string ripple, the symmetrical control signal of in addition inferior high bit [18] being used as control output string ripple, afterwards, with the input signal x of residue 18 bits and the second coefficient b that this second coefficient elements 124 produces
iAfter the addition, via 125 squares of this squarers, reach again the effect of multiplication with the displacement function of this first coefficient elements 123, in the present embodiment, those selectors 123a by this first coefficient elements 123 selects corresponding string ripple section slope, respectively this selector 123a can select 16 sections non-wherein sections of dividing equally the section displacement, 12 groups of displacement additions after selecting are corresponding string ripple section slope, at last, the 3rd coefficient c that the signal after the displacement and the 3rd coefficient elements 126 is produced
iNon-simulation string ripple computing of dividing equally parabolic interpolation is namely finished in addition.See also Fig. 2 and shown in Figure 3, the present invention divides the simulation of dividing equally sampling method and dividing equally sampling method by software, by analog result as can be known, non-Spurious Free Dynamic Range (the Spurious-free Dynamic Range that divides equally sampling method, SFDR) be 68.67dB, the Spurious Free Dynamic Range of dividing equally sampling method is 64.72dB, the non-Spurious Free Dynamic Range of dividing equally sampling method of dividing equally promotes 3.95dB, it improves reason and is that we carry out the displacement computing with section comparatively linear in the string ripple with same slope, the larger string ripple section of all the other slopes change then is divided into 15 five equilibriums, so the string ripple of its simulation more levels off to desirable string ripple compared to dividing equally sampling method.
The present invention is by this first adder 122, this second adder 127, this squarer 125, this first coefficient elements 123, this second coefficient elements 124 and the 3rd coefficient elements 126, and utilize mathematical equation to adopt approximatioss, to ask for into the output like desirable string ripple, because the string ripple that the present invention simulates and the error of desirable string ripple can effectively reduce, therefore the present invention has the characteristic of high spectrum purity, in addition, when the present invention is applied to protein frequency displacement detecting, because direct synthesizer 100 has high spectrum purity characteristic, therefore can guarantee that centre frequency has the highest peak value judged in the scope of frequency sweep.
The above, it only is preferred embodiment of the present invention, be not that the present invention is done any pro forma restriction, although the present invention discloses as above with preferred embodiment, yet be not to limit the present invention, any those skilled in the art, within not breaking away from the technical solution of the present invention scope, when the technology contents that can utilize above-mentioned announcement is made a little change or is modified to the equivalent embodiment of equivalent variations, in every case be the content that does not break away from technical solution of the present invention, any simple modification that foundation technical spirit of the present invention is done above embodiment, equivalent variations and modification all still belong in the scope of technical solution of the present invention.
Claims (10)
1. direct synthesizer is characterized in that it comprises:
One phase accumulator; And
One phase amplitude transducer, it is electrically connected this phase accumulator, and this phase amplitude transducer has:
One first complement unit;
One first adder, it is electrically connected this first complement unit;
One second coefficient elements, it is electrically connected this first complement unit and this first adder;
One squarer, it is electrically connected this first adder;
One first coefficient elements, it is electrically connected this first complement unit and this squarer;
One the 3rd coefficient elements, it is electrically connected this first complement unit;
One second adder, it is electrically connected this first coefficient elements and the 3rd coefficient elements; And
One second complement unit, it is electrically connected this second adder.
2. direct synthesizer according to claim 1 is characterized in that wherein said phase accumulator has the buffer that one the 3rd adder and is electrically connected the 3rd adder.
3. direct synthesizer according to claim 1 is characterized in that wherein said the first complement unit is electrically connected this phase accumulator.
4. direct synthesizer according to claim 1, it is characterized in that wherein said the first coefficient elements has a plurality of selectors, a plurality of the first shift registor and a plurality of the first multiplexer, respectively this selector is electrically connected respectively this first shift registor, respectively this first shift registor is electrically connected respectively this first multiplexer, described selector is electrically connected this squarer, and described the first multiplexer is electrically connected this first complement unit and this second adder.
5. direct synthesizer according to claim 4, it is characterized in that wherein said the second coefficient elements has the second multiplexer that one second shift registor and is electrically connected this second shift registor, this second multiplexer is electrically connected this first complement unit and this first adder.
6. direct synthesizer according to claim 5, it is characterized in that wherein said the 3rd coefficient elements has the 3rd multiplexer that one the 3rd shift registor and is electrically connected the 3rd shift registor, the 3rd multiplexer is electrically connected this first complement unit and this second adder.
7. direct synthesizer according to claim 1 is characterized in that it has one the 4th adder in addition, and the 4th adder is electrically connected this second complement unit.
8. direct synthesizer according to claim 7 is characterized in that it has a Quaternary system counting unit in addition, and this Quaternary system counting unit is electrically connected the 4th adder.
9. direct synthesizer according to claim 1 is characterized in that wherein said the second complement unit is electrically connected this phase accumulator and this first complement unit.
10. direct synthesizer according to claim 1 is characterized in that it has a kind of non-parabola sampling method of dividing equally of second order that is applied to this direct synthesizer in addition, and the equation of this sampling method is y=a
i* (x+b
i)
2+ c
i(1≤i≤M), wherein a
iBe the first coefficient, b
iBe the second coefficient, c
iBe that the 3rd coefficient, x are that input signal, M are that line of cut hop count, the i of 1/4th string ripples is the non-section of dividing equally.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110212280.9A CN102891680B (en) | 2011-07-22 | 2011-07-22 | Direct frequency synthesizer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110212280.9A CN102891680B (en) | 2011-07-22 | 2011-07-22 | Direct frequency synthesizer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102891680A true CN102891680A (en) | 2013-01-23 |
| CN102891680B CN102891680B (en) | 2015-02-18 |
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|---|---|---|---|
| CN201110212280.9A Expired - Fee Related CN102891680B (en) | 2011-07-22 | 2011-07-22 | Direct frequency synthesizer |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1852023A (en) * | 2005-08-01 | 2006-10-25 | 华为技术有限公司 | Adding-up apparatus and digital circuit unit of its direct digit frequency synthesizing apparatus |
| TW200919944A (en) * | 2007-10-18 | 2009-05-01 | Chung Shan Inst Of Science | Pade approximate calculation and conversion circuit of directly digital frequency synthesizer |
| TW201021427A (en) * | 2008-11-26 | 2010-06-01 | Univ Nat Sun Yat Sen | Direct digital frequency synthesizer and method for calculating coefficients |
| US20110043258A1 (en) * | 2009-08-19 | 2011-02-24 | Chung-Ang University Industry-Academy Cooperation Foundation | Direct digital frequency synthesizer using hybrid digital to analog converter and synthesizing method thereof |
| CN102006066A (en) * | 2009-09-02 | 2011-04-06 | 中国科学院微电子研究所 | ROM-less DDS circuit structure |
-
2011
- 2011-07-22 CN CN201110212280.9A patent/CN102891680B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1852023A (en) * | 2005-08-01 | 2006-10-25 | 华为技术有限公司 | Adding-up apparatus and digital circuit unit of its direct digit frequency synthesizing apparatus |
| TW200919944A (en) * | 2007-10-18 | 2009-05-01 | Chung Shan Inst Of Science | Pade approximate calculation and conversion circuit of directly digital frequency synthesizer |
| TW201021427A (en) * | 2008-11-26 | 2010-06-01 | Univ Nat Sun Yat Sen | Direct digital frequency synthesizer and method for calculating coefficients |
| US20110043258A1 (en) * | 2009-08-19 | 2011-02-24 | Chung-Ang University Industry-Academy Cooperation Foundation | Direct digital frequency synthesizer using hybrid digital to analog converter and synthesizing method thereof |
| CN102006066A (en) * | 2009-09-02 | 2011-04-06 | 中国科学院微电子研究所 | ROM-less DDS circuit structure |
Non-Patent Citations (1)
| Title |
|---|
| XIAOJIN LI ET: "A Direct Digital Frequency Synthesizer Based on Two Segment", 《1EEE TRANSACTIONS ON CONSUMER ELECTRONICS》 * |
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| Publication number | Publication date |
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| CN102891680B (en) | 2015-02-18 |
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Granted publication date: 20150218 Termination date: 20170722 |