Digital frequency synthesizer
阅读：479发布：2023-05-06
专利汇可以提供Digital frequency synthesizer专利检索，专利查询，专利分析的服务。并且A digital frequency synthesizer using modulo 10N accumulator means for receiving signals corresponding to a predetermined frequency output and for successively generating signals corresponding to addresses in a storage means, each of the addresses corresponding to a storage location which stores digital values corresponding to at least the magnitude of a plurality of digital samples of the output signal from the synthesizer. A digital-to-analog converter converts the output of the storage means into a step-type waveform which is passed through a low pass filter to generate a smooth output waveform from the system. In order to reduce the size of the required storage device, sign and quadrature symmetry may be taken advantage of by making use of the redundancy of the magnitude of values in a sinusoidal signal generator.，下面是Digital frequency synthesizer专利的具体信息内容。
1. A digital frequency synthesizer comprising: input means for setting a predetermined output frequency and for generating digital signals representing said predetermined output frequency; storage means having a plurality of storage locations for storing a plurality of digital values corresponding to at least the magnitude of a plurality of digital samples of the output signal from said synthesizer; modulo 10N Accumulator means receiving output signals from said input means for generating successive signals corresponding to respective storage addresses of respective storage locations in said storage means; a fixed frequency standard coupled to said accumulator means for causing said accumulator means to generate said successive signals; said storage means being responsive at least to the output of said modulo 10N accumulator means for generating output signals corresponding to the digital values stored at the storage locations represented by the address signals coupled thereto from said modulo 10N accumulator means; a digital-to-analog converter coupled to the output of said storage means for generating a step-type representation of the output signal from said synthesizer as a function of said samples represented by the output of said storage means; and a low pass filter coupled to the output of said digital-toanalog converter and responsive to said step-type representation for generating a smoothed output signal having said predetermined frequency.
2. The frequency synthesizer of claim 1 wherein said output signal from said synthesizer is a sinusoidal waveform.
3. The frequency synthesizer according to claim 1 wherein said low pass filter is a passive analog low pass filter.
4. The frequency synthesizer according to claim 1 wherein said modulo 10N accumulator means includes at least one modulo 1000 accumulator.
5. The frequency synthesizer according to claim 1 wherein said modulo 10N accumulator means includes a plurality of cascaded modulo 10N accumulators, the overflow signal of one accumulator being coupled to an input of the next successive accumulator, each accumulator receiving selective signals from said input means corresponding to predetermined digits of the predetermined output frequency.
6. The frequency synthesizer according to claim 5 wherein each of said cascaded modulo 10N accumulators are modulo 1000 accumulators.
7. The frequency synthesizer according to claim 5 wherein the accumulator corresponding to the more significant of said digits has its outputs coupled to said storage means to provide said address signals.
8. A digital frequency synthesizer comprising: input means for setting a predetermined output frequency and for generating digital signals representing said predetermined output frequency; storage means having a plurality of storage locations for storing a plurality of digital values corresponding to at least the magnitude of a plurality of digital samples of the output signal from said synthesizer; accumulator means receiving output signals from said input means for generating successive signals corresponding to respective storage addresses of respective storage locations in said storage means; said storage means being responsive at least to the output of said accumulator means for generating output signals corresponding to the digital values stored at the storage locations represented by the address signals coupled thereto from said accumulator means; generating means at least responsive to an output of said accumulator means for generating at least a signal representing a quadrant of the output signal from said synthesizer at a particular point in time; first complementing means responsive to the output of said accumulating means and to said quadrant signal for selectively complementing the output of said accumulating means as a function of said quadrant signal, the output of said first complementing means corresponding to predetermined storage locations in said storage means; a digital-to-analog converter coupled to the output of said storage means for generating a step-type representation of the output signal from said synthesizer as a function of said samples represented by the output of said storage means; and a low pass filter coupled to the output of said digital-to-analog converter and responsive to said step-type rEpresentation for generating a smoothed output signal having said predetermined frequency.
9. The frequency synthesizer of claim 8 further comprising a fixed frequency standard coupled to said accumulator means for causing said accumulator means to generate said successive signals.
10. The frequency synthesizer of claim 8 wherein said accumulator means is a module 10N accumulator means.
11. The frequency synthesizer of claim 10 wherein said accumulator includes a modulo 1000 accumulator and wherein said first complementing means is a 999''s complementor.
12. The frequency synthesizer of claim 8 wherein said generating means further generates a SGN signal representing the sign of the output signal at a particular point in time with reference to a given reference level, and including second complementing means receiving the outputs from said storage means for selectively complementing the outputs of said storage means as a function of said SGN signal, thereby generating the digital representation of sample values having positive or negative polarity with respect to a given reference level.
13. A digital frequency synthesizer comprising: input means for setting a predetermined output frequency and for generating digital signals representing said predetermined output frequency; storage means having a plurality of storage locations for storing a plurality of digital values corresponding to at least the magnitude of a plurality of digital samples of the output signal from said synthesizer; accumulator means receiving output signals from said input means for generating successive signals corresponding to respective storage addresses of respective storage locations in said storage means; said storage means being responsive at least to the output of said accumulator means for generating output signals corresponding to the digital values stored at the storage locations represented by the address signals coupled thereto from said accumulator means; generating means at least responsive to an output of said accumulator means for generating a SGN signal representing the sign of the output signal at a particular point in time with reference to a given reference level; second complementing means receiving the outputs from said storage means for selectively complementing the outputs of said storage means as a function of said SGN signal, thereby selectively generating the digital representation of sample values having positive and negative polarity with respect to a given reference level; a digital-to-analog converter coupled at least to the output of said second complementing means for generating a step-type representation of the output signal from said synthesizer as a function of said samples represented at least by the output of said second complementing means; and a low pass filter coupled to the output of said digital-to-analog converter and responsive to said step-type representation for generating a smoothed output signal having said predetermined frequency.
14. The frequency synthesizer of claim 13 further comprising a fixed frequency standard coupled to said accumulator means for causing said accumulator means to generate said successive signals.
15. The frequency synthesizer of claim 13 wherein said accumulator means is a modulo 10N accumulator means.
16. The frequency synthesizer of claim 13 wherein said digital-to-analog converter is coupled to said generating means and is responsive to said SGN signal.
17. A digital frequency synthesizer comprising: input means for setting a predetermined output frequency and for generating digital signals representing said predetermined output frequency; storage means having a plurality of storage locations for storing a plurality of digital values corresponding to at least the magnitude of a plurality of least significant bits of said digital samples of the output signal from said synthesizer; accumulator means receiving output signals from said input means for generating successive signals corresponding to respective storage addresses of respective storage locations in said storage means; said storage means being responsive at least to the output of said accumulator means for generating output signals corresponding to the digital values stored at the storage locations represented by the address signals coupled thereto from said accumulator means; logic means responsive to the output of said storage means and responsive to the address signals supplied to said storage means for generating the more significant bits of said samples which are not stored in said storage means; a digital-to-analog converter coupled to the outputs of said storage means and said logic means for generating a step-type representation of the output signal from said synthesizer as a function of said samples; and a low pass filter coupled to the output of said digital-to-analog converter and responsive to said step-type representation for generating a smoothed output signal having said predetermined frequency.
18. The frequency synthesizer of claim 17 further comprising a fixed frequency standard coupled to said accumulator means for causing said accumulator means to generate said successive signals.
19. The frequency synthesizer of claim 17 wherein said accumulator means is a modulo 10N accumulator means.
20. The frequency synthesizer of claim 17 wherein said logic means is responsive to the most significant bit of the output of said storage means and to a plurality of the most significant bits of the address signals fed to the storage means.
21. The frequency synthesizer of claim 17 including generating means at least responsive to an output of said accumulator means for generating at least a signal representing a quadrant of the output signal from said synthesizer at a particular point in time, and including first complementing means responsive to the output of said accumulator means and to said quadrant signal for selectively complementing the output of said accumulating means as a function of said quadrant signal, the output of said first complementing means corresponding to predetermined storage locations in said storage means.
22. The frequency synthesizer of claim 21 wherein said generating means further generates a SGN signal representing the sign of the output signal at a particular point in time with reference to a given reference level, and including second complementing means receiving the outputs from said storage means for selectively complementing the outputs of said storage means as a function of said SGN signal, thereby generating the digital representation of sample values having positive or negative polarity with respect to a given reference level.
23. The frequency synthesizer of claim 17 wherein said generating means further generates a SGN signal representing the sign of the output signal at a particular point in time with reference to a give reference level, and including second complementing means receiving the outputs from said storage means for selectively complementing the outputs of said storage means as a function of said SGN signal, thereby generating the digital representation of sample values having positive or negative polarity with respect to a given reference level.
24. A digital frequency synthesizer comprising: input means for setting a predetermined output frequency and for generating digital signals representing said predetermined output frequency; storage means having a plurality of storage locations for storing a plurality of digital values corresponding to at least the truncated magnitude of a plurality of digital samples of the output signal from said synthesizer; accumulator means receiving output signals from said input means for generating successive signals corresponding to respective storage addresses of respective storage locations in said storage means; said storage means being responsive at least to the output of said accumulator means for generating output signals corresponding to the digital values stored at the storage locations represented by the address signals coupled thereto from said accumulator means; generating means for generating a SGN signal representing the sign of the output signal at a particular point in time with reference to a given reference level; a 1''s complementing means receiving the outputs from said storage means and responsive to said SGN signal to selectively complement the outputs of said storage means as a function of said SGN signal, thereby selectively generating the digital representation of sample values having positive and negative polarity with respect to a given reference level; a digital-to-analog converter coupled at least to the output of said 1''s complementing means for generating a step-type representation of the output signal from said synthesizer as a function of said samples represented by the output of said 1''s complementing means; and a low pass filter coupled to the output of said digital-to-analog converter and responsive to said step-type representation for generating a smoothed output signal having said predetermined frequency.
25. The frequency synthesizer of claim 24 further comprising a fixed frequency standard coupled to said accumulator means for causing said accumulator means to generate said successive signals.
26. The frequency synthesizer of claim 24 wherein said accumulator means is a modulo 10N accumulator means.
27. The frequency synthesizer of claim 24 wherein said generating means further includes means for generating at least a signal representing a quadrant of the output signal from said synthesizer at a particular point in time, and including first complementing means responsive to the output of said accumulating means and to said quadrant signal for selectively complementing the output of said accumulating means as a function of said quadrant signal, the output of said first complementing means corresponding to predetermined storage locations in said storage means.
28. The frequency synthesizer of claim 27 wherein said storage means stores a plurality of digital values corresponding to a plurality of least significant bits of said digital samples, and including logic means responsive to the output of said storage means and responsive to the address signals supplied to said storage means for generating the more significant bits of said samples which are not stored in said storage means.
29. The frequency synthesizer of claim 24 wherein said storage means stores a plurality of digital values corresponding to a plurality of least significant bits of said digital samples, and including logic means responsive to the output of said storage means and responsive to the address signals supplied to said storage means for generating the more significant bits of said samples which are not stored in said storage means.
30. A digital frequency synthesizer comprising: input means for setting a predetermined output frequency and for generating digital signals representing said predetermined output frequency; storage means having a plurality of storage locations for storing a plurality of digital values corresponding to at least the magnitude of a plurality of digital samples of the output signal from said synthesizer; accumulator means receiving output signals from said input means for generating successive signals corresponding to respective storage addresses of respective storage locations in said storage means; second generating means responsive to said accumulator means and to said input means for generating at least one more significant bit of the digital representation of the output frequency of the synthesizer, said at least one more significant bit being coupled to said storage means as an address signal in combination with the output from said accumulator means; said storage means being responsive at least to the output of said accuMulator means and of said second generating means for generating output signals corresponding to the digital values stored at the storage locations represented by the address signals coupled thereto; a digital-to-analog converter coupled to the output of said storage means for generating a step-type representation of the output signal from said synthesizer as a function of said samples represented by the output of said storage means; and a low pass filter coupled to the output of said digital-to-analog converter and responsive to said step-type representation for generating a smoothed output signal having said predetermined frequency.
31. The frequency synthesizer of claim 30 further comprising a fixed frequency standard coupled to said accumulator means for causing said accumulator means to generate said successive signals.
32. The frequency synthesizer of claim 30 wherein said accumulator means is a modulo 10N accumulator means.
33. The frequency synthesizer of claim 30 wherein said second generating means generates a signal representing the quadrant of the output signal from said synthesizer at a particular point in time, and a SGN signal representing the sign of the output signal at a particular point in time with reference to a give reference level.
34. The frequency synthesizer of claim 33 including first complementing means responsive to the signal representing a quadrant of the output signal and to the output of said accumulating means for selectively complementing the output of said accumulating means as a function of said quadrant signal, the output from said first complementing means being coupled to said storage means as address signals, and including second complementing means receiving the outputs from said storage means and for selectively complementing the outputs of said storage means as a function of said SGN signal, thereby selectively generating the digital representation of sample values having positive and negative polarity with respect to a given reference level.
35. The frequency synthesizer of claim 33 wherein said storage means stores a plurality of digital values corresponding to a plurality of least significant bits of said digital samples, and including logic means responsive to the output of said storage means and responsive to the address signals supplied to said storage means for generating the more significant bits of said samples which are not stored in said storage means.
36. A digital frequency synthesizer comprising: input means for setting a predetermined output frequency and for generating digital signals representing said predetermined output frequency; storage means having a plurality of storage locations for storing a plurality of digital values corresponding to at least the rounded-off magnitudes of a plurality of digital samples of the output signal from said synthesizer; accumulator means receiving output signals from said input means for generating successive signals corresponding to respective storage addresses of respective storage locations in said storage means; said storage means being responsive at least to the output of said accumulator means for generating output signals corresponding to the digital values stored at the storage locations represented by the address signals coupled thereto from said accumulator means; generating means for generating a SGN signal representing the sign of the output signal at a particular point in time with reference to a given reference level; a 2''s complementing means receiving the outputs from said storage means and responsive to said SGN signal to selectively complement the outputs of said storage means as a function of said SGN signal, thereby selectively generating the digital representation of sample values having positive and negative polarity with respect to a given reference level; a digital-to-analog converter coupled at least to the output of said 2''s complementing means for generating a stEp-type representation of the output signal from said synthesizer as a function of said samples represented by the output said 2''s complementing means; and a low pass filter coupled to the output of said digital-to-analog converter and responsive to said step-type representation for generating a smoothed output signal having said predetermined frequency.
37. The frequency synthesizer of claim 36 further comprising a fixed frequency standard coupled to said accumulator means for causing said accumulator means to generate said successive signals.
38. The frequency synthesizer of claim 36 wherein said accumulator means is a modulo 10N accumulator means.
39. A digital frequency synthesizer for generating a sinusoidal output signal comprising: input means for setting a predetermined output frequency and for generating digital signals representing said predetermined output frequency; storage means having a plurality of storage locations for storing a plurality of digital values corresponding to at least the magnitude of a plurality of digital samples of the output signal from said synthesizer, said storage means storing at each location a predetermined number of bits which is less than the total number of bits required to represent said digital values corresponding to said samples; means responsive to said input means for generating successive signals corresponding to respective storage addresses of respective storage locations in said storage means for causing said storage means to provide outputs corresponding to respective samples of the predetermined frequency sinusoidal output of said synthesizer; logic means responsive to the most significant bit of the output of said storage means and to a plurality of the most significant bits of the address signals fed to said storage means for generating the most significant bits of the digital values corresponding to said samples of said output signal; a digital-to-analog converter coupled to the output of said storage means and to the output of said logic means for generating a step-type representation of the output signal from said synthesizer as a function of said samples as represented by the output of said storage means and said logic means; and a low pass filter coupled to the output of said digital-to-analog converter and responsive to said step-type representation for generating a smoothed output sinusoidal signal having said predetermined frequency.
40. The frequency synthesizer of claim 39 further comprising a fixed frequency standard coupled to said accumulator means for causing said accumulator means to generate said successive signals.
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