DIRECT DIGITAL SYNTHESIZER WITH ANGLE MODULATION.

 I. V. Ryabov ¹, E. S. Klyuzhev ², I. V. Strelnikov ³, P. M. Uriev ²

¹ Volga State University of Technology

²FJSC "Mari Machine-building Plant"
³ Company "Novator"

The paper is received on June 7, 2016

Abstract. The paper presents principles of construction and structural-circuit design solutions of synthesizer with angle modulation that are based on the direct method of digital synthesis. The research is focused on the methods of formation of complex wideband signals, as well as structure of DDS frequency synthesizer. Synthesizers with angle modulation are used in radar, navigation, adaptive communications systems as the oscillator of the transmitter and the receiver heterodyne. In modern conditions the operation of such systems meets a number of issues relating to the high level of phase noise. Presented synthesizer has the following competitive advantages: a wide range of operating frequencies, high "spectral purity" of the synthesized signal, high tune speed, good repeatability when replicating. Structural scheme of the Direct digital synthesizer to synthesize signals with angle modulation in the frequency range up to 2 GHz is presented, which can be used in modern radars. Spectrograms of output signals are given.

Key words: direct digital synthesis, direct digital synthesizers, digital-to-analog converter, function converter code-sine, frequency accumulator, phase accumulator, amplitude noise level, phase noise.

References

1. Yampurin N. P. Formirovanie precizionnuih chastot i signalov: Ycheb. posobie / N. P. Yampurin, V. V. Boloznev, E. V. Saphronov, E. B. Zhalnin. – Nizhni Novgorod: Nizhegorodski gosydarstvennui technicheski universitet, 2003. – 187 p. (In Russian).

2. Belov L.A. Phormirovanie stabilnuih chastot i sygnalov. Ì.: IC «Akademiya» Publ., 2005. (In Russian).

3. Ryabov I.V. // Cifrovoi sintez precizionnuih signalov: Monographiya / I.V. Ryabov. – Yoshkar-Ola: Mriiski gosudarstvennui technicheski universitet, 2005. – 152 p. (In Russian).

4. Ryabov I.V. Cifrovuie sintezatorui chastotno-modulirovannuih signalov // Pribory i tekhnika ehksperimenta, 2001. ¹ 2. P.62-69. (In Russian).

5. Ryabov I.V. Cifrovoj sintezator s V-obraznym zakonom izmeneniya chastoty // Pribory i tekhnika ehksperimenta, 2006, ¹ 3. P. 88-90. (In Russian).

6. Ryabov I.V. Digital Synthesizers of Frequency-Modulated Signals // Instruments and Experimental Techniques. V. 44. ¹ 2. 2001. P.62-68.

7. Ryabov I.V. Digital Calculating Synthesizer with V-shaped Law Of Frequency  Change // Instruments and Experimental Techniques. V. 49. ¹3. 2006. P.376-378.

8. Ryabov I.V. Metod pryamogo cifrovogo sinteza precizionnyh signalov // Radiotechnika, 2006. ¹ 9. P.14-17. (In Russian).

9. Patent ¹ 2058659 Rossijskoj Federacii  MKI N03V 19/00. Cifrovoj sintezator chastot / Ryabov I.V., Fishchenko P.A.  Zayavl. 23.09.93. Opubl. 20.04.1996. Byul.¹ 11. 4 p. (In Russian).

10. Patent ¹ 2490789  Rossijskoj Federacii  MPK N03L 7/18. Cifrovoj sintezator fazomodulirovannyh signalov / Ryabov I.V., Dedov A.N., Tolmachev S.V. Zayavl. 18.07.2012. Opubl. 20.08.2013. Byul.¹ 23. 7 p. (In Russian).

11. Vankka, J. Direct digital synthesizers Theory and Application// Proc. Int. Symp. Circuits and Systems ISCAS’03. – 2006. – 210 p.

12. Wang, C.-C. Phase-Adjustable Pipelining ROM-Less Direct Digital Frequency Synthesizer With a 41.66-MHz Output Frequency / C.-C. Wang, J.-M. Huang, Y.-L. Tseng // Circuits and Systems II: Express Briefs, IEEE Transactions. – 2006. – V.53. – P.1143-1147.