A.V. Korolev1

1 JSC «All-Russian Scientific Research Institute of Radio Engineering» (Moscow, Russia)
1 teleret@mail.ru

This article presents is performed and, on this basis, a model of spectrum of the output signal of multichannel digital synthesizer. When such circuits operate on a common load, additional spectral components appear in their output spectrum caused by errors in the formation of this signal. The use of different output signal models depending on the internal structure of the multichannel circuit and error sources complicates spectrum analysis. The article proposes a model of a sampled signal that takes into account the main sources of errors in its formation. Expressions are obtained for calculating the complex spectrum of the output oscillation of a multichannel digital synthesizers circuit foe various operating modes.

Korolev A.V. Simulation of spectrum of output signal for multichannel digital synthesizer. Achievements of modern radioelectronics. 2025. V. 79. № 9. P. 26–35. DOI: https://doi.org/10.18127/ j20700784-202509-04 [in Russian]

1. Beauchamp D., Chugg K.M. Analysis and calibration for wideband times-2 interleaved current-steering DACs. IEEE Transactions on Circuits and Systems I: Regular Papers. 2022. V. 69. № 11. Р. 4429-4442.
2. Jenq Y.C. A review on Fourier spectrum of D/A outputs with non-uniformly sampled data and time-varying clocks. Measurement. 2004. V. 35. № 2. P. 115-121.
3. Jenq Y.C. Direct digital synthesizer with jittered clock. IEEE transactions on instrumentation and measurement. 1997. V. 46. № 3. P. 653-655.
4. Jenq Y.C. Digital-to-analog (D/A) converters with nonuniformly sampled signals. IEEE Transactions on Instrumentation and Measurement. 1996. V. 45. № 1. P. 56-59.
5. Black W.C., Hodges D.A. Time interleaved converter arrays. IEEE Journal of Solid-state circuits. 1980. V. 15. № 6. P. 1022-1029.
6. Jakimenko K.A., Romashov V.V., Doktorov A.N. Optimizacija spektral'nyh harakteristik gibridnyh sintezatorov chastot na osnove bystrodejstvujushhih cifro-analogovyh preobrazovatelej. Radiotehnicheskie i telekommunikacionnye sistemy. 2023. № 3. S. 53-60 [in Russian].
7. Glascott-Jones A. et al. Results from a prototype 6GSps digital to analogue converter with greater than 7 GHz analogue bandwidth. 2016 11th European Microwave Integrated Circuits Conference (EuMIC). IEEE. 2016. P. 385-388.
8. Korolev A.V., Rykov S.G. Analiz fazovyh i amplitudnyh shumov mnogorezhimnyh cifro-analogovyh preobrazovatelej v rezhimah RZ, NRZ i RF. Radiotehnika. 2024. T. 88. № 2. S. 4138-155. DOI: https://doi.org/10.18127/j00338486-202402-17 [in Russian].
9. Clara M. High-performance D/A-converters: Application to digital transceivers. Springer Science & Business Media. 2012. Т. 36.
10. Torosyan A., Willson A.N. Exact analysis of DDS spurs and SNR due to phase truncation and arbitrary phase-to-amplitude errors. Proceedings of the 2005 IEEE International Frequency Control Symposium and Exposition. IEEE. 2005. P. 50–58.
11. Clavier A.G., Panter P.F., Grieg D.D. Distortion in a pulse count modulation system. Transactions of the American Institute of Electrical Engineers. 1947. V. 66. № 1. P. 989-1005.
12. Korolev A.V., Rykov S.G. K voprosu ob izmerenijah fazovyh shumov cifrovyh vychislitel'nyh sintezatorov. Sb. trudov XXXI Mezhdunar. nauch.-tehnich. konf. «Radiolokacija, navigacija, svjaz'». 2025. T. 6. S. 79-88 [in Russian].