Estimation of DDS digital and analog non-linearities impact on LO spectrum in Doppler offsets band
- 1 Student, Moscow Institute of Physics and Technology (State University)
- 2 Post-graduate Student, Engineer, JSC «Radiofizika»
Abstract
This paper introduces non-linear effects research in digital and analog DDS section of C-band hybrid frequency synthesizer. The main goal is to enhance synthesizer output signal spectrum in Doppler offsets frequency band. The work contains estimation results of amplitude/phase quantization as well as DAC non-linearities impact on output frequency synthesizer spectrum.
DDS Digital spectrum computation results shows that amplitude/phase quantization errors are negligeable in total spurs level. DAC non-linearities impact estimation results show that resulting harmonics have a considerable impact on total spurs level. These results also show the demand to existing synthesizer scheme correction. Frequency correction methods, new synthesizer scheme and it-s parameters estimation are also presented in paper.
How to cite
Макарычев Е.М., Григорьев И.А. Оценка влияния нелинейных искажений цифрового и аналогового трактов DDS на спектры гетеродинных сигналов в области доплеровских отстроек // Радиотехника. 2015. № 4. С. 105–111.
References
- A Technical Tutorial on Digital Signal Synthesis. AnalogDevices, Inc. 1999.
- Oppengejjm A., SHafer R. Cifrovaja obrabotka signalov: per. s angl. / Pod red. A.S. Nenasheva M.: Tekhnosfera. 2006.
- Nicholas H.T., Samueli H., Kim B. The Optimization of Direct Digital Frequency Synthesizer in the Presence of Finite Word Length Effects Performance // In Proc. 42nd Annu. FrequencyContr. Symp., June 1988. P. 357−363.
- AD9910 Data Sheet. Analog Devices. 2012.
- Kester U. Proektirovanie sistem cifrovojj i smeshannojj obrabotki signalov: per. s angl. / Pod red. A.A. Vlasenko M.: Tekhnosfera. 2010.