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Journal Radioengineering №4 for 2015 г.
Article in number:
Estimation of DDS digital and analog non-linearities impact on LO spectrum in Doppler offsets band
Keywords: frequency synthesizer DAC DDS RAM VCO non-linearities spurs Doppler offsets band amplitude and phase quanti-zation phase truncation error phase accumulator «prohibited» area «permitted» area
Authors:
E.M. Makarychev - Student, Moscow Institute of Physics and Technology (State University) I.A. Grigoryev - 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.
Pages: 105-111
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