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On the zero- and first-order interpolation in synthesized wave for testing purposes
Lozano Nieto, Alberto; Rosell Ferrer, Francisco Javier; Pallàs Areny, Ramon
Universitat Politècnica de Catalunya. Departament d'Enginyeria Electrònica; Universitat Politècnica de Catalunya. IEB - Instrumentació Electrònica i Biomèdica
This paper deals with the quality requirements of synthesized sine waves reconstructed through a zero- or first- order hold for testing purposes, in particular when a switching demodulator is used. In this case, the interest is to have great spectral purity near the carrier rather than in all of the band. We show that the best method to obtain great spectral purity in the frequency band close to the synthesized frequency is by using zero-order hold instead of a first-order hold. Results show that even though a first-order hold implies a decrease of total harmonic amplitude distortion (THD), the measured spurious harmonics are kept lower or equal when using a zero-order hold in the 15 closest components. We conclude that in testing applications a zero-order hold (in spite of its greater THD) yields better results.
Peer Reviewed
Àrees temàtiques de la UPC::Enginyeria biomèdica::Electrònica biomèdica
Signal generators
Signal processing
Function generators
Signal synthesis
Test equipment
Staircase waveform
Linear interpolated waveform
Fisrt-order interpolation
Synthesized sine waves
Switching demodulator
Spectreal purity
Zero-order hold
Harmonic amplitude distortion
Generadors de senyal -- Disseny i construcció
Processament del senyal

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