Title :
Josephson waveform generation using multilevel Δ-Σ modulation
Author :
Bergsten, Tobias ; Eklund, Gunnar ; Tarasso, Valter
Author_Institution :
SP Tech. Res. Inst. of Sweden, Borås, Sweden
Abstract :
We present a novel method of generating an AC voltage using a programmable Josephson voltage standard. The AC voltage is generated by Δ-Σ (Delta-Sigma) modulation of multiple Josephson levels. Compared with an AC voltage generated by stepwise approximation, the Δ-Σ method reduces the low frequency harmonics of the generated signal. We demonstrate this method by generating a 90 Hz sine wave and measuring the spectrum with a digitizer.
Keywords :
analogue-digital conversion; delta-sigma modulation; waveform generators; AC voltage; Josephson waveform generation; delta-sigma modulation; digitizer; frequency 90 Hz; low frequency harmonics; multilevel Δ-Σ modulation; programmable Josephson voltage standard; sine wave; Frequency modulation; Harmonic analysis; Impedance; Noise; Standards; Voltage measurement; Delta-sigma modulation; Josephson effect; harmonic distortion; metrology; voltage measurement;
Conference_Titel :
Precision Electromagnetic Measurements (CPEM), 2012 Conference on
Conference_Location :
Washington, DC
Print_ISBN :
978-1-4673-0439-9
DOI :
10.1109/CPEM.2012.6250856
