Title :
An Active Filter for Delta-Sigma-Modulated Josephson Waveforms
Author :
Bergsten, Tobias ; Eklund, Gunnar ; Tarasso, Valter ; Rydler, Karl-Erik
Author_Institution :
SP Tech. Res. Inst. of Sweden, Borås, Sweden
Abstract :
We present the design and electrical characteristics of an active low-pass filter. It will be used in a reference waveform source based on a programmable Josephson voltage standard with multilevel delta-sigma modulation to generate accurate and spectrally pure arbitrary waveforms. The filter has a fifth-order Butterworth characteristic with high input impedance, low distortion, high stopband attenuation, and stable passband performance, including dc.
Keywords :
Butterworth filters; active filters; delta-sigma modulation; low-pass filters; measurement standards; superconducting junction devices; voltage measurement; waveform generators; Josephson waveform; active low-pass filter; arbitrary waveform generation; electrical characteristics; fifth-order Butterworth characteristic; multilevel delta-sigma modulation; programmable Josephson voltage standard; reference waveform source; Attenuation; Cutoff frequency; Impedance; Passband; Standards; Temperature measurement; Uncertainty; Active filters; Butterworth filters; Josephson voltage standards; analog circuits; harmonic distortion; josephson voltage standards; low-pass filters; phase distortion; temperature dependence; temperature dependence.;
Journal_Title :
Instrumentation and Measurement, IEEE Transactions on
DOI :
10.1109/TIM.2015.2418454
