An Active Filter for Delta-Sigma-Modulated Josephson Waveforms

• 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.

Nyckelord

Active filters

Butterworth filters

Delta-sigma modulation

Low-pass filters

Josephson voltage standards

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ref (ämneskategori)

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