Single-Flux-Quantum Bipolar Digital-to-Analog Converter Comprising Polarity-Switchable Double-Flux-Quantum Amplifier

We present a single-flux-quantum (SFQ)-based digital-to-analog converter (DAC) generating bipolar output voltages, in which the key component is a polarity-switchable double-flux-quantum amplifier (PS-DFQA). The DAC comprised a dc/SFQ converter, an 8-bit variable pulse-number multiplier (PNM), and a...

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Bibliographic Details
Published in:IEEE transactions on applied superconductivity 2017-06, Vol.27 (4), p.1-4
Main Authors: Mizugaki, Yoshinao, Watanabe, Tomoki, Shimada, Hiroshi
Format: Article
Language:English
Subjects:
Circuit design
Digital to analog conversion
Digital to analog converters
Digital-analog conversion
Electric potential
Flux
Josephson effect
Junctions
Libraries
Multiplication
Niobium
Pulse frequency modulation
Quantum amplifiers
Reference signals
Room temperature
Semiconductor device measurement
superconducting integrated circuits
Switches
Synchronism
Temperature measurement
Voltage
Voltage control
Waveforms
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Description
Summary:We present a single-flux-quantum (SFQ)-based digital-to-analog converter (DAC) generating bipolar output voltages, in which the key component is a polarity-switchable double-flux-quantum amplifier (PS-DFQA). The DAC comprised a dc/SFQ converter, an 8-bit variable pulse-number multiplier (PNM), and a ±8-fold PS-DFQA integrated on a single chip. SFQ pulse-frequency modulation was employed to realize variable output voltage amplitude, for which the multiplication factor of the variable-PNM was controlled by a commercial data generator situated at room temperature. The variable-PNM realized 8-bit resolution with a multiplication factor between 0 and 255. Bias currents fed to the ±8-fold PS-DFQA were polarity switched in synchronization with the digital code for the variable-PNM. The whole circuits including I/O elements were designed using SFQ cell libraries, and fabricated using a niobium integration process. Sinusoidal bipolar voltage waveform of 0.38 mVpp was demonstrated using a reference signal source of 43.94 MHz.
ISSN:1051-8223
1558-2515
DOI:10.1109/TASC.2016.2625739