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Experimental implementation of analog-to-digital converter based on the reversible ripple counter

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9 Author(s)
Filippenko, L.V. ; Inst. of Radio Eng. & Electron., Moscow, USSR ; Kaplunenko, V.K. ; Khabipov, M.I. ; Koshelets, V.P.
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A new A/D converter which includes a comparator, and a reversible binary counter with DC outputs has been designed, fabricated, and tested. The comparator generates two trains of the single-flux-quantum (SFQ) pulses in response to increasing or decreasing input signal. The pulses are transferred through SFQ transmission lines to the adding and diminishing inputs of a reversible counter. The reversible counter has been realized by supplementing the usual counter with the SFQ transmission lines, splitters; and confluence elements for sending diminished pulses directly to each bit. Nondestructive read-out of the counter contents is carried out by SFQ/DC converters connected to each counter bit. The integrated circuit is fabricated using 5-μm Nb-AlO x-Nb Josephson junction technology with a critical current density about 500 A/cm2. External Mo shunts of the junctions provide the value of βc⩽1 and Ic R≈300 μV. The A/D conversion is studied for low-frequency signals with an external clock. High-frequency performance of the reversible counter has been tested

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Magnetics, IEEE Transactions on  (Volume:27 ,  Issue: 2 )