Coded data generation or conversion – Analog to or from digital conversion – With particular solid state devices
Patent
1991-06-06
1992-08-18
Hoff, Marc
Coded data generation or conversion
Analog to or from digital conversion
With particular solid state devices
341143, H03M 300
Patent
active
051403242
ABSTRACT:
A superconducting sigma-delta analog-to-digital converter utilizes a superconducting inductor as the integrator and a Josephson junction connected in series between the inductor and ground as the quantizer. A SQUID generates sampling pulses at a selected GHz frequency which add to the inductor current flowing through the Josephson junction. When the combined current through the Josephson junction exceeds the critical current of the Josephson junction, a voltage pulse is generated which kicks back into the inductor to reduce the inductor current. The voltage across the Josephson junction is, therefore, a one bit digital representation of the analog signal. This one bit digital signal is converted to a multi-bit digital signal preferably by a decimator having superconducting circuits which reduce the frequency of the multi-bit digital signal to a frequency which can be further processed by semiconductor processors. Preferably, a weighting function is utilized in a conversion to improve accuracy.
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Miller Donald L.
Naviasky Eric H.
Przybysz John X.
Hoff Marc
Lenart R. P.
Westinghouse Electric Corp.
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