发明名称 |
Superconducting sigma-delta analog-to-digital converter |
摘要 |
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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申请公布号 |
US5140324(A) |
申请公布日期 |
1992.08.18 |
申请号 |
US19910710856 |
申请日期 |
1991.06.06 |
申请人 |
WESTINGHOUSE ELECTRIC CORP. |
发明人 |
PRZYBYSZ, JOHN X.;MILLER, DONALD L.;NAVIASKY, ERIC H. |
分类号 |
H03M3/02 |
主分类号 |
H03M3/02 |
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