Superconducting constant current source
US7002366B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 20, 2003 |
| Grant date | Feb 21, 2006 |
| Priority date | — |
| Expiry date | Aug 20, 2023 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05F1/46
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
An on-chip current regulator for a superconducting logic circuit isolates the superconducting logic circuit from external noise, reduces the effects of process fluctuations on the performance of the logic circuit and significantly reduces total circuit power requirements. The on-chip current regulator in accordance with the present invention includes one or more hysteretic Josephson junctions each connected in parallel with a resistor forming a resistively shunted junction (RSJ) or includes a self-shunting junction. One RSJ may be coupled between an off-chip current regulator and the hysteretic Josephson junction that functions as a current limiting resistor and provides improved isolation from external noise. One or more RSJs may be coupled between the hysteretic Josephson junction and the superconducting logic circuit which functions as a biasing resistor but at the same time reducing the sensitivity of the superconducting logic circuit to any process fluctuations in the biasing resistor which improves manufacturing yield. In an alternate embodiment of the invention, one or more RSJs can be used in place of the RSJ and the biasing resistor. In another alternate embodiment of the …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.