The Combined Method of Logical State Controlling of Criotrons Based on Squids

Abstract

Àíîòàö³ÿ.  ðîáîò³ âäîñêîíàëåíî ìàòåìàòè÷íó ìîäåëü ïåðåõ³äíèõ ïðîöåñ³â â äaeîçåô-ñîí³âñüêèõ åëåìåíòàõ ïàì'ÿò³ (êð³îòðîíàõ), ÿê³ ìîaeíà ñòâîðèòè íà îñíîâ³ íàäïðîâ³äíèõ êâàíòîâèõ ³íòåðôåðîìåòð³â (Ñʲijâ). Êð³îòðîíàìè ñëóaeèëè äâîêîíòàêòí³ ÑʲÄè, êåðó-âàííÿ ëîã³÷íèì ñòàíîì ÿêèõ áóëî äîñë³äaeåíî ìåòîäàìè ìàòåìàòè÷íîãî ìîäåëþâàííÿ. Íàìè çàïðîïîíîâàíî êîìá³íîâàíèé ñïîñ³á êåðóâàííÿ ëîã³÷íèì ñòàíîì òàêèõ êð³îòðîí³â, îñê³ëüêè ïðîñòèé ñïîñ³á êåðóâàííÿ çà äîïîìîãîþ ò³ëüêè ³ìïóëüñ³â ìàãí³òíîãî ïîòîêó íå çàáåçïå÷óº ñòàá³ëüíî¿ ðîáîòè êð³îòðîí³â ï³ä ÷àñ çâîðîòíèõ ëîã³÷íèõ ïåðåõîä³â "1" → "0". Ïîêàçàíî, ùî ïðÿì³ ëîã³÷í³ ïåðåõîäè "0" → "1" ìîaeíà åôåêòèâíî ðåàë³çóâàòè çà äîïîìîãîþ êåðóþ÷èõ ³ì-ïóëüñ³â ìàãí³òíîãî ïîòîêó, à ïåðåõîäè "1" → "0" -êåðóþ÷èõ ³ìïóëüñ³â ñòðóìó. Ðîçðàõîâàíî ïåðåõ³äí³ õàðàêòåðèñòèêè êð³îòðîí³â ï³ä ÷àñ ïðÿìèõ ³ çâîðîòíèõ ëîã³÷íèõ ïåðåõîä³â.Êëþ÷îâ³ ñëîâà: ÑʲÄ, êâàíòîâà êîì³ðêà ïàì'ÿò³, äaeîçåôñîí³âñüêèé êð³îòðîí, ïåðåõ³äíà õàðàêòåðèñòèêà, ëîã³÷íèé ïåðåõ³ä, íàäïðîâ³äíèé ³íòåðôåðîìåòð THE COMBINED METHOD OF LOGICAL STATE CONTROLLING OF CRIOTRONS BASED ON SQUIDS M. V. Tyhanskyi, A.I. PartykaAbstract. In the present work, we have improved the mathematical model of transition processes in Josephson memory cells (cryotrons), which can be created on the base of semiconductor quantum interferometers (SQUIDs). We employed two-contact SQUIDs to construct the cryotrons and investigated the possibilities to control the cryotrons' logical state by means of mathematical modeling. A combined method of logical state controlling of such cryotrons has been proposed since the simpler controlling method, where only impulses of magnetic flux are used, fails to provide stable operation of cryotrons during the inverse logical transitions "1" → "0". We show that the direct logical transitions "0" → "1" are effectively realized via controlling magnetic flux impulses whereas the transitions "1" → "0" are realized via controlling current impulses. Transition characteristics of the cryotrons during direct and inverse logical transitions are calculated.