摘要
The voltage biased(SQUID)bootstrap circuit(SBC)was recently introduced as an effective means to reduce the preamplifier noise contribution.We analyze the tolerances of the SBC noise suppression performance to spreads in SQUID and SBC circuit parameters.It is found that the tolerance to spread mainly caused by the integrated circuit fabrication process could be extended by a one-time adjustable current feedback.A helium-cooled niobium SQUID with a loop inductance of 350 pH is employed to experimentally verify the analysis.From this work,design criteria for fully integrated SBC devices with a high yield can be derived.
作者
张国峰
张懿
Hans-Joachim Krause
孔祥燕
Andreas Offenhäusser
谢晓明
ZHANG Guo-Feng;ZHANG Yi;Hans-Joachim Krause;KONG Xiang-Yan;Andreas Offenhäusser;XIE Xiao-Ming(State Key Laboratory of Functional Materials for Informatics,Shanghai Institute of Microsystem and Information Technology,Chinese Academy of Sciences(CAS),Shanghai 200050;Peter Grünberg Institute(PGI-8),Forschungszentrum Jülich(FZJ),D-52425,Jülich,Germany;Joint Research Laboratory on Superconductivity and Bioelectronics,Collaboration between CAS-Shanghai&FZJ,Shanghai 200050)
基金
Supported by the Knowledge Innovation Program of the Chinese Academy of Sciences under Grant No KGCX2-YW-906 and KGCX2-EW-105
the One Hundred Person Project of the Chinese Academy of Sciences.
