Abstract
| Original language | English |
|---|---|
| Pages (from-to) | 1816 - 1819 |
| Number of pages | 4 |
| Journal | IEEE Transactions on Applied Superconductivity |
| Volume | 3 |
| Issue number | 1 |
| DOIs | |
| Publication status | Published - 1993 |
| MoE publication type | A1 Journal article-refereed |
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A coupled DC SQUID with low 1/f noise. / Seppä, Heikki; Kiviranta, Mikko; Satrapinski, Alexandre; Grönberg, Leif; Salmi, Jorma; Suni, Ilkka.
In: IEEE Transactions on Applied Superconductivity, Vol. 3, No. 1, 1993, p. 1816 - 1819.Research output: Contribution to journal › Article › Scientific › peer-review
TY - JOUR
T1 - A coupled DC SQUID with low 1/f noise
AU - Seppä, Heikki
AU - Kiviranta, Mikko
AU - Satrapinski, Alexandre
AU - Grönberg, Leif
AU - Salmi, Jorma
AU - Suni, Ilkka
N1 - Project code: PUO1042
PY - 1993
Y1 - 1993
N2 - A low-noise coupled DC superconducting quantum interference device (SQUID) especially optimized for low frequency is discussed. Using large Josephson junctions and a low loop inductance the contribution of the critical current fluctuation to 1/f noise can be minimized. To minimize the inductance the Josephson junctions are placed in the center of the washer close to the SQUID loop. A scaled-up copper model of the SQUID and the signal coil is used to analyze the impedance of the SQUID loop affected by the signal coil. An equivalent circuit model describing the effective inductance of the SQUID loop as a function of the frequency is used to design appropriate damping of the resonances. The DC SQUID characteristics are smooth and the noise performance of the SQUID does not markedly suffer from resonances. The contribution of the 1/f noise at 1 Hz is found to be about 5*10-7 φ0 √Hz.
AB - A low-noise coupled DC superconducting quantum interference device (SQUID) especially optimized for low frequency is discussed. Using large Josephson junctions and a low loop inductance the contribution of the critical current fluctuation to 1/f noise can be minimized. To minimize the inductance the Josephson junctions are placed in the center of the washer close to the SQUID loop. A scaled-up copper model of the SQUID and the signal coil is used to analyze the impedance of the SQUID loop affected by the signal coil. An equivalent circuit model describing the effective inductance of the SQUID loop as a function of the frequency is used to design appropriate damping of the resonances. The DC SQUID characteristics are smooth and the noise performance of the SQUID does not markedly suffer from resonances. The contribution of the 1/f noise at 1 Hz is found to be about 5*10-7 φ0 √Hz.
U2 - 10.1109/77.233329
DO - 10.1109/77.233329
M3 - Article
VL - 3
SP - 1816
EP - 1819
JO - IEEE Transactions on Applied Superconductivity
JF - IEEE Transactions on Applied Superconductivity
SN - 1051-8223
IS - 1
ER -