Abstract
| Original language | English |
|---|---|
| Article number | 042017 |
| Journal | Journal of Physics: Conference Series |
| Volume | 507 |
| Issue number | Part 4 |
| DOIs | |
| Publication status | Published - 2014 |
| MoE publication type | A1 Journal article-refereed |
| Event | 11th European Conference on Applied Superconductivity, EUCAS 2013 - Genoa, Italy Duration: 15 Sep 2013 → 19 Sep 2013 Conference number: 11 |
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Some phenomena due to SQUID input properties when local feedback is present. / Kiviranta, Mikko (Corresponding Author); Grönberg, Leif; Beev, Nikolay; van der Kuur, J.
In: Journal of Physics: Conference Series, Vol. 507, No. Part 4, 042017, 2014.Research output: Contribution to journal › Article › Scientific › peer-review
TY - JOUR
T1 - Some phenomena due to SQUID input properties when local feedback is present
AU - Kiviranta, Mikko
AU - Grönberg, Leif
AU - Beev, Nikolay
AU - van der Kuur, J
PY - 2014
Y1 - 2014
N2 - We have constructed a two-stage SQUID amplifier, in which series-mixing local feedback has been used to screen the SQUID input inductances and hence to boost the power gain of the amplifier. 2.9 pA/Hz1/2 current noise and 2.9 nH input inductance of the lower SQUID stage imply energy resolution of 18 times Planck constant at 4.2 K, which, arguably, can be further improved by input inductance screening. The upper stage consists of a 184-series 4-parallel SQUID array, which, when used alone, shows lower than 0.03 µF 0/Hz1/2 flux noise, but which as a part of the two-stage amplifier is operated at a higher flux noise level to provide robust, EMI-tolerant output signal. The series-mixing feedback also facilitates negative SQUID input impedance, which would allow self-oscillating SQUID-based frequency domain multiplexing
AB - We have constructed a two-stage SQUID amplifier, in which series-mixing local feedback has been used to screen the SQUID input inductances and hence to boost the power gain of the amplifier. 2.9 pA/Hz1/2 current noise and 2.9 nH input inductance of the lower SQUID stage imply energy resolution of 18 times Planck constant at 4.2 K, which, arguably, can be further improved by input inductance screening. The upper stage consists of a 184-series 4-parallel SQUID array, which, when used alone, shows lower than 0.03 µF 0/Hz1/2 flux noise, but which as a part of the two-stage amplifier is operated at a higher flux noise level to provide robust, EMI-tolerant output signal. The series-mixing feedback also facilitates negative SQUID input impedance, which would allow self-oscillating SQUID-based frequency domain multiplexing
U2 - 10.1088/1742-6596/507/4/042017
DO - 10.1088/1742-6596/507/4/042017
M3 - Article
VL - 507
JO - Journal of Physics: Conference Series
JF - Journal of Physics: Conference Series
SN - 1742-6588
IS - Part 4
M1 - 042017
ER -