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Journal of Low Temperature Physics

, Volume 151, Issue 3–4, pp 952–957 | Cite as

High Dynamic Range SQUID Readout for Frequency-Domain Multiplexers

  • M. Kiviranta
Article
  • 53 Downloads

Abstract

A 16-SQUID array has been designed and fabricated, which shows 0.12 μΦ 0 Hz−1/2 flux noise at 4.2 K. The readout amplifier based on a cryogenic silicon-germanium bipolar transistor employs short-delay negative flux feedback and reaches 7 MHz bandwith for a 1 Φ 0p-p signal. The −1 dB compression is reached approximately at 4.2 Φ 0p-p amplitude when the signal frequency is 1 MHz. In the feedback mode the flux noise is anomalously increased to 0.35 μΦ 0 Hz−1/2.

Keywords

SQUIDs SQUID arrays Cryogenic semiconductor amplifiers 

PACS

85.25.Dq 85.25.Oj 

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Copyright information

© Springer Science+Business Media, LLC 2008

Authors and Affiliations

  1. 1.VTTEspooFinland

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