Referenced Items are not available for this document.
The nonlinear response of Superconducting Quantum Interference Devices (SQUIDs) has limited their usefulness. We describe the SQUID Operational Amplifier, which consists of several stages of SQUIDs with high open-loop current gain. When connected in a negative-feedback configuration by passing some of the output current through a feedback coil connected to the first stage, the response is linearized. An analog of the semiconductor op-amp, the SQUID op-amp can be used in superconducting equivalents of op-amp circuits such as current amplifiers, current-to-voltage converters, and differentiators. We present experimental results with a ×10 current amplifier as well as a 750 Ω current-to-voltage amplifier which can couple directly to a room-temperature amplifier without a transformer or a feedback line
Published in:
Applied Superconductivity, IEEE Transactions on
(Volume:11
,
Issue:
1
)
Date of Publication: Mar 2001
- Page(s):
- 1265 - 1270
- ISSN :
- 1051-8223
- INSPEC Accession Number:
- 6955930
- Digital Object Identifier :
- 10.1109/77.919580
- Product Type:
- Journals & Magazines
- Date of Current Version :
- 07 August 2002
- Issue Date :
- Mar 2001
- Sponsored by :
- The IEEE Council on Superconductivity
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