SQUID operational amplifier

被引：21

作者：

Irwin, KD

Huber, ME

机构：

[1] Natl Inst Stand & Technol, Boulder, CO 80305 USA

[2] Univ Colorado, Dept Phys, Denver, CO 80217 USA

来源：

IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY | 2001年 / 11卷 / 01期

关键词：

feedback circuits; SQUIDs; superconducting devices;

D O I：

10.1109/77.919580

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

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. rin 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 x10 current amplifier as well as a 750 Omega current-to-voltage amplifier which can couple directly to a room-temperature amplifier without a transformer or a feedback line.

引用

页码：1265 / 1270

页数：6

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