Conversion efficiency of a large-β DC-SQUID with a resistively shunted inductance

Satoshi Kohjiro, Keiji Enpuku, Keiji Yoshida, Kaoru Yamafuji

Research output: Contribution to journalArticlepeer-review


The conversion efficiency between a signal magnetic flux and the output power of a large-β dc SQUID, i.e., a SQUID with a modulation parameter β larger than unity, have been studied theoretically. In our investigation the inductance of the SQUID was shunted by using a damping resistor. The dependence of the output power on such SQUID parameters as β, the McCumberparameter βcand the damping parameter γ=RsRd(Rsand Rdare the shunt and the damping resistances, respectively) was investigatedin detail. It has been shown that an order-of-magnitude increase in the output power can be realized with a large-β SQUID without a degradation of noise characteristics, compared with thecaseof β=1. It has also been shown that the values of βc=0.4 and γ=1areoptimum with regard to a large output power and a low-noise operation of the SQUID.

Original languageEnglish
Pages (from-to)214-218
Number of pages5
JournalJapanese Journal of Applied Physics
Issue number2R
Publication statusPublished - Feb 1988

All Science Journal Classification (ASJC) codes

  • Engineering(all)
  • Physics and Astronomy(all)


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