Dc SQUID array with nonlinear inductance

Abstract

We show that voltage response of dc SQUID can be substantially linearized by the introduction of a nonlinear inductance. The inductance tuning allows us to achieve the response linearity as high as 120 dB. Such a nonlinear inductance can be easily formed using Josephson junction inductance. To obtain high dynamic range commensurate to the high response linearity, one can use series array of the nonlinear inductance dc SQUIDs. © 2010 IOP Publishing Ltd.