SQUID Multiplexing Technique
Original Publication Date: 1986-Nov-01
Included in the Prior Art Database: 2005-Mar-09
This article relates generally to magnetometers employing DC superconducting quantum interference devices (SQUIDs) and, more particularly, to the multiplexing of several input signal sources with a single detection SQUID and the output circuit. A SQUID without any detection circuit can serve as an efficient switch for selectively coupling one of a plurality of input sources to a common detection SQUID and its flux locked loop. This method eliminates the necessity of driving some part of the superconducting loop above the critical temperature and risking noise generation, trapped noise flux or loss of tracking by the detection circuit. Referring to Fig. 1, each of a plurality of input signal sources 1a-1n has a respective array inductance 2a-2n, coupled to its SQUID switch 3a-3n.