Abstract
The SQUID (superconducting quantum interference device) consists of two Josephson junctions incorporated into a superconducting loop. We attached another superconducting loop in parallel to the junctions. The magnetic flux to be measured is introduced into the first loop. The second one is coupled inductively to the tank circuit supplied by an rf current source. Previously we have reported that this configuration allows to pick up a signal voltage from the tank circuit up to 1 mV when the tank circuit is driven by its resonant frequency. In this paper we show that this kind of SQUID also allows to work at a negative detuning from the resonant frequency. It is found that the negative detuning mode improves the output signal voltage and transconductance ratio. The values of these parameters obtained experimentally are 1.8 mV and 9 mV/ϕ O, respectively (ϕ O is the flux quantum).
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