Linearized superconducting quantum interference device array for high bandwidth frequency-domain readout multiplexing

Lanting, T.; Dobbs, M.; Spieler, H.; Lee, A. T.; Yamamoto, Y.
September 2009
Review of Scientific Instruments;Sep2009, Vol. 80 Issue 9, p094501
Academic Journal
We have designed and demonstrated a superconducting quantum interference device (SQUID) array linearized with cryogenic feedback. To achieve the necessary loop gain, a 300-element series array SQUID is constructed from three monolithic 100-element series arrays. A feedback resistor completes the loop from the SQUID output to the input coil. The short feedback path of this linearized SQUID array (LISA) allows for a substantially larger flux-locked loop bandwidth as compared to a SQUID flux-locked loop that includes a room temperature amplifier. The bandwidth, linearity, noise performance, and 3 [uppercase_phi_synonym]0 dynamic range of the LISA are sufficient for its use in our target application: the multiplexed readout of transition-edge sensor bolometers.


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