Linearized superconducting quantum interference device array for high bandwidth frequency-domain readout multiplexing.
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 Phi(0) dynamic range of the LISA are sufficient for its use in our target application: the multiplexed readout of transition-edge sensor bolometers.
Lanting
T
T
Department of Physics, McGill University, Montreal H2T 2Y8, Canada. tlanting@dwavesys.com
Dobbs
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M
Spieler
H
H
Lee
A T
AT
Yamamoto
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Y