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- W3100305510 abstract "We developed a scanning DC SQUID microscope with novel readout electronics capable of wideband sensing RF magnetic fields from 50 to 200 MHz and simultaneously providing closed-loop response at kHz frequencies. To overcome the 20 MHz bandwidth limitation of traditional closed-loop SQUIDs, a flux-modulated closed loop simultaneously locks the SQUID quasi-static flux and flux-biases the SQUID for amplification of the RF flux up to $Phi_0/4$ in amplitude. Demodulating the SQUID voltage with a double lock-in technique yields a signal representative of both the amplitude and phase of the RF flux. This provides 80 dB of a linear dynamic range with the flux noise density of 4 $mu Phi_0/sqrt{Hz}$ at 200 MHz for $YBa_2Cu_3O_7$ bi-crystal SQUID at 77 K. We describe the electronics performance and present images for RF magnetic field of the travelling wave in a coplanar waveguide, the standing wave in an open-circuited microstrip, and a surface mounted device antenna." @default.
- W3100305510 created "2020-11-23" @default.
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- W3100305510 date "2014-03-18" @default.
- W3100305510 modified "2023-09-26" @default.
- W3100305510 title "A scanning SQUID microscope with 200 MHz bandwidth" @default.
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- W3100305510 doi "https://doi.org/10.1088/0953-2048/27/4/044032" @default.
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