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- W1993395816 abstract "We present a dc superconducting quantum interference device (SQUID) readout circuit operating in the voltage bias mode and called a SQUID bootstrap circuit (SBC). The SBC is an alternative implementation of two existing methods for suppression of room-temperature amplifier noise: additional voltage feedback and current feedback. Two circuit branches are connected in parallel. In the dc SQUID branch, an inductively coupled coil connected in series provides the bias current feedback for enhancing the flux-to-current coefficient. The circuit branch parallel to the dc SQUID branch contains an inductively coupled voltage feedback coil with a shunt resistor in series for suppressing the preamplifier noise current by increasing the dynamic resistance. We show that the SBC effectively reduces the preamplifier noise to below the SQUID intrinsic noise. For a helium-cooled planar SQUID magnetometer with a SQUID inductance of 350 pH, a flux noise of about 3 μΦ0 Hz − 1/2 and a magnetic field resolution of less than 3 fT Hz − 1/2 were obtained. The SBC leads to a convenient direct readout electronics for a dc SQUID with a wider adjustment tolerance than other feedback schemes." @default.
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- W1993395816 date "2010-05-04" @default.
- W1993395816 modified "2023-10-02" @default.
- W1993395816 title "A voltage biased superconducting quantum interference device bootstrap circuit" @default.
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- W1993395816 doi "https://doi.org/10.1088/0953-2048/23/6/065016" @default.
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