Abstract
We present a sensitive voltage amplifier suited for measurements of source impedances in the k\(\Omega\) range at dilution refrigerator temperatures. The circuit is based on a commercial dc SQUID, an impedance matching transformer, and it works on the principle of negative feedback. At 10 mK, the amplifier contribution to the noise is only 17 \(\text{pV/}\sqrt{\text{ Hz }}\), which is negligible in comparison with the fluctuations of the thermal voltage of a 3.25 k\(\Omega\) metallic source resistor. Various circuit parameters of the amplifier are discussed.
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STAR Cryoelectronics model SQ2600
Acknowledgements
We thank Dr. Robin Cantor of Star Cryoelectronics for kindly sharing information about the flux-lock electronics. This work was supported by the US NSF Grants No. DMR 1505866 and 1904497.
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Shingla, V., Kleinbaum, E. & Csáthy, G.A. A SQUID-Based Picovoltmeter for Quantum Resistors. J Low Temp Phys 201, 170–178 (2020). https://doi.org/10.1007/s10909-020-02388-4
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DOI: https://doi.org/10.1007/s10909-020-02388-4