Abstract
Several current and proposed cosmic microwave background experiments use transition edge sensor bolometer focal planes coupled to the digital frequency-domain multiplexing (DfMux) electronics. This readout architecture sums bolometer signals in a SQUID array amplifier (SAA). In this study, we investigate the properties of two SAA designs, the SA4b, which is currently used in the DfMux system, and the SA13a. The SA13a design is gradiometric, making it less sensitive to stray magnetic field pickup. It has lower input inductance and is laid out on the chip as a re-configurable array with 6 banks of 64 series SQUIDs that can be arranged in any series and parallel configurations to optimize array noise, peak-to-peak modulation depth, and dynamic output resistance. The SA13a design reported on here is configured with 3 banks in series \(\times \) 2 banks in parallel. The SA4b is a series array of 100 SQUIDs in series, each with an 8-turn input coil.
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27 October 2018
The original version of this article unfortunately contained a mistake in the authors’ affiliation. The affiliations of coauthors were not submitted and published.
27 October 2018
The original version of this article unfortunately contained a mistake in the authors��� affiliation. The affiliations of coauthors were not submitted and published.
Notes
The SQUID Handbook [9] defines linear range in terms of a Taylor expansion of the \(V{-}\varPhi \) curve—we do not derive our linear range from \(V{-}\varPhi \) curves, but our measurement is a way of probing the relative contributions of higher-order terms in this expansion.
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Acknowledgements
SQUID arrays used in this work were fabricated in the NIST-Boulder microfabrication facility. DfMux room-temperature digital electronics used for these measurements were built by the McGill Cosmology Group. DB is supported by an NSF Astronomy and Astrophysics Postdoctoral Fellowship under Award AST-1501422.
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Silva-Feaver, M., Arnold, K., Barron, D. et al. Comparison of NIST SA13a and SA4b SQUID Array Amplifiers. J Low Temp Phys 193, 600–610 (2018). https://doi.org/10.1007/s10909-018-2052-7
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DOI: https://doi.org/10.1007/s10909-018-2052-7