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Proceedings Paper

Digital frequency domain multiplexing readout electronics for the next generation of millimeter telescopes
Author(s): Amy N. Bender; Jean-François Cliche; Tijmen de Haan; Matt A. Dobbs; Adam J. Gilbert; Joshua Montgomery; Neil Rowlands; Graeme M. Smecher; Ken Smith; Andrew Wilson
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Paper Abstract

Frequency domain multiplexing (fMux) is an established technique for the readout of transition-edge sensor (TES) bolometers in millimeter-wavelength astrophysical instrumentation. In fMux, the signals from multiple detectors are read out on a single pair of wires reducing the total cryogenic thermal loading as well as the cold component complexity and cost of a system. The current digital fMux system, in use by POLARBEAR, EBEX, and the South Pole Telescope, is limited to a multiplexing factor of 16 by the dynamic range of the Superconducting Quantum Interference Device pre-amplifier and the total system bandwidth. Increased multiplexing is key for the next generation of large format TES cameras, such as SPT-3G and POLARBEAR2, which plan to have on the of order 15,000 detectors. Here, we present the next generation fMux readout, focusing on the warm electronics. In this system, the multiplexing factor increases to 64 channels per module (2 wires) while maintaining low noise levels and detector stability. This is achieved by increasing the system bandwidth, reducing the dynamic range requirements though active feedback, and digital synthesis of voltage biases with a novel polyphase filter algorithm. In addition, a version of the new fMux readout includes features such as low power consumption and radiation-hard components making it viable for future space-based millimeter telescopes such as the LiteBIRD satellite.

Paper Details

Date Published: 23 July 2014
PDF: 15 pages
Proc. SPIE 9153, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy VII, 91531A (23 July 2014); doi: 10.1117/12.2054949
Show Author Affiliations
Amy N. Bender, McGill Univ. (Canada)
Jean-François Cliche, McGill Univ. (Canada)
Tijmen de Haan, McGill Univ. (Canada)
Matt A. Dobbs, McGill Univ. (Canada)
Canadian Institute for Advanced Research (Canada)
Adam J. Gilbert, McGill Univ. (Canada)
Joshua Montgomery, McGill Univ. (Canada)
Neil Rowlands, COM DEV Canada (Canada)
Graeme M. Smecher, Three-Speed Logic, Inc. (Canada)
Ken Smith, COM DEV Canada (Canada)
Andrew Wilson, COM DEV Canada (Canada)

Published in SPIE Proceedings Vol. 9153:
Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy VII
Wayne S. Holland; Jonas Zmuidzinas, Editor(s)

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