Progress Toward A Kilopixel Time-division Multiplexer For Ixo

Details Progress Toward A Kilopixel Time-division Multiplexer For Ixo Progress Toward A Kilopixel Time-division Multiplexer For Ixo

Jan 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21345713d&link_type=abstract

American Astronomical Society, AAS Meeting #213, #457.13; Bulletin of the American Astronomical Society, Vol. 41, p.360

Astronomy and Astrophysics

Astronomy

Scientific paper

The microcalorimeter-array instrument for the International X-ray Observatory (IXO) will require multiplexed readout of a kilopixel-scale array of fast x-ray transition-edge-sensors (TESs). A candidate technology is the SQUID time-division multiplexer (TDM) developed at NIST. In the TDM architecture, the TESs are dc biased. Each TES is coupled to its own first-stage SQUID. Rows of first-stage SQUIDs are turned on one at a time. The signal from the active row in each column is passed to a series-array SQUID amplifier, and then to a room-temperature amplifier. A suite of digital-feedback electronics maintains each first-stage SQUID in a linear portion of its sinusoidal flux-to-voltage transfer curve. Versions of this architecture are in use in several kilopixel-scale TES bolometer instruments, including ACT and SCUBA-2.
Multiplexed readout is typically more difficult for TES microcalorimeter arrays than it is for TES bolometer arrays, due to the relative speed and dynamic range of the signals. We have recently demonstrated the readout of an array of Goddard high-resolution x-ray TESs through the NIST TDM. The detectors have fast time constants (about 280 us), which is in the range being discussed for IXO. Results from these experiments include sub-3 eV average energy resolution in a 2-column x 8-row demonstration. We also present results and calculations to show how the readout architecture will scale to the full kilopixel-scale camera.

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