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Proceedings Paper

AE 152 cascode readout for far-IR focal plane arrays
Author(s): Erick T. Young; James T. Woolaway
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Paper Abstract

The Amber Engineering AE 152 readout is a 32-channel multiplexer built as part of the far-infrared focal plane array development effort for the Space Infrared Telescope Facility (SIRTF). The design of the device addresses a number of constraints peculiar to the operation of germanium photoconductors. In particular, the need for a very high level of bias stability is solved by a non-switched operation of the first stage. Additionally, the readout was optimized for the detector capacitance expected of large bulk photoconductors ( 0.7 pF) and for the slow operating speeds anticipated for this astronomical application. Fabricated in a 1 .25 jim C-MOS process, the circuit utilizes a cascode input stage to provide gain at the front end while avoiding the Miller effect. The AE 152 also includes an internal offset correction and a shift register multiplexer for the output. We present test data for this device at a variety of temperatures, and show read noises as low as 8 electrons at a temperature of 77 K

Paper Details

Date Published: 1 July 1992
PDF: 8 pages
Proc. SPIE 1684, Infrared Readout Electronics, (1 July 1992); doi: 10.1117/12.60495
Show Author Affiliations
Erick T. Young, Steward Observatory/Univ. of Arizona (United States)
James T. Woolaway, Amber Engineering, Inc. (United States)

Published in SPIE Proceedings Vol. 1684:
Infrared Readout Electronics
Eric R. Fossum, Editor(s)

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