The SBRC-190 a cryogenic multiplexer for moderate-background FIR astronomy

Erickson, E.F. and Young, E.T. and Wolf, J. and Asbrock, J.F. and Lum, N.A. (2002) The SBRC-190 a cryogenic multiplexer for moderate-background FIR astronomy. In: Proceedings FAR-IR, SUB-MM & MM Detector Technoloy Workshop, 211408, . NASA. FAR-IR, SUB-MM & MM Detector Technoloy Workshop, Monterey, CA, 1-3 April 2002.

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Abstract

The SBRC 190, a cryogenic multiplexer developed for far-infrared (FIR) photoconductor detectors operating at moderate backgrounds, is described. The circuit is based on the 32-channel CRC 696 CMOS device used on SIRTF. For applications such as encountered on SOFIA or Herschel, the new device permits higher backgrounds, a wider range of backgrounds, faster sampling, and enhanced synchronization of sampling with chopping. A relationship between sampling efficiency and noise requirements needed to achieve background-limited instrument (BLIP) performance is derived. Major design differences relative to the CRC 696 which have been incorporated in the SBRC 190 are: (a) an AC coupled, capacitive feedback transimpedance unit cell, to minimize input offset effects, thereby enabling low detector biases, (b) selectable feedback capacitors to enable operation over a wide range of backgrounds, and (c) clamp and sample & hold output circuits to improve sampling efficiency, which is a concern at the relatively high readout rates required. The paper emphasizes requirements for use on SOFIA, and touches on the design, expected performance, and fabrication of the new multiplexer.

Document Type:

Conference or Workshop Item (Paper)

Additional Information:

LIDO-Berichtsjahr=2003,

Title:

The SBRC-190 a cryogenic multiplexer for moderate-background FIR astronomy

Authors:

Authors	Institution or Email of Authors
Erickson, E.F.	NASA Ames Research Center, Moffett Field, CA, USA
Young, E.T.	Steward Observatory, University of Arizona, Tucson, AZ, USA
Wolf, J.
Asbrock, J.F.	Raytheon IR Center of Excellence, Santa Barbara, CA, USA
Lum, N.A.	Raytheon IR Center of Excellence, Santa Barbara, CA, USA

Date:

2002

Journal or Publication Title:

Proceedings FAR-IR, SUB-MM & MM Detector Technoloy Workshop

Volume:

211408

Page Range:

Editors:

Editors	Email
Wolf, J.
Farhoomand, J.
McCreight, C.R.

Publisher:

NASA

Series Name:

NASA CP

Status:

Published

Keywords:

Multiplexer, Ferninfrarot, Terahertz, Detektor, SOFIA

Event Title:

FAR-IR, SUB-MM & MM Detector Technoloy Workshop, Monterey, CA, 1-3 April 2002

HGF - Research field:

Aeronautics, Space and Transport

HGF - Program:

Space

HGF - Program Themes:

W EW - Erforschung des Weltraums

DLR - Research area:

Space

DLR - Program:

W EW - Erforschung des Weltraums

DLR - Research theme (Project):

UNSPECIFIED

Location:

Berlin-Adlershof

Institutes and Institutions:

Institute of Planetary Research > Institut für Weltraumsensorik und Planetenerkundung
Optical Information Systems > Institut für Weltraumsensorik und Planetenerkundung
Institute of Composite Structures and Adaptive Systems > System Conditioning > Institut für Weltraumsensorik und Planetenerkundung
Remote Sensing Technology Institute > Institut für Weltraumsensorik und Planetenerkundung

Deposited By:

Susanne Pieth

Deposited On:

16 Sep 2005

Last Modified:

14 Jan 2010 19:29

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