Specification and design of the SBRC-190: a cryogenic multiplexer for far-infrared photoconductor detectors

Erickson, E. F.; Young, Erick T.; Wolf, J.; Asbrock, James F.; Lum, Nancy A.

doi:10.1117/12.458823

Cited by 9 publications

(9 citation statements)

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“…The readout we used is the 1 · 32 SBRC190 which is specifically designed for far IR photoconductors operating below 4 K. It is manufactured by Raytheon Vision Systems for SOFIA's AIRES instrument using a 0.8 lm cryo-CMOS process [16]. We have tested a number of these devices in the past and found a CDS (correlated double sampling) read-noise of about 250-350e À [17]; not stellar but a reasonable noise performance nonetheless.…”

Section: Readout Multiplexermentioning

confidence: 98%

“…These readouts must be especially designed for far IR detectors requiring low bias levels to ensure uniformity across the array and adequate dynamic range. CRC696 [13][14][15], successfully used in Spitzer's MIPS instrument, and SBRC190 [16,17], originally developed for SOFIA's AIRES instrument, are capacitive transimpedance amplifiers (CTIA) suitable for far IR detectors.…”

Section: Introductionmentioning

confidence: 99%

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A low noise 2×16 Ge:Sb focal-plane array: Paving the way for large format FPAs for far IR astronomy

Farhoomand

Sisson

Beeman

2007

Infrared Physics & Technology

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Section: Readout Multiplexermentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

A low noise 2×16 Ge:Sb focal-plane array: Paving the way for large format FPAs for far IR astronomy

Farhoomand

Sisson

Beeman

2007

Infrared Physics & Technology

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“…Many of these devices have been tested in our lab and elsewhere [11,12]. The SBRC-190 is a 1x32, multi-gain, capacitive transimpedance amplifier (CITA) designed for use with far infrared detector arrays.…”

Section: -Designmentioning

confidence: 99%

Preliminary test results of a low-noise 2x16 Ge:Sb array with a CTIA readout

2005

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Germanium detectors are extensively used in astronomical instruments for far infrared observations. To meet the science objectives of future space projects, large-format far IR detectors are needed. As a first step toward this goal, we have fabricated a 2x16 Ge:Sb array with the 1x32, SB-190 CTIA cryogenic readout. The detector design as well as the preliminary results of our parametric tests are presented here. The array exhibits very good noise performance with an NEP as low as 4.0E-18 W/√Hz, and confirms the viability of the design for large format arrays.Far infrared and sub millimeter detectors and detector arrays have drawn increasing interest from NASA and the astronomy community is general. In the most recent workshops on far IR and submillimeter detector technology sponsored by NASA in 2002 [1,2], the pivotal role of far IR arrays was reiterated and the need for further advancement in this area was reemphasized. The experts' consensus expressed in these workshops was also emphatically echoed in the report issued by NASA's Infrared, Submillimeter, and Millimeter Detector Working Group (ISMDWG) [3] as well as the Origins Roadmap [4].Far IR arrays constitute the key technology for SOFIA (Stratospheric Observatory For Infrared Astronomy) and the future far IR space telescopes that are currently on the drawing board. NASA's Single Aperture Far-Infrared Observatory (SAFIR) is conceptualized as a 5K, 10m space telescope operating in the 40µm-1mm wavelength range [5,6]. Its target launch-date is 2020. SPICA (SPace Infrared Telescope for Cosmology and Astrophysics), a.k.a. HII/L2, is a Japanese 3.5m space telescope targeted to be launched in 2010 and will cover the 5-200µm wavelength range [7]. Both of these telescopes require large format (larger than 64x64) far IR detector arrays with cryogenic readout multiplexers, the technology that is currently immature.In order to take full advantage of the scientifically rich far IR and submm spectral range, large-format arrays similar to those currently operating in near and mid IR regions are needed. The fundamental advantage of large-format arrays, of course, is that the observing time scales as (Sensitivity) 2 /(Number of pixels). The desire for large formats can best be fulfilled by a suitable direct hybrid architecture employing planar, indium bump-bond technology. Although this technology has been used successfully with short wavelength detectors for many years, its extension to long wavelength (>50µm) is neither automatic nor trivial. This is due to the fact that the operating condition as well as the material for far IR and submm detectors are substantially different than those for the near and mid IR detectors. In particular, the requirement for low bias levels, deep cryogenic operation, the glow from the readout electronics, detector heating, and thermal mismatch between the readout and the detector array impose different restrictions that are incompatible with the present direct hybrid design. A different approach is, therefore, needed to address all the issue...

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“…The finished device was a top-illuminated, longitudinal, 1 mm thick, 2 · 16 array with 800 lm pixel pitch and pixel-groove depth of about 90 lm. The readout we used is the 1 · 32 SBRC190 which is specifically designed for far IR photoconductors operating below 4 K. It was manufactured by Raytheon for SOFIA's AIRES instrument using a 0.8 lm cryo-CMOS process [22,23]. The unit cell is an active integrator with eight capacitors in the feedback loop which can be enabled sequentially to provide eight gain settings.…”

Section: The Focal-plane Arraymentioning

confidence: 99%