Share Email Print

Proceedings Paper

High-performance 480x12x4 linear CMOS IR multiplexer
Author(s): Charles F. Walmsley; Timothy R. Beystrum; Charles Glasser; Ray Himoto; Mark K. Preis; Dave Parkinson
Format Member Price Non-Member Price
PDF $14.40 $18.00

Paper Abstract

This paper describes a linear CMOS IR multiplexer comprising four spectral bands, each with 480 channels of 12 TDI elements. The multiplexer is designed to interface with high R0A InSb detectors manufactured by Litton EOS, Tempe, AZ. The requirement to handle a wide range of photocurrents down to 100 fA, yet maintaining a signal bandwidth in excess of 2.5 kHz imposed significant demands on the input buffer amplifier design. In addition, each detector cell incorporates a sample/hold stage to allow snapshot operation mode. These features lead to a challenging layout for the 32 micrometers pitch to be met. To optimize dynamic range, each band may be independently operated with one of three gain settings set by switchable capacitors within the unit cell. Other architectural features of the array include bi- directional scanning, externally controllable integration time and electrical test. The array dissipates less than 50 mW of power and exhibits less than 65 noise electrons at high gain setting. A 0.7 micrometers silicon technology was used. Special design techniques were employed to allow operation at 7.5 V, thereby enhancing dynamic range. IR cameras incorporating the multiplexer are currently being delivered to the customer.

Paper Details

Date Published: 26 October 1999
PDF: 12 pages
Proc. SPIE 3794, Materials and Electronics for High-Speed and Infrared Detectors, (26 October 1999); doi: 10.1117/12.366738
Show Author Affiliations
Charles F. Walmsley, Walmsley Microelectronics Ltd. (United Kingdom)
Timothy R. Beystrum, Litton Electro-Optical Systems (United States)
Charles Glasser, Litton Electro-Optical Systems (United States)
Ray Himoto, Litton Electro-Optical Systems (United States)
Mark K. Preis, Litton Electro-Optical Systems (United States)
Dave Parkinson, Litton Electro-Optical Systems (United States)

Published in SPIE Proceedings Vol. 3794:
Materials and Electronics for High-Speed and Infrared Detectors
Walter F. Kailey; Stephen M. Goodnick; Randolph E. Longshore; Walter F. Kailey; Randolph E. Longshore; YongHang Zhang, Editor(s)

© SPIE. Terms of Use
Back to Top