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Proceedings Paper

Sigma-delta column-wise A/D conversion for cooled ROIC
Author(s): F. Guellec; P. Villard; F. Rothan; L. Alacoque; C. Chancel; P. Martin; P. Castelein; P. Maillart; F. Pistone; P. Costa
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Paper Abstract

Designing a digital IR focal plane array (IRFPA) requires fulfilling very stringent requirements in terms of power consumption, silicon area and speed. Among the various ADC architectures like successive approximation, ramp or over-sampled converters, the best choice strongly depends on the application. We believe that sigma-delta converters, in spite of their quite high power consumption, are a promising solution for high-performance and medium size FPA, e.g. 320x240. This paper presents the design of a second-order incremental sigma-delta ADC dedicated to cooled (77K) IRFPA applications. System-level simulations used to define the modulator parameters and specify its analog building blocks are presented. Circuit design of the switched-capacitor modulator and the digital decimation filter is described. The column ADC including the filter has been implemented in a standard 0.35μm CMOS process on the basis of a 25μm pitch and lead to a total length of 3200μm. Test chips including a single ADC have been manufactured end of 2006. The first measurement results, at 77K, are presented along with perspectives and future developments. They demonstrate the following performance: 81dB Signal-to-Noise Ratio (SNR), 13 bits Effective Number Of Bits (ENOB) and 270μW power consumption at 17kSamples/s rate.

Paper Details

Date Published: 14 May 2007
PDF: 9 pages
Proc. SPIE 6542, Infrared Technology and Applications XXXIII, 65423N (14 May 2007); doi: 10.1117/12.719171
Show Author Affiliations
F. Guellec, CEA/LETI – MINATEC (France)
P. Villard, CEA/LETI – MINATEC (France)
F. Rothan, CEA/LETI – MINATEC (France)
L. Alacoque, CEA/LETI – MINATEC (France)
C. Chancel, CEA/LETI – MINATEC (France)
P. Martin, CEA/LETI – MINATEC (France)
P. Castelein, CEA/LETI – MINATEC (France)
P. Maillart, SOFRADIR (France)
F. Pistone, SOFRADIR (France)
P. Costa, SOFRADIR (France)

Published in SPIE Proceedings Vol. 6542:
Infrared Technology and Applications XXXIII
Bjørn F. Andresen; Gabor F. Fulop; Paul R. Norton, Editor(s)

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