A column-based two-stage analog-to-digital converter for uncooled microbolometer arrays
Proceedings of SPIE(2009)
摘要
This paper presents a column-based, two-stage, 12-bit analog-to-digital converter structure designed for uncooled
microbolometer arrays. On-chip analog-to-digital converters prevent the degradation of sensitive analog output by
external noise sources as well as providing a more integrated functionality. Despite these advantages, the area and power
constraints limit the usage of high performance converters. This paper presents a new structure that provides a balance
between area, power, and performance. The structure is composed of two stages: a tracking ADC stage running at each
column during integration and a successive approximation ADC stage which is shared by a number of columns
depending on the array size and operation frequency. The tracking ADC operates during the integration time, while the
second ADC starts after the integration is completed. The converter includes self-calibration to lower the effect of
process variations and digital correction mechanisms to eliminate the need for low-offset comparators. The simulations
and theoretical calculations based on the simulation results show that the total power dissipation of the proposed
structure will be approximately 73.7 mW and 88.4 mW on a 320x240 array operating at 60 Hz and 384x288 array
operating at 50 Hz, respectively.
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关键词
calibration,process variation,chip
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