A digital readout IC for microbolometer imagers offering low power and improved self-heating compensation

Abbasi, Shahbaz and Shafique, Atia and Ceylan, Ömer and Gürbüz, Yaşar (2020) A digital readout IC for microbolometer imagers offering low power and improved self-heating compensation. IEEE Sensors Journal, 20 (2). pp. 909-917. ISSN 1530-437X (Print) 1558-1748 (Online)

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This paper presents a novel and power efficient readout architecture for uncooled microbolometers that offers adequate noise performance along with a circuit-based method for self-heating compensation. The proposed method employs an event-generation scheme and a time-mode readout chain to achieve dynamic mode of operation resulting in low power. The readout chain consists of a capacitive transimpedance amplifier (CTIA) based current-to-time converter followed by a two stage time-to-digital converter (TDC). The CTIA employs a novel integration scheme for time amplification along with a modified reset mechanism to achieve self-heating compensation. We also present a model to analyze the implications of time-mode readout on imager operation. An experimental readout chip, based on this approach, has been designed using a 130 nm bulk CMOS technology. The proposed architecture offers robust frontend processing and achieves a per channel power consumption of 66 mu W, which is considerably lower than the most recently reported designs, while maintaining better than 10-mK readout noise equivalent temperature difference (NETD).
Item Type: Article
Uncontrolled Keywords: Digital readout integrated circuit; uncooled microbolo meter; noise equivalent temperature difference (NETD); time-to-digital converter (TDC); self-heating
Divisions: Faculty of Engineering and Natural Sciences > Academic programs > Electronics
Faculty of Engineering and Natural Sciences
Depositing User: Yaşar Gürbüz
Date Deposited: 17 Sep 2020 21:52
Last Modified: 29 Jul 2023 16:14
URI: https://research.sabanciuniv.edu/id/eprint/40238

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