A Digital Readout IC for Microbolometer Imagers Offering Low Power and Improved Self-Heating Compensation
In: IEEE Sensors Journal, Jg. 20 (2020-01-15), S. 909-917
Online
unknown
Zugriff:
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 $66~\mu \text{W}$ , which is considerably lower than the most recently reported designs, while maintaining better than 10-mK readout noise equivalent temperature difference (NETD).
Titel: |
A Digital Readout IC for Microbolometer Imagers Offering Low Power and Improved Self-Heating Compensation
|
---|---|
Autor/in / Beteiligte Person: | Abbasi, Shahbaz ; Shafique, Atia ; Gurbuz, Yasar ; Ceylan, Omer |
Link: | |
Zeitschrift: | IEEE Sensors Journal, Jg. 20 (2020-01-15), S. 909-917 |
Veröffentlichung: | Institute of Electrical and Electronics Engineers (IEEE), 2020 |
Medientyp: | unknown |
ISSN: | 2379-9153 (print) ; 1530-437X (print) |
DOI: | 10.1109/jsen.2019.2944236 |
Schlagwort: |
|
Sonstiges: |
|