A low power readout circuit approach for uncooled resistive microbolometer FPAs

Date

2008-03-20

Author

Tepegoz, Murat
Toprak, Alperen
Akın, Tayfun

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

227
views

0
downloads

This paper presents a new, low power readout circuit approach for uncooled resistive microbolometer FPAs. The readout circuits of the microbolometer detectors contain parallel readout channels whose outputs are driven and multiplexed on large bus capacitances in order to form the output of the readout circuit. High number of opamps used in the readout channel array and large output capacitances that these opamps should drive necessitates the use of high output current capacity structures, which results in large power dissipation. This paper proposes two new methods in order to decrease the power dissipation of the readout circuits for uncooled thermal FPAs. The first method is called the readout channel group concept, where the readout channel array is separated into groups in order to decrease the load capacitance seen by the readout channel output. The second method utilizes a special opamp architecture where the output current driving capacity can be digitally controlled. This method enables efficient use of power by activating the high output current driving capacity only during the output multiplexing. The simulations show that using these methods results in a power dissipation reduction of 80% and 91% for the readout channels optimized for a single output 384x288 FPA operating at 25 fps and for a two-output 640x480 FPA operating at 30 fps, respectively.

Subject Keywords

RCG, Readout channel group, Low power readout circuit, uncooled resistive microbolometer readout circuit

URI

https://hdl.handle.net/11511/47508

DOI

https://doi.org/10.1117/12.786609

Collections

Department of Electrical and Electronics Engineering, Conference / Seminar

Suggestions

OpenMETU
Core

A current mirroring integration based readout circuit for high performance infrared FPA applications Külah, Haluk; Akın, Tayfun (2003-04-01) This paper reports a current mirroring integration (CMI) CMOS readout circuit for high-resolution infrared focal plane array (FPA) applications. The circuit uses a feedback structure with current mirrors to provide stable bias voltage across the photodetector diode, while mirroring the diode current to an integration capacitor. The integration capacitor can be placed outside of the unit pixel, reducing the pixel area and allowing to integrate the current on larger capacitance for larger charge storage capac...
A CMOS n-well microbolometer FPA with temperature coefficient enhancement circuitry Eminoglu, S; Tezcan, DS; Akın, Tayfun (2001-04-20) This paper reports the development of a low-cost CMOS microbolometer focal plane array with a new temperature coefficient enhancement readout circuit. We have recently reported an uncooled microbolometer detector that uses the CMOS n-well layer as the active material, where the suspended and thermally isolated n-well structure is obtained by silicon bulk micromachining of fabricated CMOS dies. In addition, we have successfully fabricated a 16x16 n-well microbolometer FPA. Although n-well is single crystal s...
A Two-Stage Digital-to-Analog Converter for Bias Correction in Uncooled Microbolometer Arrays Toprak, Alperen; Tepegoz, Murat; Akın, Tayfun (2011-04-29) This paper introduces a detector biasing scheme proper for resistive microbolometer type uncooled thermal detector focal plane arrays (FPAs). The proposed scheme utilizes a 2-stage digital-to-analog converter (DAC) architecture where the first DAC stage generates the voltage interval that covers the bias voltage range of the overall FPA, while the second stage generates the high resolution analog voltages that are used to apply pixel-specific bias voltages. The second DAC stage output includes a resistive l...
A low-cost 128x128 uncooled infrared detector array in CMOS process Eminoglu, Selim; Tanrikulu, Mahmud Yusuf; Akın, Tayfun (2008-02-01) This paper discusses the implementation of a low-cost 128 x 128 uncooled infrared microbolometer detector array together with its integrated readout circuit (ROC) using a standard 0.35 mu m n-well CMOS and post-CMOS MEMS processes. The detector array can be created with simple bulk-micromachining processes after the CMOS fabrication, without the need for any complicated lithography or deposition steps. The array detectors are based on suspended p(+)-active/n-well diode microbolometers with a pixel size of 4...
An adaptive piezoelectric energy harvesting interface circuit with a novel peak detector Chamanian, S.; Zorlu, O.; Külah, Haluk; Muhtaroglu, A. (2015-03-26) This paper presents a fully self-powered interface circuit with a novel peak detector for piezoelectric energy harvesters (PEH). This circuit can be utilized to scavenge energy from low power environmental vibrations in 10s of mu W range. Synchronous switching technique is used to extract maximum available power where switching instants are detected independently from excitation changes of the PEH. The proposed peak detector senses voltages higher than power supply for a wide frequency range of input vibrat...

Citation Formats

M. Tepegoz, A. Toprak, and T. Akın, “A low power readout circuit approach for uncooled resistive microbolometer FPAs,” 2008, vol. 6940, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/47508.