Dynamic resistance nonuniformity compensation circuit for uncooled microbolometer detector arrays

Yildirim, Omer Ozgur
Akın, Tayfun
This paper presents a new approach for compensating resistance nonuniformity of uncooled microbolometers by adjusting the bias currents of both detector and reference pixels. Contrary to conventional nonuniformity compensation circuits, this approach eliminates the need for digital-to-analog converters (DACs), which usually occupy a large area, dissipate high power, and require complicated external circuitry with high frequency data transfer to the microbolometer chip. The proposed circuit uses a feedback structure that dynamically changes the bias currents of the reference and detector pixels and does not need complicated external circuitry. A special feature of the circuit is that it provides continuous compensation for the detector and reference resistances due to temperature changes over time. The circuit is implemented in a 0.6 mu m 5V CMOS process and occupies an area of only 160 mu m x 630 mu m. Test results of the prototype circuit show that the circuit reduces the offset current due to resistance nonuniformity about 2.35% of its uncompensated value, i.e., an improvement of about 42.5 times is achieved, independent of the nonuniformity amount. The circuit achieves this compensation in 12 mu sec. Considering its simplicity and low cost, this approach is suitable for large array commercial infrared imaging systems.


Resistance non-uniformity correction method using bias heating for resistance type uncooled microbolometer FPAs
Tepegoz, Murat; Akın, Tayfun (2007-04-13)
This paper proposes a new resistance non-uniformity correction method for microbolometer-type uncooled thermal detector focal plane arrays (FPAs) that suffer from pixel-to-pixel resistance variation, which is conventionally corrected by applying a specific bias voltage to each detector by the use on-chip DACs. The proposed method uses the heating of the detector with electrical bias, where the detector is heated-up for a pre-determined period of time before the read-out phase. The proposed method uses only ...
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...
Compensation of Temperature and Acceleration effects on MEMS Gyroscope
Ali, Muhammad (2016-01-16)
This paper shows temperature and acceleration effects on Micro-Electro-Mechanical-Systems (MEMS) gyroscope and a practical solution is presented to mitigate effect of these errors using different methods (Polynomial Curve fitting and Neural Networks). Compensation is performed on the output bias drift data acquired from different MEMS gyroscopes. Performance of compensation techniques is also presented in this study. This paper presents novelty of integrated compensation for both factors (temperature and ac...
An Uncooled Microbolometer Focal Plane Array Using Heating Based Resistance Nonuniformity Compensation
Tepegoz, Murat; Oguz, Alp; Toprak, Alperen; Senveli, S. Ufuk; Canga, Eren; Tanrikulu, M. Yusuf; Akın, Tayfun (2012-04-27)
This paper presents the performance evaluation of a unique method called heating based resistance nonuniformity compensation (HB-RNUC). The HB-RNUC method utilizes a configurable bias heating duration for each pixel in order to minimize the readout integrated circuit (ROIC) output voltage distribution range. The outputs of each individual pixel in a resistive type microbolometer differ from each other by a certain amount due to the resistance non-uniformity throughout the focal plane array (FPA), which is a...
Dynamic analysis of CMUTs in different regimes of operation
Bayram, Barış; Ergun, AS; Yaralioglu, GG; Khuri-Yakub, BT (2003-01-01)
This paper reports on dynamic analysis of an immersed single capacitive micromachined ultrasonic transducer (CMUT) cell transmitting. A water loaded 24 mum circular silicon membrane of a transducer was modeled. The calculated collapse and snapback voltages were 80 V and 50 V, respectively. The resonance frequency, output pressure and nonlinearity of the CMUT in three regimes of operation were determined. These regimes were: a) the conventional regime in which the membrane does not make contact with the subs...
Citation Formats
O. O. Yildirim and T. Akın, “Dynamic resistance nonuniformity compensation circuit for uncooled microbolometer detector arrays,” 2006, vol. 6206, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/35286.