Readout integrated circuit for microbolometer with an analog non-uniformity correction

C. H. Hwang; D. H. Woo; Y. S. Lee; H. C. Lee

doi:10.1117/12.630755

11 October 2005 Readout integrated circuit for microbolometer with an analog non-uniformity correction

C. H. Hwang, D. H. Woo, Y. S. Lee, H. C. Lee

Proceedings Volume 5987, Electro-Optical and Infrared Systems: Technology and Applications II; 59870P (2005) https://doi.org/10.1117/12.630755
Event: European Symposium on Optics and Photonics for Defence and Security, 2005, Bruges, Belgium

Abstract

We have developed a microbolometer readout integrated circuit (ROIC) that corrects the non-uniformity in analog operation and acts in both normal mode and edge detection mode. A capacitive transimpedance amplifier (CTIA) has been employed as the input circuit of the microbolometer. Generally, when fabricating microbolometer focal plane arrays (FPAs), offset-error and gain-error in the inter-microbolometer are induced by fabrication error. They are shown as fixed pattern noise (FPN) in the infrared image. In the present study, a circuit correcting the offset-error and the gain-error in the normal mode by controlling the bias and the integration capacitance of the CTIA is proposed. This circuit does not require an additional DSP chip, and the non-uniformity is corrected before the analog to digital conversion (ADC). Thus, it can utilize 3-4 bits lower ADC compared to the conventional readout circuit. In the edge detection mode, after correcting the gain-error in two adjacent pixels, edge detection can be realized by subtracting their signal without the DSP. We have designed the suggested circuit to output a 10bit level effective infrared signal using 0.35um 2-poly 3-metal CMOS technology.

Citation Download Citation

C. H. Hwang, D. H. Woo, Y. S. Lee, and H. C. Lee "Readout integrated circuit for microbolometer with an analog non-uniformity correction", Proc. SPIE 5987, Electro-Optical and Infrared Systems: Technology and Applications II, 59870P (11 October 2005); https://doi.org/10.1117/12.630755

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