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Title: Readout electronics for microbolometer infrared focal plane array
Keywords: Microbolometer, Self-heating cancellation, Readout integrated circuits, Infrared, fixed patter noise, Thermal imaging.
Issue Date: 20-Sep-2005
Citation: QIAN XINBO (2005-09-20). Readout electronics for microbolometer infrared focal plane array. ScholarBank@NUS Repository.
Abstract: Uncooled microbolometers suffer from the severe self-heating effect that will greatly affect the readout circuits. This project looks into a new self-heating cancellation technique and applies it to the readout integrated circuits (ROIC) for the microbolometer IR FPA. Such a cancellation scheme based on the equivalence between the electrical and thermal capacitance is presented and extended to current-mode ROICs. Both voltage- and current-mode self-heating cancellation circuits are realized in silicon and the effectiveness is demonstrated with a single microbolometer. The voltage- and current-mode ROICs with the proposed self-heating cancellation circuit have been developed with on-chip 8-bit fixed pattern noise (FPN) correction circuits. The test results have shown that the FPN can be corrected to a 7-bit resolution when exclude the pixels with unexpected large FPN, and an 8-bit resolution when tested with a built-in resistor array. The current-mode ROIC has the measured residual FPN of less than A?2.5 LSB.
Appears in Collections:Ph.D Theses (Open)

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