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Proceedings Paper

Novel concept of TDI readout circuit for LWIR detector
Author(s): Byunghyuck Kim; Nanyoung Yoon; Hee Chul Lee; Choong-Ki Kim
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Paper Abstract

Noise property is the prime consideration in readout circuit design. The output noise caused by the photon noise, which dominates total noise in BLIP detectors, is limited by the integration time that an element looks at a specific point in the scene. Large integration time leads to a low noise performance. Time-delay integration (TDI) is used to effectively increase the integration time and reduce the photon noise. However, it increases the number of dead pixels and requires large integration capacitors and low noise output stage of the readout circuit. In this paper, to solve these problems, we propose a new concept of readout circuit, which performs background suppression, cell-to-cell background current non-uniformity compensation, and dead pixel correction using memory, ADC, DAC, and current copier cell. In simulation results, comparing with the conventional TDI readout circuit, the integration capacitor size can be reduced to 1/5 and trans-impedance gain can be increased by five times. Therefore, the new TDI readout circuit does not require large area and low noise output stage. And the error of skimming current is less than 2%, and the fixed pattern noise induced by cell-to-cell background current variation is reduced to less than 1%.

Paper Details

Date Published: 17 July 2000
PDF: 7 pages
Proc. SPIE 4028, Infrared Detectors and Focal Plane Arrays VI, (17 July 2000); doi: 10.1117/12.391729
Show Author Affiliations
Byunghyuck Kim, Korea Advanced Institute of Science and Technology (South Korea)
Nanyoung Yoon, Korea Advanced Institute of Science and Technology (South Korea)
Hee Chul Lee, Korea Advanced Institute of Science and Technology (South Korea)
Choong-Ki Kim, Korea Advanced Institute of Science and Technology (South Korea)


Published in SPIE Proceedings Vol. 4028:
Infrared Detectors and Focal Plane Arrays VI
Eustace L. Dereniak; Robert E. Sampson, Editor(s)

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