11 November 2014 A new architecture of high dynamic range readout circuits for IR FPA
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Abstract
The high-speed and high dynamic range readout circuits can realize a good performance that achieving intra-scene wide dynamic range,and the readout circuits could get more details of a target view that include very dark and very bright signal. A new architecture of readout circuits with high speed and high dynamic range is introduced. In order to achieve high dynamic range, we use a special architecture of readout circuits. The circuits allow the very high signal to input, and output the signal without damaging. The input stage use a CTIA architecture in the circuits, and connect a feedback circuit and a S/H circuit in the output of CTIA. The architecture of the feedback is a circuit to control the reset switch of CTIA, when a strong signal inputing, the feedback circuit judge the signal of output, if the signal over the reference signal that have been set, the feedback circuit output a reset signal, the output of CTIA is reset to the initial state. A counter records the reset signal, and get the total times of reset. At the last stage of integration period,the S/H circuit samples the signal and a integration period is over. As the circuits could realize multiple reset, the signal would never reach saturation state, and it can achieve a very high range in the output. We use the GLOBALFOUNDRIES 0.35μm technology and simulate the designed circuits with Cadence IC, and test the functions, then analyze the performance of the circuits from the results.
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Dazhao Jiang, Qinghua Liang, Ruijun Ding, "A new architecture of high dynamic range readout circuits for IR FPA", Proc. SPIE 9275, Infrared, Millimeter-Wave, and Terahertz Technologies III, 92750M (11 November 2014); doi: 10.1117/12.2071396; https://doi.org/10.1117/12.2071396
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