Zhongjie Guo, Ningmei Yu, Longsheng Wu. Column readout circuit with improved offset mismatch and charge sharing for CMOS image sensor[J]. Journal of Semiconductors, 2019, 40(12): 122404
- Journal of Semiconductors
- Vol. 40, Issue 12, 122404 (2019)
Fig. 1. Column readout with two buffers.
Fig. 2. Column readout with single buffer.
Fig. 3. (a) Proposed column readout. (b) Control timing of the proposed circuit.
Fig. 4. (a) Reset level sample phase. (b) Image level sample phase. (c) Reset level buffer phase. (d) Image level buffer phase.
Fig. 5. n columns readout schematic.
Fig. 6. Control timing of n columns readout.
Fig. 7. (Color online) Die micrograph.
Fig. 8. Output code and nonuniformity versus exposure time.
Fig. 9. Comparison of actual images before and after optimization. (a) Image with traditional technique. (b) Image with proposed technique.
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Table 1. Performance summary and comparison with the state of the art.
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