读出电路开窗技术研究

读出电路开窗是红外焦平面和图像传感器读出电路中,用于提高图像帧频降低带宽的重要技术。该技术通过减小读出阵列的窗口尺寸,降低电路读出的数据量,从而提高帧频。介绍了两类主要的开窗模式:异步读出模式和同步读出模式。针对异步读出模式扩展性差、存在竞争冒险的问题,以及同步读出模式占用像元面积和窗口切换速度慢的问题,基于同步读出提出了一种行列控制字架构,并设计了一种用于该架构的可重复单元电路,提高了对不同面阵规格的扩展性。完成了所提出的开窗电路设计和版图设计,并对该电路进行了仿真验证。对比其他方案,文中设计实现了任意位置、最小1×1尺寸的开窗,同时解决了占用像元面积和竞争冒险问题,并提高了窗口切换速度。

Research on ROI readout technology of ROIC

Region of interest (ROI) readout is an important technology used in the infrared focal plane array(IRFPA) and image sensor readout integrated circuits to improve the frame rate and reduce the bandwidth, which is realized by the reduced ROI size and the readout data volume. Two ROI readout modes including asynchronous readout and synchronous readout are introduced in this paper. The asynchronous readout mode exhibits poor scalability and the problem of the competitive risk, while the synchronous readout mode occupies pixel area and the ROI switching speed is slow. To solve these problems, this paper proposes a row-column control word architecture based on synchronous readout mode, and a reusable unit circuit is designed to improve the scalability for various array size. The circuits and layout for the proposed architecture are designed, which are verified by circuit simulation. Compared with other architectures, the proposal realizes ROI readout at arbitrary position with minimum size of 1×1. Moreover, problems including the occupying of pixel area and competitive risk are solved, as well as the ROI switching speed.