【摘要】 快照模式焦平面读出电路的单元电路一般包括前置放大器、采样保持电路、多路开关传输器和缓冲跟随器。在有限的单元面积内完成较高性能的单元电路设计是快照模式焦平面读出电路的难点。考虑到积分电容、采样保持电容、运放补偿电容占据了CMOS电路版图中较多的面积,通过分析计算读出电路各级噪声以及电路总的输出噪声,探讨了上述各种电容对于电路噪声的影响。考虑到紫外探测器的特点,同时在固定其他设计参数的基础上,通过调整电容面积的分配比例,计算了电路可以得到最佳噪声水平的电容大小。结果表明,在目前的工艺和版图限制等条件下,在上述三种电容分别取1.1、0.4、1.2 pF时,输出端噪声电压为最小,达172μV。更多还原

【Abstract】 Design of the pixel circuit of the Readout Integrated Circuit(ROIC) for snapshot Ultraviolet Focal Plane Array(UV FPA),while including a preamplifier,a sample/hold circuit,a multiplexer switch and a buffering follower,is always a challenge for higher performance in a limited layout area.The capacitors,such as an integration capacitor,sample/hold capacitor,and compensation capacitor in Op-amp,take up a lot of space in CMOS layout.In this paper,the noise of each stage in the ROIC was analyzed,and then the total output noise voltage was calculated.Based on the relation between output noise voltage and capacitors,the optimized capacitor ratio in ROIC was found so as to achieve the lowest noise level.It is shown that when the values of capacitors are selected as 1.1,0.4,1.2 pF respectively,the total output noise reached its minimum of 172 μV.更多还原