边积分边读出低噪声红外焦平面读出电路研究

摘要

InGaAs shortwave infrared focal plane array (FPA) has important application in space remote sensing. In this paper, a new design of readout integrated circuit ( ROIC) is presented for a low-noise InGaAs FPA. In order to promote the signal-to-noise ratio, a new correlated double sampling (CDS) circuit is presented for eliminating KTC noise of integration capacitor (0.15 pF) in mode of integration while read. The circuit has been fabricated with 0. 5 μm 5 V N-well CMOS process. Test results show that ROIC noise is 1.7μ10-4 V and dynamic range is above 80 dB, working well after interfaced with InGaAs detectors.%设计了一款低噪声InGaAs焦平面读出电路.提出一种新型相关双采样电路结构,可在边积分边读出模式下有效抑制积分电容(0.15 pF)的KTC噪声.电路经0.5 μn5 V Nwell CMOS工艺流片,测试结果符合设计目标,在高帧频边积分边读出模式下工作状态良好,电路噪声约1.7×10-4V,动态范围大于80 dB.