CDS With Adjustable Interval for Low Noise Hyperspectral Infrared Focal Plane Readout circuits

Abstract

Low noise is a key requirement of Readout Integrated Circuit (ROIC) in hyperspectral application for its low radiation. The Correlated Double Sampling (CDS) technology is commonly used to suppress the effect of noise. In this paper, CDS is improved by adjusting the time interval between the clamp and sample hold (SH), which can filter low frequency noise flexibly. A ROIC input stage integrated with low-noise Capacitive trans-impedance amplifiers (CTIA) and CDS with adjustable interval (AICDS) is designed. The SPECTRE simulation indicates that, by extending the CDS reset time, the simulation result is consistent with the analysis. The number of noise electrons reaches 32.59 e-, which is better than 56.7 e- without extending the reset time. The design of AICDS can improve the noise performance of hyperspectral ROIC, and can be widely used.