Design of a control circuit for a user reconfigurable ROIC for IRFPA applications

Abstract

PurposeThere are a lot of applications available for infrared focal plane array (IRFPA). Thus, advanced functions are required to support a wide range of IRFPAs applications. The purpose of this paper is to present a control circuit for a user reconfigurable 320×256 readout integrated circuit (ROIC) designed for IRFPA applications.Design/methodology/approachIn order to implement reconfigurable ROIC, several advanced functions can be realized by the control circuit such as global reset, capacitive transimpedance amplifier (CTIA) gain selectable, CTIA bandwidth selectable, random access opening (RAO), dynamic image transposition, selectable outputs, and adjustable power dissipation. These advanced functions can be implemented by loading corresponding control words into a 60‐bit control register. There are seven types of control words available with 14‐bit control words reserved for the realization of other functions in the future to control corresponding seven advanced functions.FindingsDesign and simulation of the control circuit based on CSMC 0.5 μm process technology have been conducted to confirm these functions. Based on these functions, wide scene dynamic range can be achieved, and the application of ROIC is more flexible.Originality/valueThis paper describes more functions such as CTIA bandwidth selectable, global reset, and also improved functions of RAO.