微测辐射热计阵列读出电路的单片集成设计

Design of Monolithic Integrated Readout Circuit for Micro-bolometer Array Applications

摘要:

微测辐射热计阵列读出电路的单芯片集成,有利于红外焦平面阵列的智能化和红外成像系统的便携化发展.提出了一种非致冷红外焦平面阵列读出电路,基于SMIC 0.18μm CMOS工艺,采用CTIA型单元读出电路结构,实现了偏置模块、驱动信号源模块、电流积分模块、相关双采样模块(CDS)和缓冲输出模块的单芯片集成,成功制造了1×8读出电路原型.仿真结果表明,设计的读出电路的线性度大于99%,功耗小于5mW,适合于大面阵移植.

Abstract:

Monolithic integration of readout circuit is conducive to the development of intelligent focal plane arrays and portability of infrared imaging systems.In this paper,a readout integrated circuit (ROIC) for uncooled infrared focal plane array (IRFPA) was presented,a prototype 1×8 monolithic integration of different functional modules,including biasing module,driving module,current integration module,correlated sampling module and buffer output module,using CTIA type element readout circuit structure was successfully fabricated through SMIC 0.18μm CMOS process.Simulation results show that the linearity and power dissipation of the designed readout circuit are 99% and 5mW,respectively,indicating good suitability for large array transplant applications.