320×256红外焦平面阵列读出电路的设计

Design for 320×256 IRFPA Readout Circuit

提出了一种320×256红外焦平面阵列读出电路的原理及电路设计,采用直接注入的单元电路,在给定的单元面积内可以获得较大的积分电容。相关的320×256阵列读出电路已经在0.5μm双层多晶三层铝N阱CMOS工艺线上实现,整体芯片的面积为9.0 mm×11.2 mm。实测结果表明芯片在常温和低温77 K时都工作正常,工作频率大于5 MHz,整电路的功耗为48 mW左右,动态范围是75 dB,噪声电压为0.5 mV。

The operation principle and the circuit design of 320×256 Infrared Focal Plane Array（IRFPA） readout Circuit is presented in this paper.The pixel cell uses the direct injection structure to attain a large integration capacitor.The designed readout circuit has been fabricated with a standard 0.5 μm Double Poly Triple Metal（DPTM） n-well CMOS process.The whole chip area is 9.0 mm×11.2 mm.The measurement results show that the readout chip works well at both room temperature and 77 K.The working frequency is beyond 5 MHz and the active power dissipation of about 48 mW.The dynamic range is 75 dB and the noise voltage is 0.5 mV.