用于微悬臂梁红外焦平面读出电路的片上ADC设计(英文)

Design of On-Chip ADC for Readout Circuit of Microcantilever-Based Infrared Focal Plane Array

设计了一种用于微悬臂梁红外焦平面读出电路的片上ADC。该ADC采用流水线结构实现,采用带溢出检测的多位第一级和后级功耗逐级缩减的方案优化系统功耗,提高线性度。该设计采用0.35μm的CMOS工艺流片验证。测试结果表明:5V电源电压、10M采样率时电路总功耗为98mW,微分非线性和积分非线性分别为-0.8/0.836LSB和-0.9/1.6LSB;输入频率为1MHz时,SFDR和SNDR分别为82和67dB。

An on-chip ADC for readout circuit （ROIC） of microcantilever-based infrared focal plane array （IRFPA） is presented. Pipeline structure is employed for power and area efficiency. Multi-bit first stage with overflow detection and stage scaling down are adopted to optimize the power dissipation of ADC. The prototype ADC is fabricated in 0. 35 μm CMOS process. Measurement results show that the power dissipation is 98 mW from a 5 V supply, DNL and INL is - 0.8/ 0. 836 LSB and -0. 9/1.6 LSB, respectively. With a 1 MHz input signal, the ADC achieves 82dB SFDR and 67 dB SNDR at 10 M samples/s.