Novel High Uniformity Readout Circuit Allowing Microbolometers to Operate with Low Noise
The capacitive transimpedance amplifier (CT1A) is usually taken as a preamplifier circuit for uncooled microbolometer due to its excellent bias control, high injection efficiency, linearity, and noise performance. However, the nonzero input offset voltage in the operational amplifier will cause a significant spatial non-uniformity. In this paper, we have developed a novel CTIA for uncooled microbolometers with correlated double sampling technique. The proposed CTIA suppresses the offset voltage and flicker noise of the op-amp. It improves the readout uniformity and also the temporal noise performance. A 320 × 240 uncooled microbolometer focal plane array based on the proposed circuit was implemented on silicon using a 0.5μm CMOS technology. A thermal IR image is, thus, obtained for F/l optics and at 60 Hz frame rate. The test spatial fixed pattern noise voltage and temporal root mean square (RMS) noise voltage are 0.0286 V, 546uV, respectively.
Jian Lv Yun Zhou Baobin Liao Yadong Jiang
State key Laboratory of Electronic Thin Film and Integrated Devices, University of Electronic Science and Technology of China, Chengdu 610054, China
国际会议
2011 IEEE 9th International Conference on ASIC(2011年第九届IEEE国际专用集成电路大会)
厦门
英文
674-677
2011-10-25（万方平台首次上网日期，不代表论文的发表时间）