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红外单光子探测因其超高的检测灵敏度和信噪比,有效提升了弱光检测系统的性能水平。基于TSMC 0.35μm CMOS工艺,提出了一种阵列型数字式红外读出电路及其应用系统的设计方法。采用由OSC多相时钟构成的低段全局共享TDC和高段像素独享TDC的两段式阵列结构,在170 MHz时钟频率下,实测获得了小于1 ns的时间分辨率和3μs的量程,并在1 k Hz的帧率下采用串行模式输出数据,经相关数据处理,最终实现测距轮廓成像的功能。
Infrared single-photon detection because of its high detection sensitivity and signal-to-noise ratio, effectively enhance the low light detection system performance level. Based on the TSMC 0.35μm CMOS process, an array type digital infrared readout circuit and its application system design method are proposed. Using a two-segment array structure of low-level global shared TDC and high-segment pixel-exclusive TDC consisting of OSC multiphase clocks, the time resolution of less than 1 ns and the range of 3 μs were obtained under the condition of 170 MHz clock frequency In the 1 k Hz frame rate using serial mode output data, the relevant data processing, the ultimate realization of ranging contour imaging function.