No abstract

Since the traditional digital readout circuits occupy a very large area, the array density of single photon avalanche detector (SPAD) is very low. The paper presents a high-density SP AD array by use of analog readout technique. Each SP AD pixel consists of a compact quenching and analog readout circuits, resulting into the significant improvement of pixel duty. More importantly, the presented analog readout mode can make use of CMOS-APS imaging device array architecture, which greatly enhances the pixel density. The analog readout signal of pixel is subsequently processed by multiplexer, correlated double sampling and analog-digital converter circuits, and finally digital signal is output. The proposed high density SP AD array could be used in high resolution imagers capable of imaging in low light level.

No abstract