Title :
A CMOS binary position-sensitive photodetector (PSD) array
Author :
Mäkynen, Anssi ; Rahkonen, Timo ; Kostamovaara, Juha
Author_Institution :
Dept. of Electr. Eng., Oulu Univ., Finland
Abstract :
Implementation and test results of a 16 by 16 binary CMOS photodetector array for position sensing applications is presented. Unlike conventional position sensitive detectors (PSDs), it is capable of simultaneous multiple spot detection with high accuracy. To decrease signal processing overhead characteristic of this kind of area arrays, binary detection with on-site thresholding and random access readout is used. The fill factor and pitch of the array are 30% and 50 μm, respectively. Quantization limited position sensing accuracy of 4.3 μm is achieved using spot of a 280 μm in diameter, total signal power of about 8 nW and pulse width of 8 ms. The sensitivity is limited by the spatial noise caused by the mismatch of threshold setting current mirrors operating in weak inversion
Keywords :
CMOS integrated circuits; mixed analogue-digital integrated circuits; optical sensors; optical signal detection; photodetectors; photodiodes; position measurement; 8 nW; CMOS photodetector array; area arrays; binary detection; fill factor; on-site thresholding; photodiode array; position sensing applications; position-sensitive photodetector array; quantization limited position sensing; random access readout; sensitivity; signal processing; simultaneous multiple spot detection; spatial noise; threshold setting current mirrors; weak inversion operation; Array signal processing; Circuits; Lighting; Optical noise; Optical sensors; Optical signal processing; Photodetectors; Position sensitive particle detectors; Sensor arrays; Testing;
Conference_Titel :
Custom Integrated Circuits Conference, 1997., Proceedings of the IEEE 1997
Conference_Location :
Santa Clara, CA
Print_ISBN :
0-7803-3669-0
DOI :
10.1109/CICC.1997.606630
