Title :
A digital pixel image sensor for real-time readout
Author :
Andoh, Fumihiko ; Shimamoto, Hiroshi ; Fujita, Yoshihiro
Author_Institution :
NHK Sci. & Tech. Res. Labs., Tokyo, Japan
fDate :
11/1/2000 12:00:00 AM
Abstract :
An experimental digital image sensor that converts analog video signals into 8-bit digital signals for each unit pixel, and reads out the signals at an operating clock of standard TV has been developed. Each pixel is equipped with a photodiode, a 1-bit analog-to-digital converter (1-bit ADC), an 8-bit pulse counter, and a signal processing circuit. The sensor system displays a two-dimensional (2-D) image in real time. The 1-bit ADC has a dynamic range of 110 dB at an operating voltage of 1.3 V. “Knee” characteristics and the results of an investigation into random noise sources in the circuit are also described
Keywords :
analogue-digital conversion; counting circuits; image sensors; random noise; readout electronics; 1.3 V; 2D image; 8 bit; analog video signals; analog-to-digital converter; digital pixel image sensor; knee characteristics; operating clock; operating voltage; pulse counter; random noise sources; real-time readout; signal processing circuit; standard TV; Circuits; Clocks; Digital images; Image converters; Image sensors; Photodiodes; Pixel; Standards development; TV; Two dimensional displays;
Journal_Title :
Electron Devices, IEEE Transactions on
