Title :
Conversion time analysis of time domain digital pixel sensor in uniform and non-uniform quantizers
Author_Institution :
Dept. of EEE, HK Univ. of Sci. & Technol., Hong Kong, China
Abstract :
This paper analyzes the conversion time of a time domain digital pixel sensor based on pulse width modulation scheme. Two quantization schemes are studied namely the uniform time domain (UQ) and the non uniform time domain (NUQ) quantizers. It is shown that the latter scheme not only permits to linearize the non-linear response of a PWM vision sensor but also allows to significantly speed-up the conversion time particularly for wide dynamic range and lower coding resolution. The VLSI architecture of a reconfigurable DPS for variable spatial and coding resolutions is proposed in 1-poly, 5 metal CMOS 0.35μm n-well process.
Keywords :
CMOS image sensors; VLSI; pulse width modulation; quantisation (signal); time-domain analysis; 0.35 micron; CMOS process; PWM vision sensor; VLSI architecture; conversion time analysis; nonlinear response; nonuniform time domain quantizer; pulse width modulation; quantization scheme; reconfigurable DPS; time domain digital pixel sensor; Circuits; Dynamic range; Encoding; Energy consumption; Photoconductivity; Pulse width modulation; Quantization; Space vector pulse width modulation; Spatial resolution; Time domain analysis;
Conference_Titel :
System-on-Chip for Real-Time Applications, 2005. Proceedings. Fifth International Workshop on
Print_ISBN :
0-7695-2403-6
DOI :
10.1109/IWSOC.2005.47
