A n approach t o t h e design of high-frequency monolithic voltage-controlled oscillators using operational transconductance amplifiers a n d capacitors is given. Results from two 3 p m C M O S prototypes are presented. B o t h frequency a n d amplitude of t h e oscillations can be t u n e d by means of control voltages. Programmable oscillator frequencies u p to 56.1Mhz a r e obtained, t h e amplitudes being adjustable between 1 v peak-to-peak a n d 100mv peak-to-peak. Total Harmonic Distortions from 2.8% down to 0.2% have been experimentally measured in t h e laboratory.
This paper describes the use of a reconfigurable focal-plane processing array in order to achieve an image representation which dramatically reduces the computational load of the Viola-Jones object detection framework. Additionally, such representation provides richer information than the simple sum of pixels within rectangular regions originally defined in this framework. As a result, more elaborated features could be devised to speed up the execution of the subsequent attentional cascade, boosting thus the performance of the whole algorithm. The proposed circuitry has been successfully implemented in a CMOS prototype smart imager. Experimental results are given, demonstrating the suitability of the approach presented to efficiently deliver enriched Viola-Jones features.
This paper presents an asynchronous mixed-signal WTA-LTA circuit conceived to carry out local minimummaximum indexing in massively parallel image processing arrays. The hardware is focused on energy-efficient operation. We describe a realization for the standard CMOS base process of a commercial 3-D TSV stack featuring a power consumption of only 20pW per elementary cell at 30fps. The proposed block is also capable of resolving small voltage differences without requiring any external reference. This leads to a hit percentage greater than 90% even when taking into account global process variations and mismatch conditions.
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