In this paper, a polyvinylidene fluoride (PVDF) piezoelectric transducer was developed to detect laser-induced surface acoustic waves in a SiO(2)-thin film-Si-substrate structure. In order to solve the problems related to, firstly, the position of the probe, and secondly, the fact that signals at different points cannot be detected simultaneously during the detection process, a four-quadrant su...

 1971-73 Technical Officer I, Electronic Corporation of India Limited, India. Responsible for the board-level design of nonlinear functions used in analog computers. Contributed to discrete transistor implementations of operational amplifiers. Developed a folding technique (with digital logic) for multipliers that results in a more compact implementation. Recently (1999) applied for a provisio...

In this paper we present a new process to measure the jitter of a telecommunication system. To understand better the new proposed technique we show others classical measurer systems. The obtained results are coherent with the well known theoretical formula of the analog PLL based on an ideal multiplier and also with the practical results obtained experimentally.

A CCO based signal processing IC that computes a fully parallel single quadrant vector-matrix multiplication has been designed and fabricated with a 2j..un CCO/CMOS process. The device incorporates an array of Charge Coupled Devices (CCO) which hold an analog matrix of charge encoding the matrix elements. Input vectors are digital with 1 8 bit accuracy.

We propose a four-quadrant propeller model suitable for energy-efficient motion planning of autonomous marine vehicles. The model can be used to capture the main features of experimental thrust and torque curves by using a small number of parameters. We explore the connection between the propeller thrust, torque, and efficiency curves and the lift and drag curves of the propeller blades. The mo...

Of the many novel coronagraphic and nulling techniques that have been suggested to improve image contrast for exoplanet detection, one of the most promising is the Quadrant Phase Mask suggested by Rouan et al.. Analysis of this optical system has previously been performed by discrete Fourier transform methods, that result in systematic errors due to the implicit assumptions of the methods and m...

This paper provides a technical review of position and speed sensor less methods for controlling brushless direct current (BLDC) motor drives, including the background analysis using sensors, limitations and advances. The performance and reliability of BLDC motor drivers have been improved because the conventional control and sensing techniques have been improved through sensor less technology....

This paper examines a variety of issues relating to the analog hardware implementation of the soft competitive neural learning algorithm and its suitability for use in data compression applications. Specifically, we investigate the impact of realizing the theoretical learning algorithm in imperfect analog structures constructed in a traditional CMOS fabrication process. Empirical measurements o...