Pratik Damle

Abstract: An efficient methodology for minimizing core supply noise in Power Delivery Networks is presented. To reduce the power supply noise, an optimal decoupling network is designed by Simulated Annealing. The cumulative impedance of Power Delivery Network is reduced using lesser number of decoupling capacitors compared to placing decoupling capacitors intuitively. The supply noise is minimized according to the requirement of system specifications and the corresponding jitter reduction is reported.

Abstract: A genetic algorithm (GA)-based method is proposed for simultaneous optimization of decoupling capacitors assigned to multiple pins of a ball-grid array (BGA) package on a printed circuit board. A noise susceptibility parameter is introduced as the basis of a new set of GA fitness functions. Performance of several fitness functions is comparatively tested and discussed in case studies. The accuracy of the developed expressions is tested against full-wave electromagnetic simulation results. The proposed method is particularly useful for predicting the number and placement of decoupling capacitors under the BGA area of integrated circuit devices in early design stages and serves as a complement to rigorous algorithms that are used in the final phase of the design.

Abstract: Jatropha curcas is an important commodity for farmers. The farmers must be aware of the disease caused by pest or virus for the existence and benefits of this plant. The main obstacle is the lack of farmers' knowledge about diseases and a system that utilize plant expert knowledge is needed. This paper proposes Fuzzy Neural Network (FNN) method to identify Jatropha Curcas Disease. To achieve higher accuracy, simulated annealing (SA) is employed to adjust the boundary of membership functions of the FNN. Computational experiments prove that the proposed method produces promising result and the SA is effective to improve the accuracy of the FNS.

Abstract: A multiobjective evolutionary method is proposed for the optimization of surface mount device (SMD) multilayer ceramic chip (MLCC) capacitors used for decoupling on printed circuit boards (PCBs) with resonant power–ground plane pairs. The proposed approach provides options for designers to meet power integrity specifications by employing uniform-valued capacitors that help to reduce the bill-of-material (BOM) cost and mitigate the part procurement risk. It is also shown that uniform MLCC capacitors with variable distance from power pins can have a similar decoupling effect to an assortment of capacitors. By simultaneously optimizing the pin-capacitor distance and value, the proposed method is shown to allow for the allocation of fewer decoupling capacitors under the ball-grid-array (BGA) pin field of an integrated circuit (IC) device.

Abstract: The switch mode power supply (SMPS) have been widely used in the electrical and electronics systems for AC-DC and DC-DC power conversion, which can generate a lot of electromagnetic interference (EMI), especially conducted emission (CE) from 9kHz to 30MHz. The traditional CE models and mechanisms have been present for three line systems, including live, neutral and ground lines, while a novel CE models and mechanisms have been proposed in the paper for two line SMPS. And the voltage division factor, isolation factor and impedance under SMPS side of artificial mains network have been studied based on high frequency parasitic parameters to analyze the CE measurement uncertainty. Moreover, three methods have been designed to reduce the CE of SMPS, such as the capacitor shunt between the source and drain electrodes of MOSFET, CM choke and crosstalk choke, and the capacitors matrix. The experiment results show that the CE of the power concentrator and colonoscopy can be suppressed well and pass EN 55022 class B, thus realize the proposed approaches good validation.

Abstract: A Newton-Raphson (N-R) based method is developed for performance evaluation of power delivery networks (PDN) with arbitrarily shaped parallel-plate power/ground plane pairs. The proposed method allows for PI assessment in a few iteration steps while providing significant computational efficiency compared to alternative methods. The proposed method is tested on a practical example and the results are observed in good agreement with those obtained from a numerical electromagnetic (EM) simulator.