Low power reduction Electrical Engineering Essay

Low power reduction Electrical Engineering - Essay Example However, the key low-power breakthrough was the invention of the complementary metal-oxide-semiconductor (CMOS) integrated circuit in 1963. Most integrated circuits, especially low-power ICs, use CMOS devices as their building blocks. The smaller the power dissipation of electronic systems, the lower the heat pumped into the rooms, the lower the electricity consumed and hence the lower the impact on global environment, the less the office noise (due to elimination of a fan from the desktop), and the less stringent the environment/office power delivery or heat removal requirements. The motivations for reducing power consumption differ from application to application. In the class of micro-powered battery-operated, portable applications, such as cellular phones and personal digital assistants, the goal is to keep the battery lifetime and weight reasonable and the packaging cost low. Power levels below 1-2 W, for instance, enable the use of inexpensive plastic packages. For high performance, portable computers, such as laptop and notebook computers, the goal is to reduce the power dissipation of the electronics portion of the system to a point, which is about half of the total power dissipation (including that of display and hard disk). Finally, for high performance, non battery operated systems, such as workstations, set-top computers and multimedia digital signal processors, the overall goal of power minimization is to reduce system cost (cooling, packaging and energy bill) while ensuring long-term device reliability. Driving Factors. A crucial driving factor is that excessive power consumption is becoming the limiting factor in integrating more transistors on a single chip or on a multiple-chip module. Unless power consumption is dramatically reduced, the resulting heat will limit the feasible packing and performance of VLSI circuits and systems. Consequently, there is also a clear financial advantage to reducing the power consumed in high performance systems. In addition to cost, there is the issue of reliability. High power systems often run hot, and high temperature tends to exacerbate several silicon failure mechanisms. Every 10-C increase in operating temperature roughly doubles a component's failure rate. In this context, peak power (maximum possible power dissipation) is a critical design factor as it determines the thermal and electrical limits of designs, impacts the system cost, size and weight, dictates specific battery type, component and system packaging and heat sinks, and aggravates the resistive and inductive voltage drop problems. It is therefore essential to have the peak power under control. Achieving low Resistance. [[ The low resistance is achieved through appropriate metallic films on the IC with copper being the preferred material because, other than silver, it has the lowest resistance of any metal. The capacitance issue is addressed through the use of insulators with lower dielectric constants than silicon dioxide, the material of choice in the past. The switch has non-zero "on" resistance, Ron, when it is closed and finite "off" resistance, R off, when it is open. This has important implications for low power operation, because R on leads to power dissipation in

JB HIFI LTD BALANCE SHEET AS AT JUNE 2009 Essay

JB HIFI LTD BALANCE SHEET AS AT JUNE 2009 - Essay Example These analysis form an integral part of the financial statement analysis, especially from the investors point of view, who always strive to invest in countries having strengthen and stabilizing financial ratios and representing an upward trend. It is of great significance that the ratios must be benchmarked against a standard in order for them to possess a meaning. Keeping that into account, the comparison is usually conducted between companies portraying same business and financial risks, between industries and between different time periods of the same company. The company under consideration is JB Hi Fi Limited and in this report analysis of the financial performance of the company for the financial year 2009 with the financial year 2010 has been conducted in order to draw attention to various financial trends and significant changes over the period. The analysis is divided into three main categorize namely Profitability, Liquidity and Gearing. Profitability ratios identify how ef ficiently and effectively a company is utilizing its resources and how successful it has been in generating a desired rate of return for its shareholders and investors. Liquidity ratios measure the ability of the company to quickly convert its asset into liquid cash to settle its short term liabilities. Whereas, the Gearing ratios identifies the extent to which the company is financed through debt and to what degree the operations are being conducted from the finance raised through raising equity capital or otherwise. Financial Analysis JB Hi Fi Limited is regarded as one of the prominent when it comes to selling home appliances. The company is involved in selling plazmas, computer and tablets and several other digital home entertainment appliances. It holds a considerable market share and manages its operations through a well established supply chain. The company represents sound financial outcome as its turnover has increased by 27% during the financial year 2009 as compared to th e prior financial year, boosting the net profit by a massive 39%. The company’s reserves have also increased during the current financial year which shows that its investors are considering the company lucrative and are planning to have a long term association with it. Profitability Ratios    2009 2008    Profitability Ratios Gross profit margin 21.51% 21.86% Net profit margin 6.17% 5.65% ROCE 41.19% 39.71% Gross profit margin is an analyzing tool which assists in identifying how effectively and efficiently the company is utilizing its raw materials, variable cost related to labor and fixed costs such as rent and depreciation of property plant and equipment. The ratio is calculated by dividing the sales revenue by the gross profit. Analyzing the trend of gross profit margin, in the financial year 2009 the gross profit margin has marginally decreased as compared to the financial year 2008. Although the sales in the year 2009 increased by $498.702 million, but this was offs et by an increase of $ 397.802 million in the cost of sales. Net profit margin, on the other hand analyzes the profitability of the company before deducting the taxation and finance charges from the earnings. The ratio is calculated by dividing the profit before interest and tax with the sales revenue of the current finan