Design of a Low Voltage CMOS Transconductance Amplifier

Design of a Low Voltage CMOS Transconductance Amplifier This project aims to illustrate the design and simulation of a Low Voltage Complementary Metal Oxide Semi Conductor (CMOS) Transconductance Amplifier (OTA) with an improved power consumption, Direct Current (DC) gain and bandwidth. Two techniques were introduced for linearization: Pseudo Differential Pairs and Source degeneration under nano-scale technology. The nonlinearity, which is caused by the short length effect due to the small size of transistor can be reduced using linearization techniques, Two techniques were introduced for linearization: Pseudo Differential Pairs and Source degeneration, were both go under nano-scale CMOS technology. The proposed OTA requires a proper control system, where the common-mode control system has been designed for system stability . The results of this implementation are: power consumption of (x), DC gain of (x) , a size of (x)  µ, number of transistors (x) . All the work was simulated using the Advances Design System ( ADS ) , under 130nm CMOS Technology. 1.1 Motivation The huge pace in technology and the growing demand of electronic devices makes the Integrated Circuit ( IC ) designers think twice about low power and low voltage with the trade of the Threshold Voltage ( VT ) which doesnt scale down when compared to the power supply. Throughout the years, designing analog integrated circuits has been challenging, where the power supply is being reduced due to the demand of technology which requires to scale down the total power. The Operational Transconductance Amplià ¯Ã‚ ¬Ã‚ er (OTA) is recognized to be one of the most important basic building blocks in analog ,mixed mode circuits, filters, including multipliers, voltage control oscillators, and Very Large Scale Integrations ( VLSI ) applications, where the VLSI technology is the process of creating ICs by combining several transistors into a single chip. In such applications the OTA is the key circuit to such design, OTA at the input of the block determines the efficiency of the overall system, hence improving the performance of the OTA block is critical for enhancing the overall module performance. Operational Transconductance Amplifier An OTA main purpose is to convert its input voltage to the desired output current; i.e. in other words an OTA is a voltage controlled current source, where Gm is the Transconductance with a unit (Ampere/Volt). In real life circuits, harmonics are introduced, and nonlinearity should be taken into consideration which caused by the short channel effect of the transistors, the expression of the output current with Taylor series expansion can be as follow : where ai is determined by the implementation of the circuit. In order to achieve a proper OTA with the specifications mentioned, linear transformation factor should be implemented in the design to reduce harmonics, linearization methods have been developed through the years to solve the problem. 1.2 Objectives The main goal is to design a low voltage Transconductance CMOS amplifier which converts its input voltage to the desired output current with high linearity, which can be achieved by linearization techniques, Pseudo Differential Pair and Source degeneration techniques. 1.3 Realistic Constraints The listed below are the main constraints that should be taken into consideration for the design : 1.3.1. Economic Constraints: The student shall use the available simulation tools such as : Advanced Design System for simulation design, and Synopsys for layout . As for the design, the main goal is to reduce harmonic distortion, achieve high linearity, and to be able to transform the input voltage to the required output current with minimum size. Since the size of the transistors determine the size of IC , and the size contributes in the cost of the IC. The designed IC is being manufactured in fabrication laboratories. During the fabrication process, thousands of ICs are being etched onto a single blank wafer. After the testing process ,only percentages of the ICs are considered useable, and being distributed among electronic stores. 1.3.2. Manufacturability and Sustainability Constraints: The designed circuit shall be worked across process and temperature corners for improved yield. 1.3.3. Ethical and Safety Constraints: Documentation should not have more than 30% similarity on Turnitin. 1.3.4. Standardization All technologies used in this project are 130 nm CMOS technology. 1.4 Design Requirements The design shall meet the following requirements: The design uses CMOS based technology. The total power consumption will be less than 15mW. The supply voltage will be less than 1 volt. Bandwidth should be larger than 50MHz DC gain should be larger than 20dB 1.5 Design Achieved The goal of this project was achieved by designing a low voltage CMOS transconductance amplifier using linearization techniques with high linearity, low power consumption of (x), DC gain of (x) , a cost of (x). 1.6 Task Distribution Work was done as a team; but some work was distributed to ensure every member has their own task. This is shown in the table below: Stage Details Marwa Marah Rateb All Research Reading papers Setting goals Design of Pseudo Differential Pair Design Build Design of Source Degeneration Design Build Design the Common Mode Design Build Connecting The circuitry ( suggested OTA ) Design Build Layout Design Build Documentation Ch.1 Ch.2 Ch.3 Ch.4 Ch.5 Table 1.1: division of labor 1.7 Organization The rest of the documentation illustrates the design characteristics where it goes as follows; Second chapter discusses the background and literature review of different approaches related to the same design. Third chapter discloses in detail the overall design, including the explanation of each linearization techniques, as well as justifying the region of each transistor. Forth chapter demonstrates the results of the design. To end with, chapter Five conclude the design, along with the future work which can be implemented to improve the design. 2.1 Transconductance Amplifier Topologies This project aims to design an Amplifier which able to convert its input voltage to the desired output current, with Pseudo Differential Pair and Source Degeneration as linearization techniques Varies architectures had been developed through the past years to build the basic OTA block Table 2.1 :comparison between three different papers Design Design Requirements Referring to chapter 1, the design shall meet the following requirements: The design uses CMOS based technology. The total power consumption will be less than 15mW. The supply voltage will be less than 1 volt. Bandwidth should be larger than 50MHz DC gain should be larger than 20dB Analysis of Requirements and Constraints In order to attain the design specifications mentioned in section 3.1, the requirements and constraints are clarified below Analysis of Design Requirements CMOS based technology CMOS circuits components are becoming the most desired to be implemented in nowadays technology, due to its low power consumption. Furthermore, its high speed when compared to other used technology. Power Consumption Supply Voltage Bandwidth DC gain Analysis of Design Constraints Economic Constraints Manufacturability and Sustainability Constraints The design should meet the proper operating temperature and environmental corners. The circuit topologies have been implemented using an advanced simulation that can foresee the behavior of the circuit under such circumstances. For instance, a high power circuitry will increase its temperature, thus the degradation of the performance in time, but if the circuit surpass in supreme corner, it is expected to have a longer life time. Ethical and Safety Constraints Documentation shouldnt exceed 30% similarity, citation should be considered along with stating proper referencing Design Approaches According to the cited papers in chapter 2 there are four different architectures for the converter design. All of these architectures cant be used to achieve the requirements of this project. The developed design discussed in the next section has the opportunity to achieve the requirements

The Bernard Lawrence “Bernie” Madoff Scandal

unethical in the conduct of business. A Ponzi scheme also known as a pyramid scheme is an illegal savings scheme where unwary savers are lured into putting their money into the fraudulent organization’s account with the promise of unusually high returns. On the surface this may look legitimate. But the problem is that unlike financial institutions who lend out or invest customer’s funds Ponzi schemes use funds received from newer entrants to pay out the earlier entrants exorbitant interest rates. They arouse others greed by enticing them with the prospect of high returns.They pretend and falsify their financial records to create a false sense of stability. No sane government can register such schemes. They therefore operate illegally. Mr. Madoff stands accused of nepotism. This is a business practice why by the owner employs relatives and close associates. Suffice it to say that Madoff had more than 25 employees. However those in key positions were family members most o f whom owned shares of the company. These included his wife Ruth Madoff, two sons Mark and Andrew Madoff, his brother Peter Madoff, Peter’s daughter Shana, and Madoff’s nephew Charles Weiner.It is unethical to use a well positioned family team to cover up illegal dealings. It is unethical to sent more than $250 million from his New York-based firm, Bernard L. Madoff Investment Securities obtained ripping off unsuspecting savers in a Ponzi scheme to Madoff Securities International Ltd in the UK, and then back to accounts in the U. S. Question 2: Name three types of parties who were impacted by the actions of Mr. Madoff, and describe how they were impacted. Madoff’s friends included business associates who knowingly or unknowingly served to lure customers into his business.While the going was good, they were well rewarded. They occupied positions in charitable organizations, and received hefty compensations for their services and cooperation. However when the sche me was busted they lost their positions, face, as well as their incomes. Some politically correct friends had to refund monies that had been given to them through Madoff sponsored organizations. The worst party hit was his customers. Many of them were ruined financially for life. The total loss to investors is reckoned to be somewhere between 12 to 20 million dollars. On the flip side, there are those who gained.According to minutes from the trustee about $36 billion was invested into the scam, returning $18 billion to investors, with $18 billion missing. This being a pyramid scheme about half of Madoff's investors were â€Å"net winners,† earning more than their investment. The extend of embarrassment Madoff’s family experienced can only be imagined. Apart from loosing face, they lost a lot of assets. Their bank accounts were frozen and property confisticated. They are also facing legal charges for negligence, and breach of fiduciary duty by virtue of being accomplice s with Madoff.Question 3: Describe three business safeguards (risk management) that may have prevented the harm caused by Mr. Madoff. Government regulations: The hedge funds industry is considered as low risk. While the law enforcers are very strict with the banking and insurance sectors, they do not pay much attention to hedge funds. This made it easy for a smooth operator like Madoff to receive money from investors and manage the same which is illegal. He achieved this through engaging various institutions who were themselves under government regulations. Stricter regulatory and standardizing approaches of the hedge fund industry need to be put in place.a ‘best practice’ charter should be drawn and implemented. Proper audit of the Madoff’s transactions would have revealed anomalies. Independent external auditors would have done the job sufficiently. Question 4: Describe three ways private investors might have better protected themselves from risk. Due diligence in this case is the process of monitoring and reviewing the operation and management of hedge funds and those managing them. The collapse of Madoff was an expensive lesson in the importance of investors and their advisors carrying out thorough due diligence and not relying on word of mouth endorsementDiversification of risk: the nature of a pyramid scheme is to so attractive that potential investors have no other option but put their money in there. With high returns and no fees charges investors were sold. It did not occur to them to avoid putting all their eggs in one basket. There are two types of investor’s risk: systematic risk and market risk. Systematic risk is associated with a single security and is reduced by diversifying or investing is other types of securities. Market risk is occasioned by economic forces and can not be wished away. (Petty 2007)Refraining from greed: The saying that ‘when the deal is too good, think twice came true for the victims of the M adoff scam. The profile of its victims is not simple individuals disconnected from the financial markets and its remote mechanisms but investors who presumably have an expert knowledge of the trade of financial investment: rich private individuals and large financial institutions. The deal was just too good that they closed their eyes to anything else. It is a lesson to all that when investing one has to be level headed and not let themselves be overtaken by greed.Question 5: Describe three legal actions that possibly may be brought against Mr. Madoff under criminal or civil law. Securities fraud: the SEC regulates against trading based on information that is not available to the public, Accounting fraud and misrepresentation (presenting misleading or untrue information about a company, or its securities, to an investor or the public). This crime earned him a maximum penalty of 20 years in prison; fine of the greatest of $5 million or twice the gross gain or loss from the offense; r estitution.International money laundering: In his book ‘Money Laundering’, Leonard Jason-Loyd describes it as a form of criminal activity where by money is placed in banks then passed through a number of transactions to act as a smoke screen in order to hide the origin of the cash and later returned to the launderer via the legitimate financial system. (p. 2). Madoff’s crime of transferring funds between his New York-based brokerage operation and the London trading desk earned him a maximum penalty of 20 years in prison, fine and restitution.False Statements: Making a false filing with the Securities and Exchange Commission including processed stock trades, use of client money as collateral to obtain loans. This earned him a maximum penalty of 20 years in prison, fine and restitution. References Caruso, D. B. , February (26, 2010) (2 June 2010). Former Madoff Aide Charged with Conspiracy, and Securities Fraud. The Associated Press Retrieved from www. law. com/jsp /article. jsp? id=1202444611999 – United States Lloyd L. J. (1997). The Law on Money-Laundering: Statutes and Commentary, London, Great Britain, Frank Cass & Co.Ltd ‘Madoff scandal poses challenges for directors’ (21 Dec 2009) (2 June 2010) Risk Management Lessons from Madoff Fraud Retrieved from www. lloyds. com †º Petty, w. , Keowon, A. J. , Scott JR, D. F. , Martin, O. N. , Burrow, M. , Martin, P. , Nguyen, H. (2006) Financial Management, Frenchs Forest, NSW, Australia, Pearson Education Australia. Silver, V. , Glovin, D. , (2009, 13 Feb), (2 June 2010). Madoff Scandal Ensnares Order of Patron Saint for Moralists. Bloomberg News, Retrieved from www. bloomberg. com/apps/news? pid=20601109& refer=home

Short Article Reveals the Undeniable Facts About How Can I Write an Essay about Myself and How It Can Affect You

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Racism and Its Deep Roots in US History - 1688 Words

Racism and Its Deep Roots in US History Throughout US history, white Americans often viewed the other races (or coloreds) as inferior. Even though slavery had been abolished, laws and practices inhibited the fundamental rights African Americans were entitled to. Thus the mentality of racism and prejudice thoughts had persisted in people’s minds. The novel To Kill a Mockingbird by Harper Lee is set in Maycomb County, Alabama during the timeframe of the 1930s. Citizens of Maycomb County abide by a set of segregation laws and practices. Maycomb County is a typical homogenized and strictly divided region in southern US. The main character Scout is challenged with concepts regarding morality and ethics when dealing with racism occurring at†¦show more content†¦In our courts, when its a white mans word against a black mans, the white man always wins. Theyre ugly, but those are the facts of life† (Lee. p.117). A few days later, there was news going about Tom Robinson being gun down while attempting to escap e. The death of Tom Robinson provoked more racist stereotypes concerning the morals and ethics of African Americans. As Scout thought in her head, â€Å"To Maycomb, Toms death was typical. Typical of a nigger to cut and run. Typical of a niggers mentality to have no plan, no thought for the future, just run blind first chance he saw. Funny thing, Atticus Finch mightve got him off scot free, but wait-? Hell no. You know how they are. Easy come, easy go. Just shows you, that Robinson boy was legally married, they say he kept himself clean, went to church and all that, but when it comes down to the line the veneers mighty thin. Nigger always comes out in em† (Lee, p. 128). The execution of Tom Robinson implies the title of this book: To Kill a Mockingbird. In a literal sense, Tom Robinson is like a Mockingbird, whom does no harm. In a way he might have already â€Å"died† or lost faith in himself when he was sentenced to prison. Atticus could have appealed his case to the state supreme court which he might eventually be acquitted. As Atticus once informed Scout and Jem earlier that it is an sin to kill a Mockingbird. It can be implied that Bob and Mayella Ewell are responsible for killing of a mockingbird, which in aShow MoreRelatedPolice Rights Research Paper970 Words   |  4 Pagestake a knee during the National Anthem. This one act set off a firestorm that has echoed deep in the core of the American conscious. It began to show the differences of this country in a new light. â€Å"If human differences have their place, so also does divine unity. For those who are in relationship with God, this unity must, because of God’s nature, have precedence over diversity,† shares Okholm. What the root of this protest by Kaepernick? 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