Comparison Of Different Types Of Ic Design Computer Science Essay

Comparison Of Different Types Of Ic Design Computer Science Essay The topic of this assignment is to compare on different types of IC design. Therefore, we must first understand the meaning of IC. An IC, integrated circuit, is also known as microcircuit, microchip, silicon chip, or chip. It is a small electronic circuit that consists of semiconductor devices and other passive components. These components are manufactured on a ceramic or plastic container. Internal connections are welded from the chip to different number of external pins depending on the chips function. IC design means that using logic and circuit design techniques to design and produce integrated circuits. It requires pathways so that information can flow properly and small electrical components are organized to maximize space so that computer systems can be as small as possible. Living in this modern age of data information, we need to design faster and smaller IC to increase our daily life quality and to catch up with the technology. IC design is classified mainly into two categories of analog and digital IC design. Digital IC design is the most widely used in daily life such as microprocessor, FPGAs, memories (RAM, ROM, and flash) and digital ASICs. On the other hand, analog IC is used in the design of sensors, power management circuits, and operational amplifiers. The figure of IC is shown below : Figure 1(a) Figure 1(b) (Adapted from introduction to ASIC, http://iroi.seu.edu.cn/books/asics/Book2/CH01/CH01.htm [1]) Figure  1(a) shows an IC chip where the pins will fit into holes in a printed-circuit board or breadboard. Figure  1(b), the silicon chip (more properly known as a die) is fitted in the cavity under the sealed lid. A more detail classification of IC based on digital and analog is as follow : Chart 1 : Hierarchical classification of IC Referring to chart 1, as we are more interested in the branch of digital IC design, I expand more on its hierarchy compare to others. I will first compare between analog and digital IC design. Then I will explain on the advantages of each of them and mixed-signal IC design. Next, I will compare and explain on full custom and semi-custom IC follow by a simple explanation of silicon compilation as it is not discussed in lectures. After that, I will compare gate array, standard cell and PLDs. Content Analog, digital and mixed signal IC design The comparison between analog and digital IC design is tabled as below : Characteristics Analog IC design Digital IC design Noise More susceptible to noise Less noise Precision Less precise More precise Design difficulty Harder to design Easier to design Complexity High Low Power consumption Low High Heat dissipation Low High Design work Demands strong understanding of the principles, concepts and techniques done by copying and reusing the same circuit functions or library Life cycle 10years 1 to 2 years Cost Low High Information storage Noise from aging degrades information noise-immunity makes information not degraded Table 1 : Comparison between analog IC design and digital IC design Analog IC design In analog IC design, the analog signals take any value from a given range, and each unique signal value represents different information. It is often found in op-amps, linear regulators, phase locked loops, oscillators and active filters. Therefore, a slight change in the signal may affect the design. For example, an analog signal is used to represent temperature, with one volt representing one degree Celsius. Therefore, 10 volts would produce 10 degrees, and 10.1 volts would produce 10.1 degrees. Analogue IC design produces noise, which is a random disturbance, variation or random thermal vibrations of atomic particles. Since any changes in an analogue signal is significant, any disturbance will change in the original signal and appears as noise. As the signal is copied and re-copied, or transmitted over long distances, these random variations become more significant and lead to signal degradation. Other sources of noise may include external electrical signals or poorly designed com ponents. These disturbances are reduced by shielding, and using low-noise amplifiers.[2] However, some irreducible noise such as the shot noise in components will make an analog IC design imprecise. When designing an analog circuit, the choice of every single component, size, placement, and connection is crucial. Every small detail such as the resistance, placement and number of resistor, will affect the performance of final result. Therefore, designing an analog IC requires strong understanding of the principles, concepts and techniques. Hence, it is said that analog IC design is much more complex compare to digital IC design. It is harder to design because analogue circuit must be designed by hand, and the process is much less automated than digital IC. However, once an analog IC is designed successfully with high signal to noise ratio, low distortion, low power consumption, high reliability and stability, it can have a life cycle of more than 10 years. As a result of the long lif e cycle, the price of analog IC is low. Digital IC design A digital IC is designed to accept only input voltages of specific values and it uses only two states which are the binary quantities, on and off representing 1 and 0 or true and false. This is achieved by using the logic of Boolean algebra. The three basic logic functions in a digital IC are NOT, AND, and OR. A truth table is needed to design a digital IC. As discussed in the lectures, the design of digital systems is divided into combinational systems, which is a representation of a set of logic functions, and sequential systems, which are state machines. It is often found in microprocessors, FPGAs, memories (RAM, ROM, and flash) and digital ASIC. Digital IC design produces less noise or even no noise. Digitally represented signals are transmitted using binary sequence of 1 and 0. It can be reconstructed, retransmitted or transmitted over long distance without any error provided the noise during transmission is unable to alter the 1s and 0s. Hence, digital IC is more precise compare to analog IC. Even in a compact disc of around 6 billion binary digits, the information or data can be presented precisely because each digit is handled by the same kind of hardware and there is no noise in the handling process. Digital IC is easier to design because it is controlled by software such as electronic design automation tools (EDA) so that functions can be altered without changing the hardware. If consumers detect error, they can simply upgrade the software to rectify the error. As digital IC is almost immune to noise, information can be stored and retrieved completely and precisely without any damage or degradation. However, there are some disadvantages of digital IC. Because digital IC is very dense in circuitry, digital circuits use more energy than analog circuits to accomplish the same tasks, thus producing more heat. In portable or battery-powered systems this can limit use of digital systems.[3] Digital IC emphasizes on speed and cost ratio computing to achieve the lowest possible cost with the highest operating speed. Designers must use more efficient algorithms to process digital signals, or use new process to improve the integration cost. Therefore, the life cycle of digital IC is very short, about 1 year -2 years and the cost is higher than analog IC.[4] Since digital circuits involve millions of times as many components as analog circuits, much of the design work is done by copying and reusing the same circuit functions, especially by using digital design software that contains libraries of pre-structured circuit components. [5] Mixed signal IC design A mixed-signal integrated circuit is any integrated circuit that has both analog circuits and digital circuits on a single semiconductor die.[6] Mixed-signal can be found in ADC or DAC and digital radio chips. Since mixed-signal IC requires both analog and digital design, it is usually designed for a very specific purpose and because of that, their design requires a high level of expertise and careful use of computer aided design (CAD) tools. Therefore this type of design is very complicated andcostly. Full-custom and semi-custom IC design The comparison between analog and digital IC design is tabled as below : Characteristics Full-custom IC design Semi-custom IC design Circuits Customized Predesigned Manufacturing time Long Short Performance Maximize Moderate Area of IC Minimize Moderate Cost High Low Table 2 : comparison between full-custom and semi-custom IC design Full-custom IC design Full-custom design is a methodology for designing integrated circuits by specifying the layout of each individual transistor, logic cells, mask layers and the interconnections between them.[7] Basically, the IC is designed from scratch and tailor-made to meet the requirement of a specific purpose. The main goal of having a full-custom design is to maximize the performance and minimize the area of an IC. Therefore, a lot of researches and studies are needed to produce a full-custom IC which results in very high production cost and long manufacturing period. Usually, full-custom IC is catered for large production so that the high production cost is fully utilized. Full-custom IC is produced from time to time when there is no suitable existing libraries available that can be used for the design. This is because existing libraries are outdated or consume too much power. Semi-custom IC design Semi-custom IC design can be partly customized to serve different functions within its general area of application.[8] It allows a certain extend of modification during the manufacturing process. It has the diffused layer fully defined but the libraries of pre-structured circuit components with the same circuit functions can be reused. This can save a lot of time and cost to in producing a semi-custom IC design. Therefore, the manufacturing cost if low and it is used widely in almost every IC design around the world. Semi-custom IC design is further classified into 3 groups which are gate array, standard cell and programmable logic devices circuits. Silicon compilation IC design Silicon compilation is to use a software system that takes a users specifications and automatically generates an integrated circuit (IC).[9] Generally, a designer is given a description of the system, by using a silicon compiler, mask and test information are produced which is either a simple combinational circuit or a finite state machine. The first step of silicon compilation is Convert a hardware-description language such as Verilog or VHDL or FpgaC into logic. Next, we shall place the logic gates on the IC followed by routing the standard cells together to form the desired logic.[9] A drawback of this method of IC design is that most of the silicon compilers do not utilize the area of silicon efficiently. Therefore, it is usually produced in small volume. It may used to generate simple cells to build up standard cell libraries.[10] Gate array, standard cell and programmable logic devices (PLDs) IC The comparison between gate array, standard cell and programmable logic devices circuits is tabled as below : Characteristics Gate array Standard cell PLDs (FPGA) Flexibility Flexible Very flexible Less flexible Risk Less risky Less risky Risky Manufacturing Cost Moderate Cheap Expensive Manufacturing Difficulty Moderate Easy Very complex Manufacturing time Shortest Short Moderate Silicon size Moderate Small Limited Speed Slow Moderate Fast Heat dissipation Low Moderate High Table 3 : Comparison between gate array, standard cell and PLDs (FPGA) IC Gate array IC In a gate-array-based IC, the transistors, logic gates and other active devices are predefined on the silicon wafer. The only uncompleted part of the creation is the final surface layer, which defines the interconnect between the elements. Connecting these elements allows the function of the IC to be customized. Therefore, it is very flexible and less risky since it uses predefined elements. Furthermore, adding a surface layer of interconnects requires only a small cost and short time to complete. However, the chips designed using gate array techniques are a bit bigger in silicon area than standard cell IC, which makes them more expensive and harder to manufacture.[11] Standard cell IC In standard cell IC, different sizes of predesigned cells are used and a big combination of cells can be formed which is known as mega cells. Mega cells can be found in microcontroller or microprocessor. These cells, which consist of logic functions such as gates, latches, buffers and flip-flops, are known as standard cell library. Designer only needs to define only the placement of the standard cells and the interconnects in a standard cell IC.[12] Standard cell IC is flexible because it uses both digital and analog functions. The transistor sizes can be changed to improve speed and performance. It has a smaller silicon size and therefore a more compact are compare to gate array IC. In addition, it has faster speed which results in higher heat dissipation. (Adapted from Standard-Cell-Based ASICs, http://iroi.seu.edu.cn/books/asics/Book2/CH01/CH01.1.htm#pgfId=1331)[1] Figure 2 shows A cell-based IC die with a single standard-cell area (a flexible block) together with four fixed blocks. Programmable logic devices IC PLD is an electronic component used to build reconfigurable digital circuits an undefined function at the time of manufacture.[13] Before starting to implement PLD in a circuit, it must be configured or programmed to create a part customized to a specific application. This makes PLD a very flexible design to fulfill any custom specification. However, the limited size ( (adapted from Programmable Logic Devices, http://iroi.seu.edu.cn/books/asics/Book2/CH01/CH01.1.htm)[1] Figure 2 shows a PLD die. The macrocells typically consist of programmable array logic followed by a flip-flop or latch. The macrocells are connected using a large programmable interconnect block.

Cain and Abel Analysis

Cain and Abel The Graves/Jung model is an interpretative method that attempts to explain a variety of things on a variety of levels. It explains how individuals progress, how societies progress, how theories progress, how we view others, and how others view us; just to name a few. I will be applying the theory to analyze the story of Cain and Abel found in the fourth chapter of Genesis, in the Bible. I will be interpreting the three main characters to assess what level of the model they are functioning in. We meet the main characters of the story in the first two verses.Cain is Abel’s older brother and we learn of their occupations, â€Å"Abel was a keeper of sheep, and Cain a worker of the ground. Their nature of their occupations could already be setting up the idea that Abel is physically small and Cain is physically larger. In the Hebrew world, shepherds are historically the youngest children and often girls. Later in the Bible, there is a mirror of this in 1st Samuel. it is King David (portrayed as the smallest amongst his brothers) who is also a shepherd. Typically anyone who â€Å"works the land† is going to have to be physically fit, which leads to more capabilities of physical violence.The author may have put these important details in to start to paint the picture of â€Å"helpless innocent Abel† and â€Å"big bully Cain†. This is just the beginning of why this is a Level 3 story of competitive, survival-of-the-fittest type interactions. Even though the characters might be functioning at the level 3, I think the society they are living in is at least level four. We see this in verses three and five when the third main character is introduced, â€Å"the Lord†. The fact that Cain and Abel’s god needs a offering implies that at some point someone said or wrote that he needed one.They wouldn’t just do that if it were not made clear by society that offerings were expected. This is all fitting with Level fou r. This also implies that the god is at least a level four god. In verses six and seven the Lord states, The LORD said to Cain, â€Å"Why are you angry, and why has your face fallen? If you do well, will you not be accepted? And if you do not do well, sin is crouching at the door. Its desire is for you, but you must rule over it. † This shows that the god of this story can function on level six.He is empathizing with Cain and even offering advice, or at least his challenge to Cain without explicitly telling him to not go through with his anger. However, to get to a level six, one must come out of a level five which came out of a level four. The level four god comes out in his punishment of Cain, â€Å"And the LORD said, â€Å"What have you done? The voice of your brother's blood is crying to me from the ground. And now you are cursed from the ground, which has opened its mouth to receive your brother's blood from your hand. When you work the ground, it shall no longer yield to you its strength.You shall be a fugitive and a wanderer on the earth. † He is saying by this punishment that there are rules and you broke them, a very level four statement. The god in the story of Cain and Abel when the context is not extended to the whole Bible is a level four god. Cain is a textbook level three character he gets â€Å"angry† and jealous that someone else did better and he decided to go through with level three actions in verse 8. â€Å"Cain spoke to Abel his brother. And when they were in the field, Cain rose up against his brother Abel and killed him. Cain essentially decided that he was bigger and stronger so he could deal with things accordingly. The problem with that is that he is on a level four society with a level four god. Level four was created to stop individuals functioning at level three and this story follows suit with the Lord’s punishment of Cain and the society carrying it out. This is seen in verse 15, Then the LORD said to him, â€Å"Not so! If anyone kills Cain, vengeance shall be taken on him sevenfold. † And the LORD put a mark on Cain, lest any who found him should attack him. Now we also see a little bit of level two come out in Cain’s words.When the lord asks him where his brother is, Cain responds with, â€Å"I do not know; am I my brother's keeper? † This is a very mischievous thing to say because Cain knows exactly where Cain is. It is very similar to a child being asked by his parents â€Å"Where did all those cookies for the shower go? † and the child who, while knowing it was wrong, ate them responds with â€Å"well I don’t see them anywhere. † Cain is mirroring this. I find it interesting that when it comes to a conflict both the Lord and Cain begin to function in lower levels than their original state.Lastly there is Abel, since the author doesn’t give us and lines of dialogue to reference, we will use the context of the story to evalua te what level character he is. I would say because he abides by the level four standards set by society and the level four god then he is at least functioning at the level. We see this in the fact that not only was he attempting to do the societal norm in making an offering that potentially allowed him to have â€Å"regard† with the Lord but also he succeeded in that. This shows he possibly could be a higher level than four but it is hard to say since we do not know exactly how he responded to Cain’s attack.

Australia and China Tade Essay

China is a country located in East Asia. It is the world’s most populous country, with a population of over 1.35 billion. China is the fourth largest country in the world behind Russia, Canada, and the United States. Australia is a continent and a country in the Southern Hemisphere, lying to the south of Southeast Asia, which divides the Indian and South Pacific Oceans. The population of Australia is 23 million. In 2009 China surpassed Japan to become Australia’s largest export market, the Australian and Chinese economies are strongly complementary. As a result, our trade and investment relationship is substantial and has developed well beyond its modest beginnings in the 1970s. According to Australian statistics, two-way merchandise trade has grown from $113 million in 1973, just after the establishment of diplomatic relations, to $78.2 billion in 2009. China is Australia’s largest trading partner, with total trade (goods and services) in 2009 valued at $85.1 billion, an increase of 15.1 per cent over the previous year. Government and/or NGO Roles: The Australian Government established the Australia-China Council (ACC) in 1978 to promote mutual understanding and foster people-to-people relations between Australia and China. The Chairperson is appointed by the Executive Council on the recommendation of the Minister for Foreign Affairs, who also appoints the Board members. The function of the Council is to make recommendations to the Australian Government through the Minister for Foreign Affairs on strengthening the Australia-China relationship in ways that support Australia’s foreign and trade policy interests. The Australia China Business Council (ACBC) is a membership-based, non-profit, non-governmental organisation comprising of a National Office, six Branches, and more than 1500 representatives from over 700 Australian companies who do business with China. Founded in 1973, ACBC actively promotes two-way trade and investment, and economic cooperation and understanding, between the business communities of Australia and China. ACBC plays an influential role as an advisor to the Australian Government on commercial relations with China. They are a strong supporter of the Free Trade Agreement between Australia and China to foster more competitive business in both nations. Founded in Beijing in 1996, The China-Australia Chamber of Commerce’s (AustCham Beijing) overriding goal is to advance Australian Business in China. It functions to provide members with the information, resources and contacts they need to succeed in China. The Chamber maintains a good working relationship with the Australian Embassy and with the various Australian government departments in China. AustCham is a non-profit organization, which operates independently from government. It is funded entirely by their membership and Chamber activities. Together with their sister AustChams in Hong Kong, Shanghai, and Guangzhou, they work to promote strong trade and investment links between Australia and China. Treaties and Agreements- formal and/or informal: On the 18th of April 2005, Australia and China agreed to commence negotiations on a Free Trade Agreement (FTA) following consideration of a joint FTA Feasibility Study. The study was completed in March 2005, and concluded that there would be significant economic benefits for both Australia and China through the negotiation of an FTA. From April 2013, WESTPAC and ANZ banks will now be the first to directly trade Australian dollars into Chinese Yuan. Due to this fact, deepening of relationships between China and Australia, it signals deepening of trade connections and great opportunities for future growth.† Advantages and Disadvantages to Australia of this link: Advantages: Employment will increase in exporting industries and workers will be displaced as import competing industries fold (close down) in the competitive environment. With free trade many jobs have been created in Australia, especially in manufacturing and service industries Consumers benefit in the domestic economy as they can now obtain a greater variety of goods and services. The increased competitions ensure goods and services, are supplied at the lowest prices. Disadvantages: This can impact upon large numbers of workers, their families and local economies. Often it can be difficult for workers to find employment in growth industries and government assistance is necessary. This means that businesses, employees and consumers are more vulnerable to downturns in the economies of our trading partners. Future Direction of link: Australia and China share a strong and rapidly growing trade and economic relationship. Further strengthening and deepening this relationship is a major priority for both countries, with both governments committed to sustaining the impressive trade and investment performance achieved in the past two decades. In that time, China has become Australia’s largest two-way trading partner and vital to Australia’s future economic prosperity.

The Faerie Queene Essay - 466 Words

The poem, The Faerie Queene, is a story about a courageous knight who goes through great trials and fights monsters. This in itself is entertaining but, it also has many allegorical references to Christianity. Many times Spenser talks about things when in reality hes really talking something closer to home. For instance, this faerie land he talks about sounds like he is referring to England, the country where hes from. Also, the title Faerie Queene itself is seems to represent Queen Elizabeth, the Queen of England. Redcrosse, the hero of the poem, is a major part of this allegory. He is called the Knight of Holinesse which is a reference to being holy and worshiping God. He represents the lonely Christian on a journey to put†¦show more content†¦As Redcrosse and Una travel on their way, things are fine and both are kept in tact. Redcrosse is first introduced to evil when fighting the dragon, Error. When fighting the dragon, Spenser writes, Her vomit full of bookes and papers was (177). These papers represent Roman Catholic propaganda that was put out in Spensers time, against Queen Elizabeth. This shows the allegory Spencer was trying to put forth in writing this poem. After defeating the dragon, Redcrosse and Una travel looking for the right path, when it starts to get dark and they find a place to stay, with a hermit in his inn. When they fall asleep, we find out who this hermit is, Archimago, an evil sorcerer. He conjures up two spirits to trouble Redcrosse. One of the spirits goes into his dreams and makes him dream of love and lust, when he awakes; he is lying next to the other spirit who is disguised as Una, who asks for a kiss from him. He turns it down, and falls back asleep. Then Archimago takes the spirit disguised as Una and lays it in a bed, and takes the other spirit and disguises it as a young man. Redcrosse awakes and sees this and is furious and decides to leave without her. The mission Archimago was out to accomplish had worked and he had separated holiness and faith. Now without faith, Redcrosse goes out and is all on his own. He travels on until he meets another knight, Sansfoy,Show MoreRelated The Faerie Queene Essay1944 Words   |  8 PagesEdmund Spenser’s epic poem The Faerie Queene is well known as an allegorical work, and the poem is typically read in relation to the political and religious context of the time. The term allegory tends to be loosely defined, rendering a whole work an extended metaphor, or even implying â€Å"any writing in verse or prose that has a double meaning†(Cuddon 20). In true Spenserian style, with everything having double meanings, both uses of the term allegory are applicable to his writing. 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