CMOS VLSI DESIGN.docx

Advantages of cmos design cmos is the basic building

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ADVANTAGES OF CMOS DESIGN CMOS is the basic building block of many of the digital circuits. The CMOS circuit itself acts as an inverter. It can be realized as a combination of PMOS in the pull up section whose source is connected to power supply and NMOS in the pull down section whose source is connected to ground and the output is taken across the drain junction of the two devices. The CMOS circuit has less power dissipation when compared to many of the previous VLSI families of RTL, TTL and ECL. The power consumption in CMOS is due to the switching activity of the transistors from one state to another state, charging and discharging of the load capacitance and frequency of operation. 23 | P a g e
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BCD takes advantage of the fact that any one decimal numeral can be represented by a four bit pattern. This is also called "8421" encoding. Excess 3 is a non weighted code. In XS-3, numbers are represented as decimal digits, and each digit is represented by four bits as the digit value plus 3 (the "excess" amount). The primary advantage of XS-3 coding over non- biased coding is that a decimal number can be nines' complemented as easily as a binary number can be ones' complemented . In addition, when the sum of two XS-3 digits is greater than 9, the carry bit of a four bit adder will be set high APPLICATIONS 1) The excess 3 code is a technique to represent numbers with a balance of positive and negative numbers. 2) When the sum of two of these excess 3 numbers exceed 9, the carry bit of adder will set to high. 3) When we add two excess 3 numbers, the resultant would not be an excess 3 number. 4) Because of many shortcomings in addition of the BCD code, excess 3 code is used in the shaft position of the airplanes. 5) These codes are precisely used in electro optical switches and electrochemical signals. 6) The excess-3 code can be used effectively for both addition and subtraction of decimal numbers, thus avoiding thedrawback of 8421 code. 24 | P a g e
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CONCLUSION The results were simulated using MICROWIND and DSCH and comparison has been done for different parameters of BCD to Excess-3 converter in different logic styles and CMOS design. The results show that the proposed CMOS logic design has less power dissipation and it also uses less power supply. These advantages made this logic more convenient for energy efficient digital applications. 25 | P a g e
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REFERENCES 1) A. P. Chandrakasan, S. Sheng, and R. W. Brodersen, “Low power CMOS digital design’’ 2) CMOS digital integrated circuits By Sung-Mo_Steve & Kang,_Yusuf_Leblebici 3) CMOS VLSI design By Neil H.E.Weste & David Money Harris 4) CMOS Circuit Design, Layout and Simulation by R. Jacob Baker,H.W.Li, and D.E. Boyce 5) Analog VLSI Signal and Information Process by Mohammed Ismail and Terri Faiz 26 | P a g e
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