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𝗣𝗗𝗙 | On Jan 1, , L. BISDOUNIS D. GOUVETAS O. KOUFOPAVLO and A comparative study of CMOS circuit design styles for low-power high-speed. HIGH SPEED CMOS DESIGN STYLES by. Kerry Bernstein. Keith M. Carrig. Christopher M. Durham. Patrick R. Hansen. David Hogenmiller. Edward J. Nowak . PDF High Speed CMOS Design Styles By Kerry Bernstein AUDIOBOOK WapSpot Mobi is the fastest and the best online youtube converter and.

In the circuit illustrated in Figure 7 a , both inputs and outputs are of current in gender. M1 transistor converts quantities of the input currents into voltage and provide it to an inverter.

The threshold voltage of the inverter is pointed out with TD and provided to the designer. M2 transistor is switched on and off under the control of the inverter, thus connects and disconnects the output current. If different quantities of TD are specified, the produced functions in the output of this circuit are also changed. As an instance, with a threshold detector from 0. The circuit in Figure 7 b is same as the circuit of Figure 7 a with a difference that in the output which is sinking instead of source.

As the Table 2 exhibit, Sum is different in merely two places with Majority not function when inputs are or These transistors must be arranged in such a way that ensures the correctness of the circuit as shown in Figure 8. Three capacitors are used to generate the Carry majority not function output. In order to design circuit operations in the given state one nMOS and one pMOS pass transistor are added to the circuit as shown in Figure 5.

Table 2. In view of the fact that three separate capacitors are used for designing each of these gates and that these input capacitors influence the circuit performance by replacing the number of capacitors, the overall performance of the system can be improved. Therefore we have eliminated six out of the nine capacitors. Simulation results illustrate that the reported adder circuits having low PDP works properly at low voltage [49].

Outputs of the circuit will be connected to power supply or ground and therewith, the circuit has good drive capability. These inverter based full adders are a suitable structure for the construction of low-power and high-performance VLSI systems. The basic idea to generate Sum from Carry by using 5 inputs majority-not function with three input signals A,B,C and with two Carry input signals are illustrated in Table 2 [].

DOWNL0AD in [P.D.F] High Speed CMOS Design Styles [F.u.l.l ~Books~]

This design is based on the idea that the carry output function is the same as 3- input majority function shown in Figure A A Maj. B Carry Maj. Its output Sum function is based on 5 input majority-not gates. In this design, the first majority-not gate is implemented with a high-performance CMOS bridge circuit [48].


This design uses more transistors, called bridge transistors, sharing transistors of different paths to generate new paths from supply lines to circuit outputs. The bridge design style offers more regularity and higher performance than the other CMOS design styles and is completely symmetric in structure. Its output Sum function is based on Current mode majority function.

In this design, the first majority-not gate is implemented with a high-performance dynamic CMOS bridge circuit [48]. The advantage of this adder cell is higher speed, lower transistor count and it compromises noise margin. Full adder output Carry function is designed with 3 input Majority Not function logic and output Sum function generated in bridge logic style as shown in Figure 12 a.

In this design, the majority-not gate is implemented with a capacitors and high-performance CMOS bridge circuit. This type of circuit is preferred in smaller area requirement with lesser delay at low voltage.

The advantages of the dynamic CMOS logic style are its robustness against voltage scaling and transistor sizing high noise margins and thus reliable operation at low voltages and arbitrary even minimal transistor sizes ratio less logic are possible. Input signals are connected to transistors gates only, which facilitates the usage and characterization of logic cells.

Full adder output Carry function is designed in Pseudo logic style and output Sum function generated from 5 input Majority Not function logic as shown in Figure 13 b. In the current mode, the current which is pulled from the Carry transistor must be twice as much as the current from input transistors to satisfy the following equations [33].

Its output Sum function is based on current mode majority function.

In this design, the first majority-not gate is implemented with a high-performance Static CMOS bridge circuit [35]. In MixFA3 full adder output Carry function is designed with 3 input Majority Not function logic and output Sum function generated in current mode majority function logic style as shown in Figure 14 b. In this design, the majority-not gate is implemented with capacitors.

The results of the designed circuits in this paper are compared with a reported standard CMOS full adder circuits. To perform a comparative study of simulation performance of various full adder topologies, the same input test pattern have used 3input signals A, B, C and these signals are square waves of equal on and off times. Each 1-bit full adder has been analyzed in terms of propagation delay, average power dissipation and their products.

PDP and EDP are particularly important when low power and high speed operation are needed and its comparison at 1. The maximum delay is taken as the cell delay.

The delays of the newly designed circuits are compared with other reported circuits. Figure 15 shows that the delay of the reported dynamic adders is low as compared with conventional static full adder circuits. However, simulation results show that the newly designed circuits can work at other supply voltages and also it is completely robust to voltage variations. The area overhead of the designed circuits is lower than that of reported conventional adders and also than that of some other adder circuits.

By optimizing the capacitance parameters and transistor sizes of the full adders that have been considered, it is possible to reduce the delay of all adders without significantly increasing the power consumption, and transistor sizes can be set to achieve minimum power delay product PDP and energy delay product EDP.

All adders are designed with minimum transistor sizes initially and then simulated. Table 3.

Results and Discussion 6. The power consumption worsens with the increase in the voltage supply. Hybrid full adder HyFA4 has the lowest power consumption in comparison to the other simulated adder circuits.

It worked successfully at low voltage supply. The MixFA3 full adder consumes higher power due to use of high power consuming current mode majority function in a single unit.

Delay Comparison Similar to previous simulation setup, the average propagation delay has been studied with the supply voltage variation in all circuits. Simulation results in Figure 14 show that MajFA1 is the best circuit in terms of speed at 1. It has high delay and high sensitivity against voltage scaling. Design2 HyFA3 is the fastest full adder circuit. Mixed mode adders have almost the same delay at 1. Energy delay product EDP Comparison Figure 16 shows the energy delay product of the Hybrid and mixed mode adder circuits.

The conditions are same as power and delay simulation setups. An extensive performance analysis of 1-bit MOSCAP based hybrid majority function and current mixed mode function full adders have been presented. Different adder logic styles have been implemented, simulated, analyzed and compared. Using the adder categorization and hybrid- CMOS design style, many full adders can be conceived. As an example, new full adders designed using hybrid-majority function design style with C-CMOS, Bridge and Pseudo logic circuit are presented in this paper that targets minimum delay and EDP.

The comparison of simulation results shows that the performance of the newly mixed mode designs are superior in terms of high-speed as against other reference designs of full adder circuits.

Weste and K. Addison —Wesley. Weste and D. Jha and S. Gupta, Testing of Digital Systems. Cambridge, U. Cambridge Univ. Rabaey, A. Chandrakasan, B. Pedram and M. Zhuang and H. Solid-State Circuits, Vol. Chandrakasan and R. Brent and H. Computer, Vol. Han and D. Computer Arithmetic, Italy, pp. Oklobdzija, B. Zeydel, H. Dao S. Mathew and R. VLSI Syst. Dao ,B. Zeydel and V. Issam, A Khater, A.

D.O.W.N.L.O.A.D in [P.D.F] High Speed CMOS Design Styles [F.u.l.l Books]

Bellaouar and M. Shalem, E. John and L. Great Lake Symp.

VLSI, pp. Circuits Devices Systems, Vol. Shams, Tarek K. Darwish, and Magdy A. Analog and Digital Signal Processing, Vol.

Wairya, R. Nagaria and S. Jiang, A. Alsheridah, Y. Wang, E. Nagaria, S. Sharma, R. On Nanotechnology, Vol. Navi, R. Moreover, with the explosive growth, the demand, and the popularity of portable electronic products, the designers are driven to strive for smaller silicon area, higher speed, longer battery life, and enhanced reliability.

Adder is the core element of complex arithmetic circuits like addition, multiplication, division, exponentiation, and so forth. There are standard implementations with various logic styles that have been used in the past to design full-adder cells [ 1 — 4 ] and the same are used for comparison in this paper.

Although they all have similar function, the way of producing the intermediate nodes and the transistor count is varied. Different logic styles tend to favor one performance aspect at the expense of the others. The logic style used in logic gates basically influences the speed, size, power dissipation, and the wiring complexity of a circuit.

The circuit delay is determined by the number of inversion levels, the number of transistors in series, transistor sizes i. Circuit size depends upon the number of transistors, their sizes and on the wiring complexity.

Some of them use one logic style for the whole full adder while the other use more than one logic style for their implementation.

Needed this Book. "High Speed CMOS Design Styles".

Power is one of the vital resources, hence the designers try to save it while designing a system. Power dissipation depends upon the switching activity, node capacitances made up of gate, diffusion, and wire capacitances , and control circuit size. At the device level, reducing the supply voltage and reducing the threshold voltage accordingly would reduce the power consumption. Scaling the supply voltage appears to be the well-known means to reduce power consumption.

However, lower-supply voltage increases circuit delay and degrades the drivability of the cells designed with a certain logic style. One of the most significant obstacle in decreasing the supply voltage is the large transistor count and loss problem.

By selecting proper ratio we can minimize the power dissipation without decreasing the supply voltage. To summarize, some of the performance criteria are considered in the design and evaluation of adder cells and some are utilized for the ease of design, robustness, silicon area, delay, and power consumption.

The paper is organized section wise. Section 2 describes the review of full adder circuit topologies. The simulation results are analyzed and compared in Section 6. Finally, Section 7 concludes the paper. Review of Full Adder Topologies In recent years, several variants of different logic styles have been proposed to implement 1-bit adder cells [ 5 — 28 ].

There are two types of full adders in case of logic structure.

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One is static and the other is dynamic style. Static full adders are commonly more reliable, simpler and are lower power consuming than dynamic ones. Dynamic is an alternative logic style to design a logic function. It has some advantages over the static mode such as faster switching speeds, no static power consumption, nonratioed logic, full swing voltage levels, and lesser number of transistors.

This also results in a reduction in the capacitive load at the output node, which is the basis for the delay advantage.

There are various issues related to the full adder like power consumption, performance, area, noise immunity, regularity and good driving ability. Many researchers have combined these two structures and have proposed hybrid dynamic-static full adders. They have investigated different approaches realizing adders using CMOS technology each having its own pros and cons. Full adder circuits can be divided into two groups on the basis of output. The first group of full adders have full swing output. The second group comprises of full adders 10T, 9T and 8T without full swing outputs [ 21 — 28 ].

The nonfull swing full adders are useful in building up larger circuits as multiple bit input adder and multipliers. In section 4, we SR-CPL full adder achieve logic functions of full show the experimental results and make a discussion.

Previous Works on Full Adder Design respectively. The full adder function is to sum two binary operands 2. There are two A.

Impact of Logic Style factors affecting the performance of a full adder The logic style used in logic gates basically design: one is the full adder logic architecture, and influences the speed, size, power dissipation, and the the other is the circuit design techniques to perform wiring complexity of a circuit. The circuit delay is the logic architecture function. Therefore, the full determined by the number of inversion levels, the adder design approach requires using different types number of transistors in series, transistor sizes [3] of logic architecture and circuit design technique to i.

Circuit size depends on the number of should be kept minimal. Another source for transistors and their sizes and on the wiring capacitance reduction is found at the layout level, complexity. Power dissipation is determined by the which, however, is not discussed in this paper.

For that purpose, a logic style should be parameters that also control circuit size. Finally, the robust against transistor downsizing, i. All these characteristics logic.

As far as cell- the choice of logic style are indirectly related through based design techniques e. That is, a logic style logic synthesis are concerned, ease-of-use and providing fast logic gates to speed up critical signal generality of logic gates is of importance as well.

For that purpose, scaling as well as varying process and working a logic style must be robust against supply voltage conditions, and compatibility with surrounding reduction, i.

This becomes a severe problem at very low voltage of around 1 V and lower, where noise margins B. Logic Style Requirements for Low Power become critical.

At the circuit level, large differences are frequency, the node switching activities, the node primarily observed between static and dynamic logic capacitances, the node short circuit currents and the styles. On the other hand, only minor transition number of nodes.

A reduction of each of these activity variations are observed among different static parameters results in a reduction of dissipated power. All the currents also called dynamic leakage currents or other parameters are influenced to some degree by overlap currents may vary by a considerable amount the logic style applied. Thus, some general logic style between different logic styles.The static Majority function bridge design style enjoys a high degree of regularity and symmetric higher density than the conventional CMOS design style as well as lower power consumption by using bridge transistors.

Han and D. In this design, the first majority-not gate is implemented with a high-performance Static CMOS bridge circuit [35]. There are various issues related to the full adders. Dao ,B.

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