This thesis presents two new procedures for constructing differential cvs circuits to perform random logic functions. A short tutorial on cascode logic is now presented in order. Differential cascode voltage switch logic versus conventional logic, ieee j. Dynamic power, static power, low power architecture. A swing restored passtransistor logicbased multiply and.
Background art logic systems of the single ended cascode voltage switch type are described in commonly assigned u. For example, in the scientific american book entitled microelectronics, published in 1977 by. When logic is applied to the pulldown network 4, the operation is vice versa. The idea is to use a dual nblock instead of a dual pblock and a pair of crosscoupled pmos transistors compute the logic function and its complement. Design analysis of full adder using cascade voltage switch logic. High speed cmos design styles provides a survey of design styles in use in industry, specifically in the high speed microprocessor design community. Logic design leverage is achieved in cvsl by cascoding. Jan, 2021 unit ii combinational mos logic circuits circuit families. The mosfet as an amplifier, the mosfet as an electronic switch, the mosfet as a logic inverter 3. High speed arithmetic design using cpl and dpl logic. The first architecture uses transmission gates tg to reduce the logic tree depth and width, which results in speed improvement. With the help of self biased cascode current mirror, the levels of voltage current increases easily than the mirror circuit.
Isscc digest of technical papers, pages 1617, 1984. Modi ed di erential cascode voltage switch logic optimized for subthreshold voltage operation by maarten jonkman a thesis presented to the university of waterloo in ful llment of the thesis requirement for the degree of master of applied science in electrical and computer engineering waterloo, ontario, canada, 2016 c maarten jonkman 2016. A differential cmos logic family proceedings of the ieee int. Abstract differential cascode voltage switch dcvs logic is a cmos circuit technique which has potential advantages over conventional nand nor logicin terms of circuit delay, layout density, power dissipation, and logic flexibility. Differential cascode voltage switch dcvs is claimed to have advantages over the traditional static cmos design in terms of circuit delay, layout area, logic flexibility, and power dissipation 7 8. The basic difference between the pass transistor logic style and cmos logic style is that the source side of the logic transistor is connected to the some input signals instead of the power supply. Weste chap6 circuit families cmos logic gate free 30. Hbd using cascodevoltage switch logic gates for set. The cell has a plurality of devices arranged so as to permit interconnection by metallization wiring to form any of a set of basic logic circuits for interconnection with other such wired cells on the same chip to form a larger circuit, the basic logic circuits being of the two level differential cascode current switch type. It combines the crosscoupled dcvs nature which makes dcvspg have full output swings signal and compact logic design style of. Ec8095 vlsi design regulation 2017 syllabus stucor. Cmos circuit design, layout, and simulation, 3rd edition ucursos. As the data is stored on two storage nodes for each logic gate in this logic family, as opposed to only. The first procedure uses a karnaugh mapping technique and is a very.
This logic family is also known as differential cascode voltage switch logic dcvs or. Cascode voltage switch cvs logic is a cmos circuit technique which has potential advantages over conventional nandnor logic in terms of circuit delay, layout density, power dissipation and logic flexibility. Existing 21 multiplexer dcvsl differential cascode voltage. Hwang, differential cascode voltage switch with pass gate logic tree for high performance cmos digital systems, proc. Are we quite sure that this is about cascode voltage switch logic. These level shifters are tolerant to supply voltages higher than the process limit for individual cmos transistors. Pdf differential cascode voltage switch dcvs logic is a cmos circuit technique that has potential advantages over conventional.
Top pdf fully differential folded cascode amplifiers 1library. Description, cascode voltage switch cvs logic is a cmos circuit technique. This logic family is also known as differential cascode voltage switch logic dcvs. Optimization of dualthreshold independentgate finfets for.
High speed cmos design styles is written for the graduatelevel student or practicing engineer who is primarily interested in circuit design. Differential cascode voltage switch dcvs is a wellknown logic style, which constructs robust and reliable circuits. Singleended cascode voltage switches have been described by hiltebeitel in a technical article cmos xor in the ibm technical disclosure bulletin, vol. In this paper, two procedures are presented for constricting dcvs trees to perform random logic functions. Static cmos, ratioed circuits, cascode voltage switch logic, dynamic circuits, pass transistor logic, transmission gates, domino, dual rail domino, cpl, dcvspg, dpl, circuit pitfalls. By replacing the logic evaluation tree with the passgate design, the. A logic technology that has been gaining widespread acceptance is differential cascode voltage switch dvcs logic. For the recovery and recycle the supplied energy, an ac supply. Differential cascode voltage switch logic dcvsl is a static logic family that. Performance comparison of different circuit using dcvsl. Implementation of differential cascode voltage switch with passgate dcvspg logic for highperformance digital systems, ieee jssc, vol. Differential and passtransistor cmos logic for high performance. Dcvsl, when sized similarly to cmos, su ers from longer delays at nominal voltage.
Us4570084a clocked differential cascode voltage switch. The commonsource cs configuration, quick estimates. Design of low power vlsi circuits using cascode logic style. Exor gate using conventional cmos logic style as well as dcvsl style and. Efficient charge recovery logic ecrl full adder ecrl 6 structure based on crosscoupled pmos transistor and nmos transistors is similar to cascode voltage switch logic cvsl with differential signal, shown in figure 4 and the ecrl full adder circuit is shown in the figure 5. Design and implementation of differential cascode voltage. Implementation of iterative networks with cmos differential logic. Cascode voltage switch logic cvsl refers to a cmostype logic family which is designed for certain advantages. Differential and passtransistor cmos digital circuits. This invention relates to logic systems and more particularly to differential logic systems of the cascode voltage switch cvs type. Pdf design procedures for differential cascode voltage switch. A new family of low power dynamic logic called data driven logic is used. Top pdf fully differential folded cascode amplifiers. Pdf upld and cptl pullup stages for differential cascode.
Detailed table of contents san francisco state university. Cascade voltage switch logic cvsl belongs to class of differential logic types. The first procedure makes use of a karnaugh map and the second. Mos currentmode logic ma05 circuits provide true differential op. In this paper, a new adiabatic logic family named as adiabatic differential cascode voltage switch logic adcvsl for low power applications is. Dec 01, 20 differential cascode voltage switch dcvs is a wellknown logic style, which constructs robust and reliable circuits. This makes the differential cascode voltage switch with passgate tree dcvspg becomes a ratioless circuit. Output signals from the logic modules are sent as a set of twowire pairs, taking on the values 0,0 before starting, and 0,1 or 1,0 after completion. Design procedures for differential cascode voltage switch logic circuits, ieee j. In this paper, two new structures for differential cascode voltage switch logic dcvsl pullup stage are proposed. Free download cmos logic circuit design ebook circuitmix. At the logic level, we apply the switchlevel delay models to formulate delay.
Cascode voltage switch logic circuits ubc library open. The pulldown network implemented by the nmos logic tree generated complementary output. Us4608649a differential cascode voltage switch dcvs master. Lai fs, hwang w 1997 design and implementation of differential cascode voltage switch with passgate dcvspg logic for highperformance digital systems. The differential cascode voltage switch logic dcvsl is a cmos circuit technique which has potential advantages over conventional nandnor logic in terms of power dissipation, circuit delay, layout density and logic flexibility. Simulation results e proposed dcvsl circuits ultralowpower diode differential cascode voltage switch logic ulpddcvsl and. A differential cmos logic family that is well suited to automated logic minimization and placement and routing techniques, yet has comparable performance to. Modeling and optimization of cmos logic circuits with application. Cascode voltage switch logic circuits ubc library open collections.
Griffin ibm general technology division essex junction, vt important criteria for choosing a suitable vlsi logic family include power, delay, logic circuit density, deviceprocess. Pass transistor logic style is more power efficient than the cmos logic style. Logic design leverage is achieved in cvsl by cascoding differential pairs of mos devices into powerful combinational logic tree networks capable of processing complex boolean logic functions within a single circuit delay. Differential cascode voltage switch dcvs logic is a cmos circuit technique which has potential advantages over conventional nandnor logic in terms of circuit delay, layout density, power dissipation, and logic flexibility. Adiabatic differential cascode voltage switch logic adcvsl for.
A wide range level shifter using a self biased cascode. Multifunctional differential cascode voltage switch logic. Adders are the basic building block for all the functional. Differential cascode voltage switch dcvs master slice for high. It is also useful for low voltage analog and mixed mode circuit. In conventional dcvsl structure there lies a drawback which explained lowto. On improving the performance of dynamic dcvsl circuits. The paper presents a new design for full adder by utilizing the cascade voltage switch logic. The proposed hv dcvsl level shifters are particularly useful when it is mandatory to constrain the output using a logic function during out of the. The complementary static logic circuits and differential cascode voltage switch logic circuits based on the proposed ig finfet devices have been verified. Design procedures for differential cascode voltage switch. Dcvs also has an inherent selftesting property which can provide coverage for stuckat and dynamic faults 9. This paper will describe a differential cmos logic family. Finally the output of cptl 1 inverter is connected to the output c.
The smallsignal model, a generalized mosfet circuit 3. Cascode voltage switch logic dcvsl showed that when differential signals are used in the circuits, a compact design, a better noise immunity and, in short, a better gate for this kind of highspeed operation can be obtained. A logic function and its inverse are automatically implemented in this logic style. Performance and variation robustness of nearthreshold.
Two main strategies are studied in this paper to form static dcvsbased standard ternary fundamental logic components in digital electronics. This level shifter circuits are uses self biased cascode current mirror and cmos logic gate. It uses both true and complementary input signals and computes both true and complementary outputs using a pair of nmos pulldown networks, as shown in figure 6. In this paper, a detailed comparison of all the dcvsl structures are provided including the implementation of full adder circuit with the help of those dcvsl. Ep0220459a2 differential cascode voltage switch logic. Differential cascode voltage switch dcvs strategies by cntfet.
Modi ed di erential cascode voltage switch logic optimized. In computer engineering, a logic family may refer to one of two related concepts. Voltage switch with passgate dcvspg logic for highperformance digital systems fangshi lai and wei hwang, senior member, ieee abstract in this paper, a new highspeed circuit technique called differential cascode voltage switch with passgate dcvspg logic tree is presented. Highperformance digital logic circuit realization using. Cascode voltage switch logic circuits chu, kan man 1986. Also, as a consequence of the differential signals, which means an effective doubling of the voltage. Two procedures are presented for constructing dcvs trees to perform random logic functions. Cascode voltage switch logic cvsl seeks the performance of ratioed circuits without the static power consumption. Sample circuit diagram coming as soon as i find a good application to draw it with. This book is organized so that it can be used as a textbook or as a reference book. This paper will describe a differential cmos logic family cascode voltage switch logic cvsl.
A logic decision node in the master stage is precharged during the low phase of the clock and conditionally discharged during an evaluation period triggered by the rising clock edge. Dcvs also has an inherent selftesting property which can provide. Differential cascode voltage switch dcvs logic is a cmos circuit technique which has potential advantages over conventional nandnor logic in terms of. The circuit technique is designed using a passgate logic tree. Such logic can be implemented using differential cascode voltage switch logic dcvsl. A novel methodology to reduce leakage power in differential cascode vol. Hbd using cascodevoltage switch logic gates for set tolerant. As we lower the voltage of both cmos and dcvsl, both circuits slow down signi cantly but also use proportionately less power. In pass transistor logic, the transistors are used as voltage controlled switches to. It requires mainly nchannel mosfet transistors to implement the logic using true and complementary input signals, and also needs two pchannel transistors at the top to pull one of the outputs high.
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