This thesis presents two new procedures for constructing differential cvs circuits to perform random logic functions. Dcvsl, when sized similarly to cmos, su ers from longer delays at nominal voltage. Acronym abbreviationslang dcvsl means differential cascade voltage switch logic. 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. How is differential cascode voltage switch logic circuit abbreviated. This thesis investigates the problem of implementing logic with dcvs, and in. The circuit technique is designed using an nchannel multipleinput fgmos pull down logic tree instead of the nmos logic tree in the conventional enhanced differential cascode voltage. Dcsl is in principle a clocked differential cascode voltage switch logic circuit dcvs. Jul 26, 1988 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. Differential cascode voltage switch logic, dcvs 12 dcvs or differential cvsl cvsl provides for dualrail logic gates, and the out results f and f are held until the inputs induce a change a andnand. Pdf optimal synthesis of differential cascode voltage.
Differential and passtransistor cmos digital circuits. The first procedure makes use of a karnaugh map and the. Promoting resistors in dcvslr structure increase the parasitic effects and unavoidable delay and it also occupies. Despite the inevitable trend towards lowvoltage, few books address the technology needed. This thesis investigates the problem of implementing logic with dcvs, and in particular, the. Introduction to digital integrated circuits ee141 infn. Switch logic types of switches department of computer.
The first procedure makes use of a karnaugh map and the second. Switch logic can implement boolean formulas as networks of switches. To overcome the leakage of weakly conducting pmos transistors, drive strength of nmos transistor is enhanced. Digital integrated circuits combinational logic prentice hall 1995 combinational logic. Twolevel differential cascode current switch masterslice. A new low power adiabatic logic family, passtransistor adiabatic logic with nmos pulldown configuration, is presented. Graduate thesis or dissertation comparison and analysis.
Inverter, nand gate, combinational logic, nor gate, compound gates, pass transistors and transmission gates, tristates, multiplexers, latches and flipflops, circuit families. Selection transistors 44, 46, 48 connected to each logic block 18, 40, 42 complete the conductivity path to ground. We present a new logic family, differential current switch logic dcsl for implementing clocked cmos circuits. The circuit is in principle a differ ential cascode voltage switch logic circuit dcvs. The result is a high speed cmos to ecl conversion circuit with relatively high logic density. In cornparimson to other forms of clocked dcvs, dcsl achieves better performance both. Andnand gate in cascode voltage switch logic cvsl 14, the variation on the power consumption can be as large as 50% 10. Differential cascade voltage switch logic how is differential cascade voltage switch logic abbreviated. Static cmos, ratioed circuits, unit vi cascode voltage switch logic, dynamic circuits, differential circuits, sense amplifier. Edn old electronics books scanned and free online in pdf format. Two main strategies are studied in this paper to form static dcvsbased standard ternary fundamental logic components in digital electronics. A new logic family, differential current switch logic dcsl for implementing clocked cmos circuits has been developed. This level shifter circuits are uses self biased cascode current mirror and cmos logic gate. The logic design strategic is achieved in cvsl by cascading differential pairs of fet devices are capable of processing boolean functions up to 2n1 input.
Differential cascode voltage switch dcvs logic is a dynamic logic family that has a number of desirable properties. Static and dynamic cmos cascode voltage switch logic circuits. The operating range of cc lss depends only on the transistor threshold voltage vt and size. Promoting resistors in dcvslr structure increase the parasitic effects and unavoidable delay and it also occupies more area on the chip. Edn old electronics books scanned and free online in pdf. Differential cascode voltage switch dcvs is a wellknown logic style, which constructs robust and reliable circuits. Simple transistor circuits generate phantastron sweeps 84. Dec 29, 2008 cascode circuit compensates for heater voltage sensitivity 84. Dance company at virginia tech student organization deep cerebral vein thrombosis. Switch logic types of switches sharif university of. Differential cascode voltage switch logic circuit dcvs. Two procedures are presented for constructing dcvs trees to perform random logic functions.
Comparison of cmos circuit techniques differential cascode voltage switch. The first procedure uses a karnaugh mapping technique. Compared to passtransistor adiabatic logic using single powerclock supply pal, the tristate problem is solved, while power consumption is. In this paper, a new logic style, enhanced differential cascode voltage switch logic edcvsl, is presented for high performance and low power vlsi. A wide range level shifter using a self biased cascode.
A differential cmos logic family that is well suited to automated logic minimization and placement and routing techniques, yet has comparable performance to conventional cmos, will be described. 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. 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. Differential current switch logic dcsl, a new logic family for implementing clocked cmos circuits, has been developed. The circuit topology outlines a generic method for reducing internal node swings in clocked. The circuit consists of a cmos differential logic circuit and a bipolar differential sense pair. As we lower the voltage of both cmos and dcvsl, both circuits slow down signi cantly but also use proportionately less power.
In order to increase the switching speed, and thus to reduce the delay times, the w l ratios of all transistors in the circuit are to be increased. Vlsi system curriculum for students admitted in 2018. A differential cascode voltage switch dcvs logic circuit in which different dcvs logic blocks 18, 40, 42 are connected in parallel to the output lines 14,16. Chu anddavid i pulfrey, member,ieee abstract differential cascode voltage switch dcvs logic is a cmos circuit technique which has potential advantages over conventional nand. Differential cascode voltage switch listed as dcvs. The effect of voltage and device scaling on these topologies is evaluated in terms of average delay, power dissipation at maximum frequency, powerdelayproduct and. Differential cascode voltage switch logic dcvsl is a differential style derived from conventional cmos logic and ratioed pseudo nmos logic. This permits the design of any combinational logic function by the use of a kmap or by a modified quinemccluskey algorithm. A new family of low power dynamic logic called data driven logic is used. Technology mapping and layout synthesis of dcvs ubc library. These devices usually ran off a 15 volt power supply and were found in industrial control, where the high. Differential logic cascode voltage switch logic cvsl aka, differential logic performance advantage of ratioed circuits without the extra power requires complementary inputs produces complementary outputs operation two nmos arrays o ferno f, one for f pdmaoos ldelpuocsscor one path is always active.
Design of enhanced differential cascode voltage switch. Differential cascode voltage switch how is differential. The advantages of fscl are low switching noise and high operating speed. This paper presents a dual rail logic network based static and dynamic cmos cascode voltage switch logic cvsl circuits for improving the functional efficiency and low power consumption. This logic family is also known as differential cascode voltage switch.
The basic design approach used is based on pass logic and shows that a dcvspg logic gate. In terms of overall pdp, subcmos shows to be the best option and subcpl, subdomino and subdcvsl differential cascode voltage switch logic styles almost have a similar energy consumption. Voltage switch logic cptldcvsl are simulated using the cadence and the model parameters of a nm cmos technology. Pass transistor logic style is more power efficient than the cmos logic style. Noise types of noise, representation of noise in circuits, noise in single stage amplifiers, noise in differential pairs. Differential cascode voltage switch logic versus conventional logic article pdf available in ieee journal of solidstate circuits sc224. The technique sends the same electrical signal as a differential pair of signals, each in its own conductor. Common gate stage, cascode stage, differential pair.
Di erential logic has improved ultralow voltage performance over static cmos logic and the modi cation to dcvsl o ers a logic structure that can implement multiinput andnand and ornor gates while maintaining a. Ep0220459a2 differential cascode voltage switch logic. Cascode voltage switch logic, dynamic circuits, pass transistor circuits. Pulfrey, comparison of cmos circuit techniques differential cascode voltage switch logic versus conventional logic, ieee j. Design method for constant power consumption of differential. In conventional dcvsl structure, lowtohigh propagation delay is larger than hightolow propagation delay this could be brought down by using dcvslr. Optimal synthesis of differential cascode voltage switch dcvs logic circuits using ordered binary decision diagrams obdds. In cornparimson to other forms of clocked dcvs, dcsl achieves better performance both in terms. Technology mapping and layout synthesis of dcvs ubc. Differential cascode voltage switch logic circuit distributed concurrent versioning system computer program doubly committed subarterial ventricular septal defect. Lowvoltage very large scale integration vlsi circuits represent the electronics of the future. The circuit topology outlines a generic method for reducing internal node swings in clocked dcvs logic circuits.
Dcvsl differential cascade voltage switch logic in. Differential cascade voltage switch logic listed as dcvsl. Dcvs logic dcvsl differential cascode voltage logic static logicconsumes no dynamic power uses latch to compute output quickly requires truecomplement inputs produces truecomplement outputs. Differential signaling is a method for electrically transmitting information using two complementary signals. Simulation results of a test circuit are presented and indicate that this logic gate is competitive with ecl in terms of.
This thesis describes the analysis and comparison of folded sourcecoupled logic fscl with standard static cmos, cascode voltage switch logic and differential splitlevel logic gates. In this paper, a formal design approach for the differential cascode voltage switch with pass gate dcvspg logic is presented. The logic circuit presented in this thesis is a modi ed implementation of di erential cascade voltage switch logic dcvsl. Dcvs stands for differential cascode voltage switch logic circuit. A variant of dtl called highthreshold logic incorporated zener diodes to create a large offset between logic 1 and logic 0 voltage levels. Depending on the input, different parasitic capacitances that are internal to the differential pull down network discharge during the evaluation phase. Oklobdzijareferences used for creation of the presentation material.
Only one selection transistor 44, 46, 48 is selected at a time to thereby select the associated logic. Cascode voltage switch logic circuits ubc library open. Ulpd and cptl pullup stages for differential cascode. All electronic products are striving to reduce power consumption to create more economical, efficient, and compact devices.
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. Cascode circuit compensates for heatervoltage sensitivity 84. These devices usually ran off a 15 volt power supply and were found in industrial control, where the high differential was intended to minimize the effect of noise. Cascode voltage switch logic cvsl refers to a cmostype logic family which is designed for certain advantages. Design procedures for differential cascode voltage switch. A bicmos differential cascode voltage switch logic dcvsl gate is presented. Usersdtranahdocumentsrecovered itemsbooks jhorowitz. Static and dynamic cmos cascode voltage switch logic. Design of enhanced differential cascode voltage switch logic. Differential cascode voltage switch dcvs strategies by. Dichotic consonantvowel task linguistics dynamic card verification value. Dcvs is defined as differential cascode voltage switch logic circuit somewhat frequently.
Ulpd and cptl pullup stages for differential cascode voltage. Performance and variation robustness of nearthreshold. 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. Lecture 19 free download as powerpoint presentation. For 4tsdg option, in terms of power consumption, subcpl and subdomino logic styles shows to be better and all others have almost similar power consumption. Design procedures for differential cascode voltage switch circuits abstract. Dcvs logic dcvsl differential cascode voltage logic static logicconsumes no dynamic power. The pair of conductors can be wires typically twisted together or traces on a circuit board. Dcvs differential cascode voltage switch logic circuit. Modi ed di erential cascode voltage switch logic optimized. Dcvsl differential cascade voltage switch logic acronymfinder. In particular, it is hazardfree, easy to make fully robust path delayfault testable, and has a number of unique timing properties that make it very suitable for selftimed circuits. Citeseerx document details isaac councill, lee giles, pradeep teregowda. Graduate thesis or dissertation comparison and analysis of.
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