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017
International Journal of
VLSI Design and Technology
JUL–DEC 2016 IJVDT
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Basic MOS models, spice models
Frequency response stability and noise issues in amplifiers
CMOS analog blocks: current sources and voltage references
Differential amplifier op-amp and ota design
Frequency synthesizers and phased lock-loop
Non-linear analog blocks: comparators, charged-pump circuits and multipliers
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Electronic design automation
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From the Editor's Desk
Dear Readers,
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International Journal of VLSI Design and Technology focuses on original high-quality research in the realm
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in amplifiers, CMOS analog blocks: Current Sources and Voltage references, Differential amplifier, OPAMP
and OTA design, Frequency Synthesizers and Phased lock-loop, Non-linear analog blocks: Comparators,
Charged-pump circuits and Multipliers, Data converters, Analog Interconnects and Analog Testing and
Layout, 12 Low voltage and Low power Analog, Electronic design automation.
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research into the vibrant area of Electronics and Telecommunication Engineering.
Puneet Mehrotra
Managing Director
1. Energy Efficient Low-Voltage Dynamic Comparator S.K. Jain, C. Periasamy 1
2. Design and Analysis of 8T Full Adder Using 77 nm Technology M. Agnihotri, D. Bichwe 7
3. Temperature Dependent Performance Analysis of SWCNT Bundles as VLSI InterconnectsShilpa Agrawal, Ankit Kumar, Mayank Kumar Rai, Abhishek Shrivastava 11
4. Multilevel CMOS LDO-Voltage Circuit With Bi-CMOS LDO With and Without AmplifierKamlesh Sharma, Gajendra Sujediya, Abdul Naim Khan 18
5. Comparative Study of a 32 Bit Vedic Multiplier With a Conventional Binary MultiplierRohan Muley, Amrita Tuteja 26
Contents
IJVDT (2016) 1-6 © JournalsPub 2016. All Rights Reserved Page 1
International Journal of VLSI Design & Technology Vol. 2: Issue 2
www.journalspub.com
Energy Efficient Low-Voltage Dynamic Comparator
S.K. Jain*, C. Periasamy
Malviya National Institute of Technology, Jaipur, India
ABSTRACT
The blueprint of a comparator that is doubly tailed and with minimal voltage post amplifier
and stage of latching are explained deeply in this document. The main concern of the design
is in the comparator of traditional modes those are doubly tailed. The circuitry which is
traditionally doubly tailed is manipulated as per the need of minimal power and enhanced
operation in voltages with very minutes supply. In the technique of CMOS of 45 nm the
outcomes of simulation ensures the outcomes of assessments. It is also presented that by
minimizing the extent of channel, the absorption of power will also be deduced. The voltage
of 1.2 V that is furnished is absorbed as 4.11 μW in the comparator suggested here while it is
39.05 and 136.55 μW in the comparators those are currently in use.
Keywords: conventional dynamic comparator, double tail comparator, proposed dynamic
comparator, low power, fast operation
INTRODUCTION
Comparators are constituted as the main
formulation cells of an ADC. The ADCs
which possess a greater speed like the
flash tends for greater frequency, minimal
power along the area of chip. The
comparators that have a greater speed that
are deployed in methodology of UDSM-
CMOS face paucity of voltage when the
voltage thresholds are taken into account
in the appliances which had not been
deployed at a same level of furnished
voltage in the latest CMOS. So in the issue
of shortage in voltage, to form a
comparator that possesses a greater speed
is much more exigent. In order to
recompense the deducing voltage to attain
more speed some bigger transistors are
deployed which eventually demand for
greater section of die & power. The
outcomes obtained should be in the same
mode of input even a minimal voltage is
supplied in the structures of ADC that has
greater speed. There are several
methodologies like the boosting, the
transistors are driven by body, design of
mode of current and by making use of
process of double oxide which can manage
the supply of greater voltages which is
been deployed to attain the issues of
minimal voltages. The bootstrapping and
boosting are two methodologies which are
constituted in furnishing the supply,
voltage of clock and reference which will
be defined for a range of input and issues
of switching. These methodologies that put
a real impact, but they face some problems
in their accuracy in CMOS-USDM
terminologies. The methodologies that are
adopted by Blalock, they eliminate the
voltage of threshold like MOSFET driven
of body as an appliance that is of type of
exhaustion. A subsidiary modulator is
suggested on the terminologies which 1 bit
quantized.[1–3]
Apart from its superiorities
the transistors which are driven by body
bear some minute conductance in trans in
contrast to the {counterparts} in the
procedural {fabrication} like in all the
transistors which are constituted on the
IJVDT (2016) 7-10 © JournalsPub 2016. All Rights Reserved Page 7
International Journal of VLSI Design and Technology Vol. 2: Issue 2
www.journalspub.com
Design and Analysis of 8T Full Adder Using 77 nm Technology
M. Agnihotri1*, D. Bichwe
2
1Department of Electronics and Communication Engineering, Prashanti College of Engineering and
Technology, Ujjain, MP, India 2Department of Electronics and Communication Engineering, Guru Nanak Institute of Engineering and
Technology, Nagpur, India
ABSTRACT
The 8T full adder design has been proposed in this paper. The proposed design is based on
77nm technology. The power consumption by this design is reduced due to less number of
transistor count and efficient area is also get reduced by this proposed design. The design is
simulated with the help of Tanner tool. The simulation results are compared with the
conventional full adder design in terms of power consumption, area, time delay and power
delay product parameters.
Keywords: carry, full adder, 77nm technology, sum, transistor count
INTRODUCTION
Research efforts in the field of low power
VLSI (very large-scale integration)
systems have been increased due to
exponential growth of portable electronic
devices like laptops; audio/video based
multimedia and cellular communication
devices.[1]
With the increase in number of
transistors on chip, power consumption of
the VLSI systems is also increasing which
further increase to run time failures and
reliability problems. The packaging and
the cooling mechanism becomes more
costly with excessive power consumption.
Low power consumption is one of major
design criteria for IC designers at all levels
of design along with the delay and area
considerations. Proper functionality of
electronic device at low supply voltage is
also important consideration. In this paper,
we proposes a full adder design using less
number of transistor is to reduce power
consumption, less area, less power delay
and less power delay product.
PREVIOUS WORK
The full adder is basically 1 bit adder used
to perform arithmetic addition. It contains
three input bits like A, B, Cin and two
output bits Sum and Carry. The Boolean
expression for the Sum and Carry
functions is as shown below.
Sum = (AB)Cin
Cout = A.B + Cin (AB)
The conventional full adder circuit
contains much number of transistors. The
PMOS transistor acts as Pull up and
NMOS transistor acts as Pull down
transistor. It is very robust design but due
to more power consumption and more
number of transistor count, it not mainly
used in digital design. Figure 1 shows the
conventional transistor.
There are many proposed design for full
adder circuit. In recent years the different
types of full adder using various logic
styles have been proposed. Standard
CMOS 28 transistor adder having pull up
IJVDT (2016) 11-17 © JournalsPub 2016. All Rights Reserved Page 11
International Journal of VLSI Design and Technology Vol. 2: Issue 2
www.journalspub.com
Temperature Dependent Performance Analysis of SWCNT
Bundles as VLSI Interconnects
Shilpa Agrawal*, Ankit Kumar, Mayank Kumar Rai, Abhishek Shrivastava Department of Electronics and Communication Engineering, Thapar University, Patiala, India
ABSTRACT
Impact of temperature on delay in single walled carbon nanotube (SWCNT) bundle
interconnects has been analyzed. Temperature-dependent circuit model for metallic SWCNT
bundle is developed. The obtained results are matched with currently used copper
interconnects at 22 nm technology node. It is seen that SWCNT bundle interconnects are of
lower delay than copper interconnect with rise in temperature from 300K to 450K.
Keywords: carbon nanotube, delay analysis, interconnects, single walled carbon nanotube
INTRODUCTION
Due to scaling in die size, performance of
the copper based interconnects for global
signaling get debased due to the decrease
in conductivity of copper. In deep
submicron level, grain boundary scattering
and electron migration dominates
effectively.[1]
Material research lies out
that carbon nanotube (CNT) is a potential
candidate. CNTs are graphene tubes,
having diameter in range of nanometer,
formed by folding up graphene sheets of
carbon atoms with a proper chirality.[2]
Interconnects configured of these medium
are executed in an identical size scale as
the copper wires. CNTs have significant
lower resistivity than copper because of
the property of CNT that it has high
electron mean free path than the copper.[3–
5] Moreover a CNT wire can accommodate
a current density of 1010 A/cm2 or higher
value without any destruction.[6]
On the basis of structure CNTs are divided
into two groups: single-wall carbon
nanotubes (SWCNTs) and multi-wall
carbon tubes (MWCNTs).SWCNTs are
made up of single thin wall of graphene
sheet while MWCNTs are made up of
several concentric shells. On the basis of
conductivity CNTs are divided into two
groups: semiconducting CNTS (sCNTS)
and metallic CNTs (mCNTs) depending on
their chirality. Semiconducting CNTs are
used to form transistors whereas metallic
CNTs are used as interconnects.
Single tube of SWCNT has large
resistance due to which more than one
SWCNT, called as SWCNT bundle, are
combined parallel. By using SWCNT
Bundles, overall resistance is reduced and
it entitle CNT interconnect to be more
appropriate for copper interconnects at
advanced VLSI technology nodes.
The main objective of this study is to
develop the impedance parameters of
SWCNT bundles based interconnect as a
function of temperature.
This paper analyses the effect of
temperature variation on delay on SWCNT
bundle interconnect.
IJVDT (2016) 18-25 © JournalsPub 2016. All Rights Reserved Page 18
International Journal of VLSI Design and Technology Vol. 2: Issue 2
www.journalspub.com
Multilevel CMOS LDO-Voltage Circuit With Bi-CMOS LDO
With and Without Amplifier
Kamlesh Sharma1, Gajendra Sujediya
2, Abdul Naim Khan
3*
1,2Rajasthan Institute of Engineering & Technology, Jaipur, India
3Jaipur National University, Jaipur, India
ABSTRACT An amplifier is a device that is use to amplify the signal strength. There are lots of amplifiers
that can do other task besides amplifying. An amplifier is basically increasing the power level
of signals. We can use this principal to make building block of radio system. The signals that
we actually amplify in radio system are not necessarily sine wave, but sometimes they are.
Here we are amplifying sine wave of AC voltage or current. In this paper, the purpose is on
setting up a CMOS LDO (Low Drop Out) voltage circuit that can deliver significant voltage
drop & regulated voltage at multi-level ports that can enable SOC or NOC which have only
single power supply along with single power distribution circuit.
Keywords: CMOS, low dropout, NoC, SoC, voltage regulator
INTRODUCTION
Complementary Metal Oxide
Semiconductor (CMOS) is the
semiconductor technology used in the
transistors that are manufactured in to
most of today's computer microchips.
Semiconductors are made of silicon and
germanium, materials which "in some
way" conduct electricity, but not much
more.[1]
LDOs (Low dropout regulators)
are a simple inexpensive way to regulate
an output voltage that is to be powered
from a higher voltage input. They are easy
to design with and use. For most of the
applications, the parameters in an LDO
(Low dropout regulators) datasheet are
usually very easy to understand. Although,
the other applications require the designer
to study the datasheet more closely to
check whether or not the LDO is suitable
for the specific circuit conditions.[2]
Unfortunately, datasheets can’t present all
the parameters under all possible operating
conditions. The designer must interpret
and extrapolate the obtained information to
check the performance under non-
specified conditions.
LITERATURE REVIEW
In this paper, a CMOS without capacitor
LDO controller, which utilizing an
unobtrusive inclination circuit and a huge
number rate upgrade circuit, is planned.
These papers introduced an approach to
uproot the substantial outside capacitor,
yet these sans capacitor LDO controllers
experience the ill effects of unavoidable
tradeoffs between the precision and
criticism security.[3]
A low voltage, low
dropout (LDO) controller with an over
current redesign circuit is proposed in this
paper. By shaft zero following recurrence
remuneration; it can accomplish security
without ESR. It gives an over current sign
with hysteretic capacity. It comprises of a
voltage mention, a PMOS pass component,
a mistake intensifier in input design used
to initiative the pass component, security
circuits and stacking components.[4]
This
paper gives an outline of dependability
IJVDT (2016) 26-29 © JournalsPub 2016. All Rights Reserved Page 26
International Journal of VLSI Design and Technology Vol. 2: Issue 2
www.journalspub.com
Comparative Study of a 32 Bit Vedic Multiplier With a
Conventional Binary Multiplier
Rohan Muley*, Amrita Tuteja MIT, Ujjain, Madhya Pradesh, India
ABSTRACT
Multiplier plays a very important role in digital signal processing systems. To achieve high
speed operation, Vedic method has been adopted in VLSI technology. Multipliers using vedic
mathematics produces high evaluation results in terms of speed and device utilization. The
aim of this work is to design digital multipliers based on the idea of Vedic mathematics. In
order to implement a digital multiplier, Urdhva-tiryakbyham sutras of Vedic mathematics are
used to develop vertical and cross wise operations. After all these are digital multiplier, so
that they are implemented on FPGA board and tested through the 8 LED (s) in FPGA (Nexys
3). An implemented 32-bit Vedic multiplier has been simulated in Xilinx ISE 13.4 and
compared with a 32-bit binary multiplier.
Keywords: binary multiplier, DSP, vedic multiplier, VLSI
INTRODUCTION
In today's era more emphasis is given on
the signal processing applications in VLSI.
Since last two decades, work on Multiply
and Accumulate (MAC) have been in
order to improve the multiplication
techniques. But before to improve the
multiplication technique need to focus on
why multiplication is important factor in
arithmetic operations and what is this.
Multiplication is an important basic
function in arithmetic operations.
Multiplication-based operations such as
Multiply and Accumulate(MAC) and inner
product are among some of the repeatedly
used Computation- Intensive Arithmetic
Functions(CIAF) currently designed in
many Digital Signal Processing (DSP)
applications such as convolution, Fast
Fourier Transform (FFT), filtering and in
microprocessors in its arithmetic and logic
unit [1]. Since multiplication dominates
the execution time of many DSP
algorithms, so there is a need of high speed
multiplier. When we talk of multiplication
the first thing that strikes is
“Mathematics”.
Researchers prefer the ancient
methodology for any mathematical
application where sutras are used i.e.
“Vedic Mathematics.” Vedic Mathematics
is based on 16 sutras (aphorisms) namely
(Anurupye) Shunyamanyat, Chalana-
Kalanabyham, Ekadhikina Purvena,
Ekanyunena Purvena, Gunakasamuchyah,
Gunitasamuchyah, Nikhilam
Navatashcaramam Dashatahm,
Paraavartya Yojayet, Puranapuranabyham,
Sankalanavyavakalanabhyam,
Shesanyankena Charamena,
ShunyamSaamyasamuccaye,
Sopaantyadvayamantyam,
Urdhvatiryakbyham, Vyashtisamanstih
and Yaavadunam.[2]
Each of these sutras is used for specific
application, for example Nikhilam sutra is
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Article 2
017
International Journal of
VLSI Design and Technology
JUL–DEC 2016 IJVDT
www.journalspub.com