مجال
التميز
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تميز دراسي و بحثي
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البحوث المنشورة
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البحث (1):
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عنوان البحث:
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Design of a High Performance 5.0 GHz Low
Phase Noise0.35μm CMOS Voltage Controlled Oscillator
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رابط إلى البحث:
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Click here
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تاريخ النشر:
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12/1/2013
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موجز عن البحث:
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This paper describes how a novel low phase noiseFigure
of Merit (FOM), LC-tank voltage-controlled oscillator (VCO) is presented. The
work presents a fully integrated 5.0GHz VCO designed in a 0.35μm CMOS
process. The proposedVCO features a worst-case phase noise of -133.07 dBc/Hz
and -136.31 dBc/Hz at 600 kHz and 1 MHz frequency offset. Anoptimization
technique is used to design the excellent FOM.The FOM is -206. 20 dBc/Hz. It
features a supply of 2.4 V, acore of only 1.0 mA.
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البحث (2):
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عنوان البحث:
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A Wideband Gain Linearized Microwave Voltage
Controlled Oscillator with Low Phase Noise Variation in Nanometer CMOS
Technology
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رابط إلى البحث:
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Click
here
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تاريخ النشر:
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30/01/2015
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موجز عن البحث:
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A wideband CMOS LC tank voltage-controlled
oscillator (VCO) with low phase noise variations and a linearized gain has
been designed using a new binary-weighted switched-capacitor and
digitally-controlled varactor bank. The novel design has the advantages of
more linear VCO frequency tuning, lower phase noise and reduced gain to
variations in supply voltage. The proposed VCO has been designed using UMC
90-nm, 6-metal CMOS technology and features phase noise variation of less
than 4.9 dBc/Hz. The VCO operates from 3.45 to 6.55 GHz, with phase noise of
-133.4 dBc/Hz at a 1 MHz offset, a figure of merit (FoM) of -203.3 dBc/Hz,
less than 41 dBm spurious harmonics, and a total VCO core current consumption
of 1.18 mA from a 3.3 V voltage supply. To the authors’ knowledge, this is
the lowest phase noise variation ever reported.
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البحث (3):
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عنوان البحث:
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Electromagnetic interference shielding based
on highly flexible and conductive graphene laminate
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رابط إلى البحث:
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here
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تاريخ النشر:
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20/08/2015
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موجز عن البحث:
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The potential of highly flexible and
conductive graphene laminate is extended to the application of
electromagnetic interference shielding. Graphene nanoflake-based conductive
ink is printed on paper, and compressed to form a graphene laminate with a
conductivity of 0.43 × 105 S/m. The shielding effectiveness is
experimentally measured to be above 32 dB between 12 and 18 GHz, even though
the thickness of the graphene laminate is only 7.7 µm. It is demonstrated
that graphene has great potential in offering lightweight, low-cost, flexible
and environmentally-friendly shielding materials.
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البحث (4):
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عنوان البحث:
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Highly Flexible and Conductive Printed
Graphene for Wireless Wearable Communications Applications
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رابط إلى البحث:
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Click here
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تاريخ النشر:
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17
December 2015
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موجز عن البحث:
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In this paper, we report highly conductive,
highly flexible, light weight and low cost printed graphene for wireless
wearable communications applications. As a proof of concept, printed graphene
enabled transmission lines and antennas on paper substrates were designed,
fabricated and characterized. To explore its potentials in wearable
communications applications, mechanically flexible transmission lines and
antennas under various bended cases were experimentally studied. The
measurement results demonstrate that the printed graphene can be used for RF
signal transmitting, radiating and receiving, which represents some of the
essential functionalities of RF signal processing in wireless wearable
communications systems. Furthermore, the printed graphene can be processed at
low temperature so that it is compatible with heat-sensitive flexible
materials like papers and textiles. This work brings a step closer to the
prospect to implement graphene enabled low cost and environmentally friendly
wireless wearable communications systems in the near future
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البحث (5):
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عنوان البحث:
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Design of broadband
and tunable terahertz absorbers based on graphene metasurface: equivalent
circuit model approach
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رابط إلى البحث:
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here
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تاريخ النشر:
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19/03/2015
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موجز عن البحث:
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This study presents
an effective method to model, analyse and design graphene metasurface-based
terahertz (THz) absorbers using equivalent circuit model approach. Broadband
and tunable absorbers consisting of graphene metasurface and metal-backed
dielectric layer have been designed based on the formulas derived from this
approach and verified by full-wave electromagnetic simulation. By properly
constructing the graphene metasurface, broadband absorption over 70% fraction
bandwidth has been achieved, showing that graphene can provide a wideband
absorption in the low THz spectrum. Furthermore, tunability of the graphene
metasurface has also been investigated. It is demonstrated that the
absorption peak frequencies can be tuned while maintaining the peak
absorption unchanged, which is highly desirable for THz sensing applications.
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المؤتمرات العلمية:
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المؤتمر (1):
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عنوان المؤتمر:
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2013 International
Conference on Communication and Electronics Information (ICCEI 2013)
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تاريخ الإنعقاد:
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12-13/1/2013
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مكان
الإنعقاد:
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Bruxelles. Belgium
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طبيعة المشاركة:
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Oral presentation
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عنوان المشاركة:
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Design of a High Performance 5.0 GHz Low
Phase Noise0.35μm CMOS Voltage Controlled Oscillator
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ملخص المشاركة:
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This paper describes how a novel low phase
noiseFigure of Merit (FOM), LC-tank voltage-controlled oscillator (VCO) is
presented. The work presents a fully integrated 5.0GHz VCO designed in a
0.35μm CMOS process. The proposedVCO features a worst-case phase noise of
-133.07 dBc/Hz and -136.31 dBc/Hz at 600 kHz and 1 MHz frequency offset.
Anoptimization technique is used to design the excellent FOM.The FOM is -206.
20 dBc/Hz. It features a supply of 2.4 V, acore of only 1.0 mA.
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المؤتمر (2):
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عنوان المؤتمر:
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2nd International
Conference on Computer Science and Electronics Engineering (ICCSEE 2013)
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تاريخ الإنعقاد:
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22-24/3/2013
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مكان
الإنعقاد:
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Hangzhou, China
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طبيعة المشاركة:
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Paper presentation
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عنوان المشاركة:
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Design of a High Performance 5.2 GHz Low
Phase Noise Voltage Controlled Oscillator Using 90nm CMOS Technology
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ملخص المشاركة:
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In this paper, a novel Figure of Merit (FOM),
low phase noise, LC-tank voltage-controlled oscillator (VCO) is presented.
The work presents a fully integrated 5.2 GHz VCO designed in a 90nm CMOS
process. The proposed VCO features a worst-case phase noise of -130.10dBc/Hz
and -133.00 dBc/Hz at 600 kHz and 1 MHz frequency offset from 5.2GHz carrier
is achieved. An optimization technique is used to design the excellent FOM.
The FOM is -206.02dBc/Hz. It features a supply voltage of 2.7 V, with a core
of only 0.5 mA.
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المؤتمر (3):
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عنوان المؤتمر:
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2015 IEEE International
Conference on Integrated Circuit Design and Technology
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تاريخ الإنعقاد:
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01/06/2015
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مكان
الإنعقاد:
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Belgium
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طبيعة المشاركة:
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Paper presentation
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عنوان المشاركة:
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Low-Phase Noise Variation VCO Implementing
Resistorless Digitally Controlled Varactor
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ملخص المشاركة:
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A novel resistorless digital capacitor
switching array (DCSA) has been implemented into a wideband CMOS VCO for
5-GHz WiMAX/WLAN applications. The proposed DCSA is added both in series and
parallel to nMOS varactors. Based on this, a wideband VCO is achieved, which
not only exhibits lower phase noise in comparison with reported state-of the-
art wideband VCOs, but also has low phase noise variation of less than 5
dBc/Hz. In addition, it has demonstrated low power consumption, improved
linearity of the f-V curve and extended tuning range. The proposed VCO has
been designed using UMC 130 nm CMOS technology. It operates from 3.65 GHz
to 6.34 GHz, with a phase noise of
-132.70 dBc/Hz at 1 MHz offset, a figure of merit (FoM) of -202.9 dBc/Hz,
less than -41 dBm spurious harmonics and total VCO core power consumption of
2.88 mW from a 3.2 V supply voltage.
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المؤتمر (4):
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عنوان المؤتمر:
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15th International
Conference on Nanotechnology (IEEE NANO 2015)
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تاريخ الإنعقاد:
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26-3/ 07/2015
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مكان
الإنعقاد:
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Rome. Italy
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طبيعة المشاركة:
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Oral presentation
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عنوان المشاركة:
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Wide Tuning Range Voltage Controlled
Oscillator (VCO) with Minimized Phase Noise Variation in Nanoscale CMOS
Technology
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ملخص المشاركة:
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A cross-coupled differential VCO with low
phase noise variation is presented. The VCO core adopts a metal-oxide-metal
(MOM) digital switching capacitor array (DSCA), which is connected in series
and in parallel to the nMOS varactor in order to reduce the KVCO variation.
For further gain linearity, wider tuning range and minor phase noise
variations, this varactor bank is connected in parallel to three nMOS
varactor pairs. Each pair is biased at a different voltage. The proposed VCO
has been designed and implemented in UMC 130-nm, 6-metal CMOS technology and
operates from 3.45 GHz to 6.23 GHz with 55.6% tuning range, phase noise
variations ranging between -134 dBc/Hz and -130.8 dBc/Hz and power
consumption below 6 mW at supply voltage of 3.2 V. The simulated phase noise
at 1 MHz offset is 132.4 dBc/Hz at 5.0 GHz and a good FOM performance of
approximately 204.5 dBc/Hz is achieved.
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المؤتمر (5):
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عنوان المؤتمر:
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IEEE VTS APWCS 2014 :
The 11th IEEE Vehicular Technology Society Asia Pacific Wireless
Communications Symposium
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تاريخ الإنعقاد:
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28/08/2014
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مكان
الإنعقاد:
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Ping-Tung Hsien,
Taiwan.
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طبيعة المشاركة:
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Paper presentation
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عنوان المشاركة:
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A Novel Wide Tuning
Range LC-VCO with Small Phase Noise Variation
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ملخص المشاركة:
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A novel approach of
low phase noise variations varactor bank suitable for ultra wideband LC
voltage-controlled oscillators (LC-VCOs) with equally spaced, digitally
switched sub-band coarse tuning characteristics is proposed and characterized
in this paper to achieve a further reduced VCO tuning gain and phase noise.
The proposed VCO has been designed using UMC 130-nm CMOS technology and
features a phase noise variation of less than 3.9dBc/Hz. The VCO operates
from 2.71GHz to 5.98GHz, with a phase noise of -132.5dBc/Hz at 1 MHz offset,
a figure of merit (FoM) of -202.8dBc/Hz, less than -37dBm spurious harmonics
and a total VCO core current consumption of 880 μA from a 3.2 V supply
voltages.
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