Download زمان برگزاری:چهارشنبه 11-تیر-1393

:‫زمان نصب در تابلوی اعالنات‬
‫بسمه تعالی‬
‫دفاع از رساله دکتری‬

(Colloquium)
‫سمينار عمومي‬
‫دفاع از پایاننامه کارشناسیارشد‬
(Seminar)
‫سمينار تخصصي‬
(Informal Seminar) ‫سمينار تخصصي و مشورتي‬
Circuit Design with Multi-input Majority Function : ‫عنوان‬
for QCA and Nanotechnologies
‫ عصام الخالدی‬: ‫سخنران‬
After decades of the domination of the CMOS technology on the IC fabrication technologies new competitors :
‫چکيده‬
are now raising, since the CMOS start reaching the physical limit. Many emerging technologies are suggested to replace
CMOS. Great attention is paid to develop the nanotechnology fabrication techniques but few attempts were done to develop
special design techniques for the emerging nanotechnologies. In this thesis the multi-input majority function is presented as
a basic design tool for two of the nanotechnologies, QCA (Quantum Dot Cellular Automata) and CNFET (Carbon Nano
Tube Field Effect Transistor) with two different approaches.
For CNFET the proposed approach is based on using multi-input majority function as a threshold logic gate. The proposed
approach is used to illustrate a general form for the multi-inputs logic gates (AND, OR, NAND, and NOR). Also new
design approach for the multi-input XOR suitable for nanotechnologies is presented and deployed to CNFET 5-input & 7input XOR circuit. The results show good improvements in the speed and number of devices. The ( 4;2 ) compressor as a
multi-input multi-output circuit is employed as example circuit to demonstrate the new approach. Two versions of
transistor level design are presented for the proposed gate level design in the voltage and current modes. Simulation results
show good improvement in the number of gate levels and the number of transistors (in another word the circuit area). In
addition, in the current mode version of the ( 4;2 ) compressor a significant improvement in the speed of 84% is achieved.
The process variation study for the proposed 7-input XOR gate good results show the good match between the proposed
design approach and the CNFET technology.
For QCA the multi-input majority function is integrated into new 2-input and 3-input XOR designs to form a powerful
logic design tools for the ESOP (Exclusive OR Sum Of Products) algorithm. The proposed XOR designs are used to create
a single layer even parity generator with different word length up to 32-bits, full adder, and two forms of 5-2 compressor
using QCA. All the presented designs are simulated with QCADesigner and shown superior results as compared to
previously reported designs.
The PTM (Probabilistic Transfer Matrix) is used to inspect the reliability of multi-input majority function for QCA. This
study conclude that the single-gate with multi-input Majority has the same reliability of its 3-input form. To extend the
results to digital circuits, the full adder is used as a test bench. The results show the superiority of the full adder version
designed with 5-input majority gate upon other designs from reliability point of view.
1393-‫تير‬-11 ‫چهارشنبه‬:‫زمان برگزاری‬
117:‫مکان برگزاری‬