This paper explains the design and implementation of 8-bit ALU (arithmetic and logic unit) using VHDL by using mixed style of modeling in Xilinx ISE 8.1i. The ALU takes two8-bits numbers and performs different principal arithmetic and logic operations like addition, multiplication, logical AND, OR, XOR, XNOR, NOR. The major focus of concern in this ALU is the multiplication operation using radi...

In this review paper different design techniques of multi bit adder are deliberate using linear parameters logic gates. The comparison is carried by several parameter mainly focus on a number of linear threshold gates, a number of CMOS transistor, power dissipation, power delay product (PDP), average power dissipation time delay and size of the full adder circuit. Adder circuits basically imple...

Two new low-power, and high-performance 1bit Full Adder cells are proposed in this paper. These cells are based on low-power XOR/XNOR circuit and Majority-not gate. Majority-not gate, which produces Cout (Output Carry), is implemented with an efficient method, using input capacitors and a static CMOS inverter. This kind of implementation benefits from low power consumption, a high degree of reg...

The power-delay product is a direct measurement of the energy expanded per operational cycle of an arithmetic circuit. Lowering the supply voltage of the full adder cell to achieve low power-delay product is a sensible approach to improve the power efficiency at sustainable speed of arithmetic circuits composed of such instances at high level design. In this paper, a novel design of a low power...

Reconfigurable optical directed logic circuits (RODLC) aim to perform arbitrary operations using the switch network, in which electrical signals regarded as operands are applied control propagation of light over time, and operation results obtained at output ports network form light. In this paper, a novel RODLC is proposed experimentally demonstrated by utilizing an array with prosperous mode ...

In this paper, a word spotting approach for Farsi printed document images has been presented. The main idea of the paper is the font recognition of Farsi document images and query word modification according to the document image’s font before searching. This operation increases the similarity between the query word image and its instances in the document image; therefore, the performance of th...

In this paper, a new scheme is proposed to realize reconfigurable and multifunction optical logic gates (XOR, XNOR, NAND, OR) using Mach–Zehnder interferometer with tunable thermo-optic phase shifter (TOPS). The are realized by tuning the of an signal TOPS without changing physical device structure. logical input “0” or “1” considered corresponding at TOPS. output depends on light intensity por...

In recent literature, Reversible logic has become one of the promising arena in low power dissipating circuit design in the past few years and has found its applications in low power CMOS circuits , optical information processing and nanotechnology. The reversible circuits form the basic building block of quantum computers as all quantum operations are reversible. This paper presents asynchrono...

Approximate multipliers are widely being advocated for energy-efficient computing in applications that exhibit an inherent tolerance to inaccuracy. However, the inclusion of accuracy as a key design parameter, besides the performance, area and power, makes the identification of the most suitable approximate multiplier quite challenging. In this paper, we identify three major decision making fac...