This paper presents a high speed design of 4-to-2 compressor, using Carbon Nanotube Field Effect Transistor (CNFET). CNFET is very suitable for low-voltage and high-frequency applications. Several conventional and state-of-the-art 4-to-2 compressor cells are also surveyed and compared in this paper. All designs are simulated by HSPICE with 32 nm CNFET technology. These designs have also been simulated at different supply voltage and different frequencies, load capacitors, and temperatures. The simulation results confirm that the proposed design is the fastest 4-to-2 compressor in different working circumstance.
In this paper, two novel low-power and high-speed carbon nanotube full-adder cells in dynamic logic style are presented. Carbon nanotube field-effect transistors (CNFETs) are efficient in designing a high performance circuit. To design our full-adder cells, CNFETs with three different threshold voltages (low threshold, normal threshold, and high threshold) are used. First design generates SUM and COUT through separate transistors, and second design is a multi-output dynamic full adder. Proposed full adders are simulated using HSPICE based on CNFET model with 0.9 V supply voltages. Simulation result shows that the proposed designs consume less power and have low power-delay product compared to other CNFET-based full-adder cells.
Purpose
This paper aims to present an inexact 4:2 compressor cell using carbon nanotube filed effect transistors (CNFETs).
Design/methodology/approach
To design this cell, the capacitive threshold logic (CTL) has been used.
Findings
To evaluate the proposed cell, comprehensive simulations are carried out at two levels of the circuit and image processing. At the circuit level, the HSPICE software has been used and the power consumption, delay, and power-delay product are calculated. Also, the power-delaytransistor count product (PDAP) is used to make a compromise between all metrics. On the other hand, the Monte Carlo analysis has been used to scrutinize the robustness of the proposed cell against the variations in the manufacturing process. The results of simulations at this level of abstraction indicate the superiority of the proposed cell to other circuits. At the application level, the MATLAB software is also used to evaluate the peak signal-to-noise ratio (PSNR) figure of merit. At this level, the two primary images are multiplied by a multiplier circuit consisting of 4:2 compressors. The results of this simulation also show the superiority of the proposed cell to others.
Originality/value
This cell significantly reduces the number of transistors and only consists of NOT gates.
Compressor and counter cells are the basic blocks used to accumulate the partial products in a multiplication process. In this paper, novel high speed and low power carbon nanotube counter cells are suggested. The efficiency of circuits is improved by using carbon nanotube field-effect transistors (CNFETs). The proposed designs are 4-to-3, 5-to-3, 6-to-3, and 7-to-3 counters. Using HSPICE, these proposed designs are simulated at different conditions. Simulation results confirm that the proposed designs are the fastest counters with lowest PDP in different working circumstance.
Abstract-In this paper, a new high-speed and energy efficient 4-to-2 compressor cell was presented using carbon nanotube field effect transistors (CNFETs). CNFET is very suitable for high-frequency and lowvoltage applications. In addition, in this paper several conventional and state-of-the-art 4-to-2 compressor cells are surveyed and compared. In order to evaluate the proposed designs, computer simulations are carried out using 32nm-CMOS and 32nm-CNFET technologies. Simulations are conducted using various low voltage power supplies, different temperatures, frequencies and load capacitors. Results of simulation demonstrate predominance of the proposed design in terms of power consumption, delay, and power-delay product (PDP) compared to other 4-to-2 compressor cells and they confirm that the proposed design is the fastest 4-to-2 compressor in various working circumstances.
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