A New High Speed Carbon Nanotube Field Effect Transistor-Based Structure for 4-to-2 Compressor Cell

Abstract

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.

A New High-Performance Bridge Structure for 4- to-2 Compressor using CMOS and CNFET Technology

“…There are different designs of 4-to-2 compressor cells which have been proposed in various literature [10,12,[22][23][24][25]. In this section, several CMOS and CNFET-based 4-to-2 compressor cells are briefly reviewed.…”

“…In this design, one full adder and four NAND gates are used on two-input XNOR. The performance of this compressor cell depends on the full adder used in this cell [25]. …”

“…The critical path delay of this structure equals the sum of delays of one 2-way XOR, two 2-way XNOR, and two 2-way NAND gates. To design this cell, 78 transistors are required using CMOS implementation of basic blocks [25].…”

“…The critical path delay of this cell equals the sum of delays of three NOR and three NAND and one NOT gate. In this cell, the critical path at output nodes is very long which leads to long propagation delay [25]. This design has 74 transistors.…”

“…This design has 74 transistors. The CNFET design in [25] is shown in Fig.2f. In this design, in pull-down and pullup networks, transistors with normal threshold are used which are controlled by NOT gate with different threshold voltages.…”