Related Experiment Video
Updated: Jan 23, 2026
07:45
Quasi-light Storage for Optical Data Packets
Published on: February 6, 2014
11.3K
Speed and energy optimized quasi-delay-insensitive block carry lookahead adder
P Balasubramanian1, D L Maskell1, N E Mastorakis2
1School of Computer Science and Engineering, Nanyang Technological University, Singapore.
Plos One
|June 22, 2019
Summary
A new asynchronous quasi-delay-insensitive (QDI) block carry lookahead adder with redundant carry (BCLARC) offers improved speed and energy efficiency. This novel design outperforms existing asynchronous adders across various architectures, demonstrating significant reductions in cycle time and power-cycle time product.
Area of Science:
- Computer Engineering
- VLSI Design
- Digital Circuits
Background:
- Asynchronous circuits offer potential advantages in speed and power efficiency over synchronous designs.
- Existing asynchronous adders, including QDI and relative-timed variants, present trade-offs in performance and energy consumption.
- Block Carry Lookahead Adders (BCLARC) are known for their efficiency in arithmetic operations.
Purpose of the Study:
- To introduce a novel asynchronous quasi-delay-insensitive (QDI) Block Carry Lookahead Adder with Redundant Carry (BCLARC).
- To evaluate the performance and energy efficiency of the proposed QDI BCLARC against existing asynchronous adder architectures.
- To demonstrate the advantages of the new design in terms of cycle time (CT) and power-cycle time product (PCTP).
Main Methods:
- Implementation of a new asynchronous QDI BCLARC using delay-insensitive dual-rail data encoding.
- Utilization of 4-phase return-to-zero (RTZ) and 4-phase return-to-one (RTO) handshaking protocols.
- Performance and energy efficiency comparison with various asynchronous adders (RCA, CCLA, CSLA, BCLARC, hybrid BCLARC-RCA) using 32/28nm CMOS technology.
Main Results:
- The proposed QDI BCLARC demonstrates significant reductions in Cycle Time (CT) and Power-Cycle Time Product (PCTP) compared to existing asynchronous adders.
- Achieved average reductions of 20.5% in CT and 19.6% in PCTP versus QDI early output RCA.
- Showcased substantial improvements over CCLA (47.5% CT, 47.2% PCTP) and CSLA (32.9% CT, 35.9% PCTP).
Conclusions:
- The developed asynchronous QDI BCLARC offers superior speed and energy efficiency compared to current asynchronous adder designs.
- The novel architecture effectively reduces both data processing time and power consumption, leading to enhanced overall performance.
- This design represents a significant advancement in high-performance, low-power asynchronous adder technology for VLSI applications.
Related Concept Videos
01:22Energy Carried By Electromagnetic Waves
3.8K
Anyone who has used a microwave oven knows there is energy in electromagnetic waves. Sometimes, this energy is obvious, such as in the summer sun's warmth. At other times, it is subtle, such as the unfelt energy of gamma rays, which can destroy living cells. Electromagnetic waves bring energy into a system through their electric and magnetic fields. These fields can exert forces and move charges in the system and, thus, do work on them. However, there is energy in an electromagnetic wave,...
3.8K
01:35Light as Energy
95.6K
The energy required to carry out photosynthesis is light— typically electromagnetic radiation from the sun. The range of all possible wavelengths is known as the electromagnetic spectrum.
Photons
A photon is a discrete electromagnetic particle or bundle of energy. Photons are characterized by their frequency, wavelength, and amplitude, similar to the properties of a wave. Waves with higher frequencies transmit more energy and have shorter wavelengths than longer wavelengths that transmit...
Photons
A photon is a discrete electromagnetic particle or bundle of energy. Photons are characterized by their frequency, wavelength, and amplitude, similar to the properties of a wave. Waves with higher frequencies transmit more energy and have shorter wavelengths than longer wavelengths that transmit...
95.6K
00:48Optimal Foraging
13.7K
How animals obtain and eat their food is called foraging behavior. Foraging can include searching for plants and hunting for prey and depends on the species and environment.
13.7K
01:26Activation Energy
86.4K
Activation energy is the minimum amount of energy necessary for a chemical reaction to move forward. The higher the activation energy, the slower the rate of the reaction. However, adding heat to the reaction will increase the rate, since it causes molecules to move faster and increase the likelihood that molecules will collide. The collision and breaking of bonds represents the uphill phase of a reaction and generates the transition state. The transition state is an unstable high-energy state...
86.4K
01:15Insensitive Nuclei Enhanced by Polarization Transfer (INEPT)
1.0K
Insensitive Nuclei Enhanced by Polarization Transfer (INEPT) is an advanced Nuclear Magnetic Resonance (NMR) technique specifically designed to detect and enhance the signals of low-abundance nuclei, such as carbon-13 and nitrogen-15, in small molecules. The fundamental principle behind INEPT is the transfer of polarization from a more abundant and highly polarizable nucleus, typically hydrogen-1, to the low-abundance nucleus of interest. This process effectively boosts the NMR signal of the...
1.0K
03:12Ionization Energy
43.0K
The amount of energy required to remove the most loosely bound electron from a gaseous atom in its ground state is called its first ionization energy (IE1). The first ionization energy for an element, X, is the energy required to form a cation with 1+ charge:
43.0K