Dual-Quality 4:2 Compressors for Utilizing in Dynamic Accuracy Configurable Multipliers
ABSTARCT :
In this paper, we propose four 4:2 compressors, which have the flexibility of switching between the exact and approximate operating modes. In the approximate mode, these dual-quality compressors provide higher speeds and lower power consumptions at the cost of lower accuracy. Each of these compressors has its own level of accuracy in the approximate mode as well as different delays and power dissipations in the approximate and exact modes. Using these compressors in the structures of parallel multipliers provides configurable multipliers whose accuracies (as well as their powers and speeds) may change dynamically during the runtime. The efficiencies of these compressors in a 32-bit Dadda multiplier are evaluated in a 45-nm standard CMOS technology by comparing their parameters with those of the state-of-the-art approximate multipliers. The results of comparison indicate, on average, 46% and 68% lower delay and power consumption in the approximate mode. Also, the effectiveness of these compressors is assessed in some image processing applications.
EXISTING SYSTEM :
? The 4:2 and 5:2 compressors are commonly used in reducing the delay of the partial product in parallel multiplier summation stage.
? In this structure, the weights of all the inputs and the sum output are the same whereas the weights of the carry and Cout outputs are one binary bit position higher.
? The parameters of existing system were also taken as reference values in order to compare with the proposed design.
? The effectiveness of the proposed compressors in their exact operating mode utilized in the Dadda multiplier will be compared with that of the proposed approximate multiplier by in the same. mode.
DISADVANTAGE :
? The parallel multipliers are utilized as a part of superior applications where their expansive power utilizations may make problem area areas on the kick the bucket.
? Delay is high
? Power consumption is high
PROPOSED SYSTEM :
• In this paper, we have a tendency to propose four 4:2 compressors, which have the flexibility of change between the Exact and Approximate operative modes.
• In this paper, we propose compressors, which have the ability of switching between the approximate and exact modes with very small delay and power overheads.
• This operative mode, we propose disconnecting provide voltage of this gate by mistreatment the power gating.
• Some digital systems, like general purpose processors, are also utilized for each approximate and precise (Exact) computation modes.
ADVANTAGE :
? The parallel multipliers are used in high-performance applications where their large power consumptions may create hot-spot locations on the die.
? The performances of the approximate multipliers are assessed in some image processing applications.
? Specifically, achieving the desired performance (speed) considering the limited power budget of portable systems is challenging task.
? In addition, having a given level of reliability may be another obstacle in reaching the system target performance.
? The approach may be used for applications where there is not a unique answer and/or a set of answers near the accurate result can be considered acceptable.
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