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Worst-case design is used in IoT devices and high performance data centers to ensure reliability, leading to a power efficiency loss. Recently, approximate computing has been proposed to trade off accuracy for efficiency. In this paper, we use Inexact Speculative Adders, which redesign the adder architecture to shorten its critical path and improve performance, but introduces controlled structural...
While sub/near-threshold design offers the minimal power and energy consumption, such approach strongly deteriorates circuit performances and robustness against PVT (process/voltage/temperature) variations, leading to gigantic speed penalties and large silicon areas. Inexact and approximate circuit design can address these issues by trading calculation accuracy for better silicon area, circuit speed...
Inexact and approximate circuit design is a promising approach to improve performance and energy efficiency in technology-scaled and low-power digital systems. Such strategy is suitable for error tolerant applications involving perceptive or statistical outputs. This paper reviews two established techniques applicable to arithmetic units: circuit pruning and carry speculation. A critical comparative...
Inexact or approximate circuits show great ability to reduce power consumption at the cost of occasional errors in comparison to their conventional counterparts. Even though the benefits of such circuits have been proven for many applications, they are not wide spread owing to the absence of a clear design methodology and the required CAD tools. In this regard, this paper presents a methodology to...
Inexact and approximate circuit design is a promising approach to improve performance and energy efficiency in technology-scaled and low-power digital systems. Such strategy is suitable for error-tolerant applications involving perceptive or statistical outputs. This paper presents a novel architecture of an Inexact Speculative Adder with optimized hardware efficiency and advanced compensation technique...
A 2.4 GHz polar transmitter compliant with the IEEE 802.15.6 standard is presented in this paper. A Linearized class-C power amplifier, employing dynamic biasing is used to minimize the adjacent channel interference and satisfy the defined spectrum mask requirements. An FBAR based frequency synthesizer enables fast startup and channel switching times. It is capable of addressing all the channels within...
We present inexact Fast Fourier Transform (FFT) accelerators that can realize energy-accuracy tradeoffs taking advantage of various inexact design techniques in conjunction with a machine-learning inspired waveform shaping technique. A 65nm ASIC test chip with several inexact FFTs shows a reduction in datapath energy consumption upto 75% and the total energy consumption upto 45% (a factor of 4X and...
We present a zero hardware-overhead design approach called reciprocative error compensation(REC) that significantly enhances the energy-accuracy trade-off gains in inexact signal processing datapaths by using a two-pronged approach: (a) deliberately redesigning the basic arithmetic blocks to effectively compensate for each other's (expected) error through inexact logic minimization, and (b) “reshaping”...
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