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Manuel Barros Author Vitae Jorge Guilherme Author Vitae Nuno Horta Author Vitae 《Integration, the VLSI Journal》2010,43(1):136-155
This paper presents a new design automation tool, based on a modified genetic algorithm kernel, in order to improve efficiency on the analog IC design cycle. The proposed approach combines a robust optimization with corner analysis, machine learning techniques and distributed processing capability able to deal with multi-objective and constrained optimization problems. The resulting optimization tool and the improvement in design productivity is demonstrated for the design of CMOS operational amplifiers. 相似文献
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The phenomenon of supergain for a circular array and its robust beamforming are presented. The coplanar superdirective array gain of the circular array, although it is not so extreme as an endfire line array, outperforms a lot over that of a conventional delay-and-sum beamformer in isotropic noise fields when the inter-element spacings are much smaller than one-half wavelength. However, optimum beamforming algorithms can be extremely sensitive to slight errors in array characteristics. The performance are known to degrade significantly if some of underlying assumptions on the sensor array is violated. Therefore, white noise gain constraint is used to improve the robustness of the supergain beamformer against random errors. We show that the design of the weight vector of robust supergain beamformer can be reformulated as a form of second-order cone programming and resolved efficiently via the well-established interior point method. Results of computer simulation for a 24-element circular array confirm satisfactory performance of the approach proposed in this paper. 相似文献
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Jonathan R. Haigh Author Vitae Lawrence T. Clark Author Vitae 《Integration, the VLSI Journal》2008,41(4):509-523
A fast low power four-way set-associative translation lookaside buffer (TLB) is proposed. The proposed TLB allows single clock phase accesses at clock frequencies above 1 GHz. Comparisons to a conventional fully associative CAM tagged TLB, which is the type most commonly used in embedded processors, with the same number of entries on a 65 nm low standby power process show that the proposed design has 28% lower delay and up to 50% lower energy delay product. Unlike previous set-associative TLBs, which replicate the TLB to support multiple page sizes, multiple page sizes are supported on a way-by-way basis. Alternative conventional CAM tagged and set-associative TLBs are investigated with regard to access latency, power dissipation and hit rates. 相似文献
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Jaime Ramírez-Angulo Author Vitae Author Vitae Antonio Lopez-Martin Author Vitae Author Vitae 《Integration, the VLSI Journal》2008,41(4):539-543
A simple dynamic biasing scheme to extend the input/output range of cascode amplifiers is introduced. It requires minimum extra hardware and no additional power consumption. A dynamic biased telescopic op-amp is discussed as an application example. Experimental results of a fabricated test chip in 0.5 μm CMOS technology are presented that verify the proposed technique. 相似文献
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Dahmani Mohammed Keche MokhtarAuthor VitaeOuamri AbdelazizAuthor Vitae Meche AbdelkrimAuthor Vitae 《AEUE-International Journal of Electronics and Communications》2010,64(12):1123-1127
In this paper we present an new approach based on two filters αβ and αβγ using Interacting Multiples Models (IMM) design instead of a Kalman filter second and third order for the tracking a single maneuver target. The comparison between the proposed filter and the IMM improves the computing time amount about 60% while having a high accuracy. 相似文献