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This paper proposes an automated design and optimization methodology for performance improvement of the MEMS unimorph piezoelectric harvesters based on Genetic Algorithm (GA), which can be conducted with minimum human efforts. In this regard, an analytic equation, which can predict harvested voltage in terms of geometric dimensions, is utilized as an objective function of GA. By using micro-fabrication...
A photonic-based phased array antenna (PAA) with ultra-fast beam scan is proposed and experimentally demonstrated using dispersion-based true time delay lines. The ultra-fast angle scan is realized using an ultra-fast wavelength-swept laser source which is constructed by a gated multi-wavelength laser (MWL) and a dispersion compensation fiber (DCF). The wavelength switching time is about several nanoseconds...
The conventional dummy fill insertion operation is usually conducted by foundries without taking into account circuit performance. In this paper, we propose a graph-based scheme to first modify layout interconnect geometry to improve pattern density uniformity in the analog layouts before the traditional dummy fill insertion process as an optional stage. The original analog constraints can be still...
In this paper, we propose a rule-based OPC (RB-OPC) algorithm considering process variation (PV) and integrate it into an analog layout retargeting platform. We apply interconnect wire operations during the retargeting process to compensate the accuracy limitation of the RB-OPC method. A PV-band shifting scheme is used to handle PV-induced-mismatch on circuit matching blocks. From our experimental...
In this paper, an efficient parasitic-aware geometric programming and many-objective evolution algorithm based two — phase hybrid sizing methodology is presented. It considers circuit performance constraints and layout parasitics simultaneously within a concurrent process by using convex optimization in the first phase, and knowledge-driven heuristic refinement in the second phase. The proposed method...
MEMS piezoelectric energy harvesters, due to their unique features in power density and ease of fabrication, are known as one of the most promising solutions for providing unlimited power sources for low-power electronic applications. In this paper, the analytic equations to estimate generated voltage amount by a piezoelectric cantilever under various vibrations are presented. The comparison between...
Due to the multi-mode characteristic of cigarette carton packaging machine, the traditional monitoring method such as data report and manual observation can not meet the need of high-efficient cigarette production. Based on operational mode recognition, a condition monitoring and diagnosis approach of ultrahigh-speed cigarette carton packaging machine was proposed. The stability factor within a sliding...
As an indispensable portion in the modern system-on-chip designs, analog circuits are becoming more intractable and error prone in the time-consuming design process due to the nature of high parasitic sensitivity along with the shrinking design window in the advanced technology. Compared to the digital counterpart, analog circuits need to be designed more carefully taking into account special analog...
In this paper a yield-aware template-based analog layout retargeting methodology for lithography-friendly nanometer technology designs is proposed. The yield performance is evaluated by probability of failure (POF), which is independent of any specific defect size, and is improved by wire-widening and wire-shifting inside the retargeting process. The non-traditional design rules, which are becoming...
Lithographic effects have long been a primary yield consideration during integrated circuit (IC) manufacture. Especially the random spot defects may easily lead to functional failures across the chip. In this paper, a lithography-friendly analog layout migration flow is proposed. The optimization is achieved by intelligent redundant space utilization, which includes wire widening and wire shifting...
The classical algorithms in DOA (Direction Of Arrival) estimation endure two obvious drawbacks that they are invalid when faced with the time-varying signals and difficult to be implemented in hardware. In this paper, we propose that Locally Competitive Algorithm (LCA) be applied to estimate the time-varying signals' DOA innovatively. In order to solve the l1-minimization problems rapidly and efficiently,...
Underwater/under-ice navigation systems are dependent on the precision of the embedded inertial measurement unit. The performance of MEMS-based gyroscopes, one of the most important inertial sensors, is heavily affected by fabrication imperfection and environmental variation. In this paper we propose and optimize a new mechanical structure for Z-axis tuning-fork gyroscopes along with atmospheric pressure...
This paper presents a design that forms the framework of an acoustic positioning system. The FPGA core system installed within any mobile target uses the passive architecture, which is selected to lengthen the lifetime of battery and to preserve location privacy. The mobile target can be tracked by detecting particular acoustic signals sent from moored transponders. The whole design is accomplished...
Parasitic capacitance of interconnects in the analog and mixed-signal VLSI circuits can be modeled by using physics equations or empirical curve fitting. In this paper, we propose an analytical model for computing parasitic capacitance between interconnects on different layers or on the same layer. In our method, electric flux is approximated to model different capacitive components, which combine...
Modification of mechanical structure of a MEMS gyroscope can significantly improve stability and sensitivity of the sensor. The parameters, which can affect sensitivity and stability of a vibratory inertial sensor, include signal coupling between the drive and sense parts, different damping sources such as air-damping and thermo-elastic damping, and fabrication tolerance. In this paper the mechanical...
Outlier detection is of much importance in preprocessing of data collected from complex industry system, for the data has strong nonlinearity and poor stability, involving much noise. Outlier detection based on clustering, rejects abnormal data points which have significant difference from others according to the definition of similarity. Self-organizing Feature Map (SOM) Neural Network algorithm...
In this paper a fast parasitic-aware synthesis approach of CMOS analog circuit is presented. Instead of the conventional approach of circuit sizing followed by layout generation, extraction and verification, we propose a method that considers the performance constraints and layout induced parasitics simultaneously within a concurrent phase of circuit synthesis. The proposed methodology is tested with...
In this paper, we discuss the acceleration effect for the FDTD method using SSE and AVX instructions. We developed three types of code: code developed by C language, code accelerated by SSE instructions and code accelerated by AVX instructions. We present the results of a performance study of the FDTD algorithm on Intel i5 Sandy Bridge. The results show that we can improve the performance of FDTD...
Electromagnetic researchers are often faced with long execution time and therefore algorithmic and implementation-level optimization can dramatically increase the overall performance of electromagnetism simulation using FDTD method. In this paper, we focus on acceleration implementation of 3D parallel FDTD method by taking advantage of the extended instruction sets found in modern processors, in particular...
The TiAl based alloy have fine lamina structures after solution treatment (1370°C, 120min, 50°C water quench). With the addition of W element, the O content is increased form base inside to outside, and the oxidation layer is upward 6um. The oxidation layer is reduced from 6um to 3um after Si element addition (0.5%at). The oxidation layers are alternated between TiO2 and Al2O3, and the outmost layer...
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