A 2-ps Resolution Wide Range BIST Circuit for Jitter Measurement
ABSTRACT In this paper, we propose a novel built-in self-test (BIST) circuit to directly measure cycle-to-cycle jitter. The clock-under-test is under-sampled by this measurement circuit and the jitter values are transformed into digital words. A time-amplified technique is applied to obtain relatively higher resolution with smaller hardware overhead. Experimental results show that our proposed circuit is able to measure the jitter providing the clock frequency up to 2 GHz with resolution of 2 picoseconds.
Conference Paper: Experimental Results of Built-In Jitter Measurement for Gigahertz Clock[Show abstract] [Hide abstract]
ABSTRACT: This paper demonstrates a built-in jitter measurement (BIJM) circuit for Gigahertz clock. Based on a jitter-amplified technique with a pulse-removing mechanism, the pico-second level resolution is achieved in wide frequency range. The experimental results show the feasibility of the proposed BIJM circuit.Asian Test Symposium, 2008. ATS '08. 17th; 12/2008
[Show abstract] [Hide abstract]
ABSTRACT: New ideas are presented in this paper for the boundary recovery of 3D Delaunay triangulation. Fully constrained Delaunay triangulations in terms of geometrical and topological integrities on all boundary edges and facets are required in many applications, such as meshing by components, fluid–structure interactions, parallel mesh generation, local remeshing and interface problems. The geometry of boundary edges and facets can be recovered by the introduction of Steiner points. However, for a fully constrained Delaunay triangulation, these Steiner points have to be removed or repositioned towards the interior of the domain to restore the topological integrity of the boundary edges and the facets. It is found that Steiner points on edges could be removed more systematically following a specific sequence in an alternative manner rather than a random selection commonly adopted in practice; whereas for Steiner points on a facet, a weight on the Steiner point adjacency would lead to an optimal order to facilitate their removal. A linear programming technique is also employed to determine the feasible region for the relocation of Steiner points in the interior of the domain. Work examples and industrial applications with details in the boundary recovery are presented to illustrate how the algorithm works on objects with difficult boundary conditions.Finite Elements in Analysis and Design 07/2014; 84:32–43. DOI:10.1016/j.finel.2014.02.006 · 1.60 Impact Factor
[Show abstract] [Hide abstract]
ABSTRACT: Computer animation requirements differ from those of traditional computational fluid dynamics CFD investigations in that visual plausibility and rapid frame update rates trump physical accuracy. We present an overview of the main techniques for fluid simulation in computer animation, starting with Eulerian grid approaches, the Lattice Boltzmann method, Fourier transform techniques and Lagrangian particle introduction. Adaptive grid methods, precomputation of results for model reduction, parallelisation and computation on graphical processing units GPUs are reviewed in the context of accelerating simulation computations for animation. A survey of current specific approaches for the application of these techniques to the simulation of smoke, fire, water, bubbles, mixing, phase change and solid–fluid coupling is also included. Adding plausibility to results through particle introduction, turbulence detail and concentration on regions of interest by level set techniques has elevated the degree of accuracy and realism of recent animations. Basic approaches are described here. Techniques to control the simulation to produce a desired visual effect are also discussed. Finally, some references to rendering techniques and haptic applications are mentioned to provide the reader with a complete picture of the challenges of simulating fluids in computer animation.International Journal of Computational Fluid Dynamics 07/2012; 26(6-8):407-434. DOI:10.1080/10618562.2012.721541 · 0.72 Impact Factor