Tadatoshi Sekine

Block-Latency Insertion Method (Block-LIM) for Fast Transient Simulation of Tightly Coupled Transmission Lines

This paper describes a block-latency insertion method (LIM) for the fast transient simulation of the large networks with many coupling elements. First, the basic formulation of LIM is reviewed. Next, the block-LIM formulation for the network with many coupling elements, such as the mutual inductance, the mutual capacitance, and controlled sources is described. Then, the block-LIM algorithm is applied to the tightly coupled transmission lines, which are connected to each other by a number of mutual inductors and capacitors. Finally, some numerical results are shown, and it is confirmed that the proposed technique is useful and efficient for the simulation of the tightly coupled transmission lines.

Locally Implicit LIM for the Simulation of PDN Modeled by Triangular Meshes

This letter describes a locally implicit latency insertion method (LILIM) for the fast simulation of an arbitrary shaped power distribution network (PDN) modeled by triangular meshes. First, an efficient modeling method based on triangular mesh is reviewed and we refer to the limitation of the LIM for the meshed PDN analysis. Next, in order to overcome the problem, we formulate the LILIM by combining the efficient modeling and the locally implicit schemes. Finally, the numerical results show that the LILIM is applicable and efficient for the simulation of the PDN analysis.

Block latency insertion method (Block-LIM) for fast transient simulation of tightly coupled transmission lines

This paper describes a block-latency insertion method (LIM) for the fast transient simulation of the large networks with many coupling elements. First, the basic formulation of LIM is reviewed. Next, the block-LIM formulation for the network with many coupling elements, such as the mutual inductance, the mutual capacitance, and controlled sources is described. Then, the block-LIM algorithm is applied to the tightly coupled transmission lines, which are connected to each other by a number of mutual inductors and capacitors. Finally, some numerical results are shown, and it is confirmed that the proposed technique is useful and efficient for the simulation of the tightly coupled transmission lines.

CMOS circuit simulation using Latency Insertion Method

This paper describes the application techniques of latency insertion method to a CMOS circuit simulation. First, the existing and modified application techniques for a CMOS inverter circuit are shown. Then, this method is improved in order to apply to general CMOS circuits. Finally, it is confirmed that our method is useful.

Fast Circuit Simulation Based on Parallel-Distributed LIM using Cloud Computing System

This paper describes a fast circuit simulation technique using the latency insertion method (LIM) with a parallel and distributed leapfrog algorithm. The numerical simulation results on the PC cluster system that uses the cloud computing system are shown. As a result, it is confirmed that our method is very useful and practical.

Alternating Direction Explicit-Latency Insertion Method (ADE-LIM) for the Fast Transient Simulation of Transmission Lines

This paper describes the alternating direction explicit-latency insertion method (ADE-LIM) for the fast simulations of transmission lines. LIM is one of the fast transient analysis techniques for large networks. However, because this method is based on an explicit finite-difference method, it has a limitation of the time step size for the numerical stability condition similar to the finite-difference time-domain technique. On the other hand, the ADE method is one of the finite-difference methods and has advantages of less computational complexity and numerical stability. In this paper, we propose ADE-LIM as an improved method of LIM. This method can circumvent the above time step limitation problem because the method is based on the ADE algorithm. Numerical results show that ADE-LIM is about 3-3.5 times faster than LIM in the transmission line analyses with appropriate accuracy.

Parallel-Distributed Block-LIM for Transient Simulation of Tightly Coupled Transmission Lines

In this paper, the parallel-distributed block-latency insertion method (block-LIM) is proposed for the fast transient analysis of a large-scale circuit that includes lots of coupling elements, such as mutual inductance and mutual capacitance. A conventional SPICE-like simulator requires an enormous cost for transient analysis of large-scale equivalent network that includes tightly coupled transmission lines, which is derived by using well-established commercially based extractors. The proposed method is based on the leapfrog algorithm, and can efficiently analyze tightly coupled transmission lines. First, the original LIM and the block-LIM are reviewed briefly. Next, the parallel-distributed block-LIM is proposed for the fast transient simulation and is implemented on the personal-computer-cluster system. Finally, some numerical results are shown, and it is confirmed that the proposed technique is useful and efficient for the simulations of the tightly coupled transmission lines.

A Hybrid Implicit–Explicit and Conformal (HIE/C) FDTD Method for Efficient Electromagnetic Simulation of Nonorthogonally Aligned Thin Structures

In a conventional finite-difference time-domain (FDTD) method, the computational cost increases as a grid spacing decreases because the number of unknowns increases and a time step size decreases to fulfill a numerical stability condition. Especially, it is inherently time-consuming to analyze thin structures such as a printed circuit board (PCB) and nonorthogonally aligned objects such as interconnection patterns on the PCB. In this paper, we propose an efficient electromagnetic simulation technique which is constructed by combining a hybrid implicit-explicit (HIE)-FDTD method and a conformal FDTD (CFDTD) method. The proposed technique can avoid the aforementioned problems by exploiting advantages of the HIE-FDTD and CFDTD methods. An example model of the interconnection pattern on the PCB is analyzed by the proposed and conventional methods, and we compare their accuracy and efficiency.

Fast Transient Analysis of Nonuniform Multiconductor Transmission Lines Using HIE-Block-LIM

This letter describes a hybrid implicit-explicit block latency insertion method (HIE-block-LIM) for the fast simulation of nonuniform multiconductor transmission lines (MTLs). In the HIE-block-LIM, an implicit difference method is used with respect to the current variables in the y-direction, and an explicit method is adopted to update the other variables. The HIE-block-LIM can alleviate a time step size limitation of the existing block-LIM by taking both advantages of the explicit and implicit difference methods. Numerical results show that the HIE-block-LIM is suitable for the fast simulation of the nonuniform MTLs.

Unified circuit modeling technique for the simulation of electrostatic discharge (ESD) injected by an ESD generator

In this paper, we describe the modeling and simulation techniques of electrostatic discharge (ESD) events. First, the existing circuit models of the ESD generator are reviewed, and the improved model is proposed. Next, the target printed circuit board circuit is modeled, and a ground plane of the board is excited by the proposed ESD generator model. Finally, simulation of the whole circuit is performed using our models, and it is shown that our methodology is far superior to the conventional techniques.