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We proposed the balanced vertical double ‐ diffused MOS (B‐VDMOS) transistor. The B‐VDMOS transistor is not destroyed by avalanche breakdown and acquires the high second breakdown current. Owing to the high second breakdown current, the B‐VDMOS transistor has high electrostatic discharge (ESD) robustness. This paper presents the mechanism of the snapback phenomena and clarifies the cause that the B‐VDMOS transistor has the high second breakdown current. We find the cause that current does not become concentrated even after avalanche breakdown in the B‐VDMOS transistor. Copyright © 2009 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.

Abstruc&-60V Field NMOS and 60V Field PMOS have been developed on the standard 0.5 p m BiC-DMOS process without any additional process steps. Both of the devices handle 60V input voltage on every electrode, and have excellent current stability. Therefore, the devices have sufficient capability of 60V class level shifting and accurate voltage sensing. Especially, 6OV Field NMOS with negative threshold voltage has realized voltage sensing in the range &om zero to 60V, which is a novel function for HVIC.

We use the point-source method (PSM) to reconstruct a scattered field from its associated far field pattern. The reconstruction scheme is described and numerical results are presented for three-dimensional acoustic and electromagnetic scattering problems. We give new proofs of the algorithms, based on the Green and Stratton-Chu formulae, which are more general than with the former use of the reciprocity relation. This allows us to handle the case of limited aperture data and arbitrary incident fields. Both for 3D acoustics and electromagnetics, numerical reconstructions of the field for different settings and with noisy data are shown. For shape reconstruction in acoustics, we develop an appropriate strategy to identify areas with good reconstruction quality and combine different such regions into one joint function. Then, we show how shapes of unknown sound-soft scatterers are found as level curves of the total reconstructed field.