Entries by Graham Bell

Yield Analysis and Performance Optimization Using FastBlaze and SPAYN

August 1, 2000in /by

In previous Simulation Standard articles (Nov 97 & Nov 98) FastBlaze has been presented as a new, highly efficient approach to simulating advanced HEMTs and MESFETs. Conventional device simulators often suffer from slow execution times, leading to a trade off between mesh density and physical model complexity against CPU run time and convergence. This requires engineers to compromise accuracy to achieve a reasonable throughput.

New Model for Simulation of Exposure Process in Complex Nonplanar Resist-Substrate Structures

August 1, 2000in /by

Predictive and efficient lithography simulation is an important component of the semiconductor industry efforts to develop the next generation of deep submicron technologies. Emerging technologies are based on elements with very small feature sizes and extremely complex and nonplanar topographies. Therefore lithography processing has to provide high resolution with large depth of focus. Simultaneously such effects as nonplanar reflections and notching as well as refractive index dependence on local absorbed dose are very critical for printing small mask elements using short wavelength radiation. This work presents a new approach for simulating the exposure process, which takes into account these effects in complex nonplanar resist-substrate structures.

Fast, Physical, Predictive and Calibrated Modeling of Ion Implantation

August 1, 2000in /by

In a Research & Development environment, Technology Computer Aided Design (TCAD) is involved in the device optimization loop and requires efficient and predictive implantation modeling with frequent updating of the range of validity. For this purpose, semi-empirical models using statistical distributions are mainly chosen, because this kind of simulation is faster than the physically based Monte-Carlo (MC) approach. We propose a methodology which can be applied to ion implantation modeling with easy build-up, and which gives a predictive capability in the explored experimental domain.

Modeling and Parameter Extraction Technique for HV MOS Devices with BSIM3v3

July 1, 2000in /by

In this paper, I have used the same technique to model uni-directional HV MOS devices as previously reported for bi-directional HV MOS devices [4] -[5] while adopting a new parameter extraction technique. With the new uni-directional HV MOS modeling technique, the simulated I-V characteristics of the uni-directional n-channel HV MOS device match the measured characteristics well, which confirms its effectiveness.

New RF MOSFET Small Signal SPICE Model – Part 2

July 1, 2000in /by

RF MOSFET Small – Signal Model and Parameters
Small-signal equivalent circuit of MOSFET after de-embedding parasitics is shown in Figure 1 and small-signal model parameters are listed in Table 1.
Parameter extraction is performed from real and imaginary parts of the Y-parameters. Each parameter is extracted from the Y-parameter equations which contain frequency terms.

UFSOI: Process-Based Compact SOI MOSFET Models

July 1, 2000in /by

SOI technology appears now to have become an advantageous, viable option for low-voltage and high-performance CMOS integrated circuits in digital, analog, and mixed-signal applications. The thin-film nature of the SOI MOSFET, however, can underlie physical mechanisms that complicate circuit simulation and portend equivocation in design. Consequently, Silvaco has incorporated the physical process-based UFSOI MOSFET models into SmartSpice and Utmost.