Search

The new standard - VHDL-AMS (Very High Speed Hardware Description Language-Analogue Mixed Signals) was introduced several months ago. The main aim of introducing the new standard is unification of currently existing hardware description languages and (as in case of VHDL) making the libraries of elements that could be accessible by other users or designers. In this paper the presentation of the model of chemical sensor in VHDL-AMS was proposed. Presented description of the model as well as the results of the simulation was compared with the same model described in ELDO with usage of Hdl-A - so-called "quasi-standard" of the hardware description language introduced some years ago by Mentor Graphics.

In this paper it new tool for simulating 2D and 3D semiconductor structures is presented. New module SEMI in CFD-ACEU+ software allows to simulate such devices as diodes, various MOS transistors or even IGBT fabricated in silicon or GaAs technology. It also allows to create user's models with different doping, shape, and architecture to find out the most optimal structure for custom implementation. In this module also thermal problems, which occurs in such structures, can be analyzed.

In the designing process the most crucial parameter is time. During simulating MEFS (Micro Electro Fluidics Systems), the slowest part is the simulation of species concentration in capillaries, which is in 3D. Sometimes 3D structure can be replaced by 2D, but still simulation is relatively low. The solution for this problem is behavioral modeling of electrophoresis phenomenon in capillary in one of the languages such as HDLA or VHDL-AMS. In this paper a new approach in modeling electrophoresis phenomenon is presented. Implementing this phenomenon into HDLA shorten drastically the time of the simulation without decreasing of the model precision.

In this paper a new idea of integrated circuit designed for performing PCR (polymerase chain reaction) reaction is presented. This reaction consist in duplication of DNA chain. PCR has a significant place in molecular biology. Two elementary problems are described in this paper: accurate simulation of electroosmosis reactions and temperature distribution in the chip. All simulations have been made in CFD-ACE+MEMS software.

The purpose of this paper is the new approach of modeling and designs the sigma-delta converters in silicon microsystems. Microsystem described in this paper bases on two major parts. First part consists of various sensors and the second part consists of analogue to digital converters as well as other standard electronics circuits. The analogue to digital conversion is performed using sigma-delta modulators. Modulators were designed in CAD CADENCE environment and simulated using SPECTRES, and ELDO simulators. In this paper the simulation results were presented, and discussion of the advantages of sigma-delta conversion in this kind of measurement was underlined.

This paper presents an application of the new standard of VHDL language: VHDL-AMS in the field of magnetic microsensors modelling. In the following article three different magnetic field sensors have been demonstrated. Three models, described in two different languages: HDLA and VHDL-AMS, have been considered. ELDO-ANACAD and Spice models of above mentioned devices have been discussed and compared. In a conclusions comparison of the HDLA and VHDL-AMS languages have been presented.

In this paper potential merits of the new IEEE VHDL-AMS standard in the field of modeling of semiconductor devices are discussed. Special emphasis is given to the modeling of electro-thermal coupling. A simple example which allows for comparing the VHDL-like and the SPICE-like modeling techniques is provided.

In the 80's and 90's a rapid development in molecular biology occurred. But most of tests were done manually, what greatly enlarged total costs and total time of projects. That caused a very strong need for automation of testing process. In short time many companies released biosystems commonly known as "biochips", however a great number of them is still experimental ones. Despite the great interest in this area, there are only few professional software to design and simulate such complicated microsystems. In this paper a new powerful software dedicated for multidisciplinary simulations in 3D is presented. CFD-ACEU+ software can be used to simulate such phenomena like electroosmosis or electrophoresis, not only in simple capillaries, but also in complicated MEFS (Micro Electro Fluidics Systems), implemented into integrated circuits.

VHDL-AMS has been standardized in March 1999. Waited for a long time by every body, Industry as well as University, the language is beginning a career which we hope as successful as VHDL whose standard appears in 1987, followed by another one in 1993. We want to show in this paper that VHDL-AMS Is not only a language, but also a "philosophy", that could be very helpful for designing multi-technological systems and by combining both methods: Top-Down and Bottom-Up methods. For that, we start from the concept that VHDL-AMS modeling can be done according three categories of models: functional, behavioral and structural, and physical. Examples, some of them unexpected, will be given in each category. We then suggest a methodology for designing any multi-technological system by using these models and by making go and return (Yo-yo method) between Top-Down and Bottom-Up methods.