The PLL response to heavy ions radiation is investigated. Firstly, the radiation currents in transistors are introduced at the schematic level thanks to sources modeled in HDL-A. Secondly, the radiated block is simula...
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ISBN:
(纸本)0769508936
The PLL response to heavy ions radiation is investigated. Firstly, the radiation currents in transistors are introduced at the schematic level thanks to sources modeled in HDL-A. Secondly, the radiated block is simulated at the transistor level while the other blocks are replaced by a behavioral model in HDL-A. This allows to simulate the whole PLL in order to examine the effects of radiation at its output. The objective is to obtain a complete HDL-A behavioral model of PLL, including heavy ions effects.
This paper describes a table-based behavioralmodeling method and an efficient transient simulation method for oversampled MEMS systems. A system is represented by a set of coupled ordinary differential equations (ODE...
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ISBN:
(纸本)0769508936
This paper describes a table-based behavioralmodeling method and an efficient transient simulation method for oversampled MEMS systems. A system is represented by a set of coupled ordinary differential equations (ODEs) numerically described by table-based macromodels. Cubic spline interpolation is used to evaluate the model functions. The instant settling approximation and the explicit ODE solver are employed to enable efficient transient simulation. These methods are used to simulate a delta-sigma MEMS accelerometer and demonstrate high simulation efficiency.
This paper describes a novel modeling methodology for electrothermal effects in large mixed-signal circuits. It is accomplished by developing analog event-driven electrothermal and thermal models in an analog hardware...
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ISBN:
(纸本)0769508936
This paper describes a novel modeling methodology for electrothermal effects in large mixed-signal circuits. It is accomplished by developing analog event-driven electrothermal and thermal models in an analog hardware description language (AHDL). The large-scale mixed-signal circuits represented by the analog event-driven models can be analyzed more efficiently than using standard analog models.
A popular mechanism for transport of biological and non-biological fluidic samples in micro-scale geometries is the use of electrical fields. The use of electrical potentials to transport fluids is referred to as elec...
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ISBN:
(纸本)0769508936
A popular mechanism for transport of biological and non-biological fluidic samples in micro-scale geometries is the use of electrical fields. The use of electrical potentials to transport fluids is referred to as electroosmosis. In this paper, we present theories and results for electroosmotic transport in Bio-MEMS applications. In particular, we will describe approaches for efficient mixed-domain simulation of electroosmotic transport, and the extraction of reduced-order or low-order models for electroosmotic transport.
Sigma-Delta digital to analog converters are less vulnerable to circuit imperfections than their A/D counterparts because they have their noise-shaping loop all in the digital domain. Still the analog part of the syst...
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ISBN:
(纸本)0769508936
Sigma-Delta digital to analog converters are less vulnerable to circuit imperfections than their A/D counterparts because they have their noise-shaping loop all in the digital domain. Still the analog part of the system (basically a low-pass filter) can degrade the overall performance, especially in the case of multi-bit converters. This paper presents a way of identifying and simulating the major noise and harmonics contributions of the system using VHDL-AMS. The resulting system-level model can be used to explore different architectures in the digital domain and to determine the specifications of the different building blocks.
This article introduces the concept of combining both form (CAD models) and behavior (simulation models) of mechatronic system components into component objects. By composing these component objects, designers automat...
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ISBN:
(纸本)0769508936
This article introduces the concept of combining both form (CAD models) and behavior (simulation models) of mechatronic system components into component objects. By composing these component objects, designers automatically create a virtual prototype of the system they are designing. This virtual prototype, in turn, can provide immediate feedback about design decisions by evaluating whether the functional requirements are mel in simulation. To achieve the composition of behavioral models, we introduce a port-based modeling paradigm where systems consist of component objects and interactions between component objects. To maintain the consistency between the form and behavior of component objects, we introduce parametric relations between these two descriptions. In addition, we develop algorithms that determine the type and parameter values of the interaction models;these models depend on the form of both components that are interacting. The composable simulation environment has been implemented as a distributed system in Java and C++, enabling multiple users to collaborate on the design of a single system.
The VHDL-AMS(1) language supports the description of analog electronic circuits using Ordinary Differential Algebraic Equations(ODAEs), in addition to its support for describing discrete-event systems. For VHDL-AMS to...
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ISBN:
(纸本)0769508936
The VHDL-AMS(1) language supports the description of analog electronic circuits using Ordinary Differential Algebraic Equations(ODAEs), in addition to its support for describing discrete-event systems. For VHDL-AMS to be useful to the analog design community, efficient semiconductor device model must be available. This paper attempts to exploit the rich expressiveness of VHDL-AMS to describe semiconductor device models. The device models for diodes and transistors have been developed in VHDL-AMS and were validated using SEAMS(2), a mixed-signal simulator under development at the Distributed Processing Laboratory, University of Cincinnati.
The increasing importance of mixed-signal design among today's and tomorrows hardware systems brings up new challenges in the field of design tool construction We present a newly developed VHDL-AMS simulation fram...
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ISBN:
(纸本)0769508936
The increasing importance of mixed-signal design among today's and tomorrows hardware systems brings up new challenges in the field of design tool construction We present a newly developed VHDL-AMS simulation framework. It consists of a VHDL-AMS compiler, elaborator, and simulator comprising of a digital kernel and an analog kernel. The latter has an open interface for the integration of different analog solvers. A coupling with a MATLAB kernel is described in this paper. Furthermore, the framework provides an interface for the integration of different synchronization algorithms. The presented framework has an open object-oriented architecture which provides good capabilities for research in the field of mixed-signal simulation.
Verilog-AMS is one of the major mixed-signal hardware description languages on today's market In addition to the extended capabilities to model analog and digital behavior the language supports a novel approach to...
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ISBN:
(纸本)0769508936
Verilog-AMS is one of the major mixed-signal hardware description languages on today's market In addition to the extended capabilities to model analog and digital behavior the language supports a novel approach to merge existing digital and analog designs without rewriting the individual designs. At the center of this approach is the connect module and the connection rules. These language features enable the designer to declare modules which can be automatically or manually inserted at an intersection of net segments with different disciplines. A mapping between different disciplines and therefore between the different domains, enhances the (re)usability of designs and enables a natural approach to mixed-signal design. Circuitry of interest can be modeled,with high accuracy in the analog domain whereas less critical portions of the design are modeled in the faster but less accurate digital simulation domain. Since Verilog-AMS actively supports the mixed-signal approach, the interchange of digital and analog portions is straight forward and strongly, encouraged The purpose of this paper is to introduce the semantics of Verilog-AMS connect modules in greater derail and illustrate the impacts and trade-offs on the simulation performance. Closely related principles of driver-receiver segregation, discipline resolution and cross domain communication are discussed and evaluated to provide a thorough description of the extended Verilog-AMS mixed-signal simulation capabilities.
A behavioralmodeling procedure has been developed that enables the movement of poles and zeros to be modeled with changes in operating conditions. A major component of this procedure, known as the root localization a...
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ISBN:
(纸本)0780372913
A behavioralmodeling procedure has been developed that enables the movement of poles and zeros to be modeled with changes in operating conditions. A major component of this procedure, known as the root localization algorithm, identifies when such an approach is applicable, resulting in models that more accurately reflect the distinctive behavior of the circuit.
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