Efficient simulation of mixed signal designs requires the ability to quickly exchange analog and digital representations of a cell during the design and verification process. For the interconnection between analog net...
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ISBN:
(纸本)078037634X
Efficient simulation of mixed signal designs requires the ability to quickly exchange analog and digital representations of a cell during the design and verification process. For the interconnection between analog nets and digital signals, connect modules are used. Mostly these connections elements are limited to being uni-directional when inserted automatically. The paper describes how true bi-directional connect modules can be realized in VERILOG-AMS by using special language features.
An event-driven modeling and simulation technique, implemented in Matlab is presented in this paper. It enables rapid and accurate simulation as it only calculates the time instants of interest. This technique is succ...
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ISBN:
(纸本)0780397428
An event-driven modeling and simulation technique, implemented in Matlab is presented in this paper. It enables rapid and accurate simulation as it only calculates the time instants of interest. This technique is successfully applied to behavioralmodeling and simulation of an digital phase-locked loop. The simulation environment retains the flexibility of modeling and mathematical manipulation that characterizes Matlab. For example, it allows time-domain modeling phase noise of each component of a digital PLL.
作者：
Daniel, LWhite, JKMIT
Dept Elect Engn & Comp Sci Res Lab Elect Cambridge MA 02139 USA
In this paper we describe an approach to generating low-order models of spiral inductors that accurately capture the dependence on both frequency and geometry (width and spacing) parameters. The approach is based on a...
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ISBN:
(纸本)0780381351
In this paper we describe an approach to generating low-order models of spiral inductors that accurately capture the dependence on both frequency and geometry (width and spacing) parameters. The approach is based on adapting a multiparameter Krylov-subspace based moment matching method to reducing an integral equation for the three dimensional electromagnetic behavior of the spiral inductor. The approach is demonstrated on a typical on-chip rectangular inductor.
In simulation of a mixed-signal IC, a hypermodel must be inserted if a digital port and an analog port are connected. In order to obtain reliable circuit behavior, Terminal characteristics of the hypermodel should be ...
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ISBN:
(纸本)078037634X
In simulation of a mixed-signal IC, a hypermodel must be inserted if a digital port and an analog port are connected. In order to obtain reliable circuit behavior, Terminal characteristics of the hypermodel should be close enough to that of the digital circuit output. This article describes the methodology that a hypermodel library can be generated automatically based on the information of a cell library of designer's selection. A program is developed based on this methodology. Comparison of simulation results on characteristics of circuit level cell model and that of a selected hypermodel is also provided. The results show good fit and the generated hypermodel library can be used confidently in mixed-signal IC simulation.
Symbolic analysis [1] offers good opportunities for automated bottom-up generation of analytic models for nonlinear analog circuits. Unfortunately, the simulation performance for this kind of models is often a crucial...
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ISBN:
(纸本)0780397428
Symbolic analysis [1] offers good opportunities for automated bottom-up generation of analytic models for nonlinear analog circuits. Unfortunately, the simulation performance for this kind of models is often a crucial issue. This paper focuses on detailed performance analyses of the behavioralsimulation efficiency. Furthermore, promising approaches to improve the simulation performance by "simulator-friendly" formulation of the behavioral models and improvements of the simulation algorithms will be presented.
In this paper., a new laser diode model is presented including electrical, thermal and optical behaviors. This kind of model is feasible due to the high potential of VHDL-AMS in mixed-technology modeling. When simulat...
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ISBN:
(纸本)078037634X
In this paper., a new laser diode model is presented including electrical, thermal and optical behaviors. This kind of model is feasible due to the high potential of VHDL-AMS in mixed-technology modeling. When simulating, quantifies like currents voltage, dissipated thermal power, junction temperature, optic power and wavelength are calculated simultaneously. Interactions between these parameters are taking into account and equations are near physical laws. simulation results show static and dynamic characteristics and temperature effects.
Designers face the challenge of specifying and implementing complicated mixed-technology systems. In order to better address mixed-signal designs, the VHDL-AMS and Ferilog-AMS languages have been developed. These lang...
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ISBN:
(纸本)0780372913
Designers face the challenge of specifying and implementing complicated mixed-technology systems. In order to better address mixed-signal designs, the VHDL-AMS and Ferilog-AMS languages have been developed. These languages provide powerful capabilities to model and simulate behaviors in both the continuous and discrete time domains. Contemporaneously, the control systems community developed the object-oriented Modelica language to support the specification and continuous time modeling of complex control systems. The STEAMS (SUAVE and Tennessee Extensions for Analog and Mixed-Signal Systems) effort strives to provide an object-oriented systems specification and modeling language that supports both discrete and continuous time behaviors. STEAMS enables the modeling of interacting continuous and discrete time components coupled with the modeling productivity benefits associated with object-oriented techniques. This paper presents the requirements and rationale for the STEAMS language development effort, including modeling deficiencies currently facing the VHDL-AMS user community.
RadiSim is a fast, functional, and accurate RF (radio frequency) system simulator which estimates system performance, including bit error rate (BER), in minutes instead of hours or days. Since RadiSim simulates the en...
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ISBN:
(纸本)078037634X
RadiSim is a fast, functional, and accurate RF (radio frequency) system simulator which estimates system performance, including bit error rate (BER), in minutes instead of hours or days. Since RadiSim simulates the entire transmit-through-receive path quickly, we were able to search a large design space while creating our commercial radio chip. We describe the background and motivation;chip system model;fundamental design decisions;a novel way to estimate minimum E-b/N-o given maximum BER;optimal aggregation of BER estimates;our validation strategy and results;and some essential chip improvements enabled by RadiSim.
An iterative simulation environment for reliability problems due to long-term circuit degradation has been developed for use in SPICE-like simulators. A model developed for the NBTI (Negative Bias Temperature Instabil...
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ISBN:
(纸本)9781424415670
An iterative simulation environment for reliability problems due to long-term circuit degradation has been developed for use in SPICE-like simulators. A model developed for the NBTI (Negative Bias Temperature Instability) degradation effect in the standard Verilog-A language can be used with this reliability simulator. Integration in a design environment allows easy access to reliability simulation for the circuit designer.
A mixed-signal continuous time behavioral model of a continuous time delta-sigma modulator (CT DeltaSigma) is presented. CT DeltaSigma modulators, by their nature, are mixed-signal systems. That fact creates a discont...
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ISBN:
(纸本)0780381351
A mixed-signal continuous time behavioral model of a continuous time delta-sigma modulator (CT DeltaSigma) is presented. CT DeltaSigma modulators, by their nature, are mixed-signal systems. That fact creates a discontinuity in the traditional IC design flow which assumes that "discrete" and "continuous" time domain designs require separate design tools. In this work, we present a top level behavioral CT DeltaSigma model that can be used within the analog IC design environment. High speed CT DeltaSigma modulators are implemented using both "analog" and "digital" subblocks. We created mixed-signal models of the subblocks in order to efficiently perform simulations that accurately reflect circuit behavior in the continuous time domain. The models were built out of primitives available in SPICE and Verilog - A(TM). We present a first order CT low-pass DeltaSigma (CTLP DeltaSigma) as well as a fourth order CT band-pass DeltaSigma (CTBP DeltaSigma) to demonstrate the modeling technique and simulation methodology. We explored the influence of the loop delay and clock jitter on the CT DeltaSigma performance.
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