Abstract — With mixed-signal designs becoming more complex and time-to-market windows shrinking, designers cannot hope to keep up unless they change the way they design. They must adopt a more formal process for design and verification: topdown design. It involves more than simply a cursory design of the circuit block diagram before designing the blocks. Rather, it also involves developing and ...

Version 1a, October 2001 With mixed-signal designs becoming more complex and time-to-market windows shrinking, designers cannot hope to keep up unless they change the way they design. They must adopt a more formal process for design and verification: top-down design. It involves more than simply a cursory design of the circuit block diagram before designing the blocks. Rather, it requires devel...

Simulation of hybrid systems is considerably more complex than pure continuous-time systems due to blocking states, exceptions due to discrete events, and Zeno-type behavior. Rather than esoteric, hybrid systems are actually the norm for industrial process simulation when including the possibility of tanks running dry, vessels overflowing etc. This paper compares two modelling tools; (one block...

There has been a proliferation of block-diagram environments for specifying and prototyping DSP systems. These include tools from academia like Ptolemy [6], and commercial tools like SPW from Cadence Design Systems, and Cossap from Synopsys. The block diagram languages used in these environments are usually based on dataflow semantics because various subsets of dataflow have proven to be good m...

It is natural to question how continuous-time signals and systems concepts are relevant to digital signal processing. To answer this question, it is helpful to first consider elementary signals and systems structures. In the most simplistic sense, the study of signals and systems is described by the block diagram shown in Fig. 1.1a. An input signal is fed into a system to produce an output sign...

This article presents new current-mode oscillator circuits using CDTAs which is designed from block diagram. The proposed circuits consist of two CDTAs and two grounded capacitors. The condition of oscillation and the frequency of oscillation can be adjusted by electronic method. The circuits have high output impedance and use only grounded capacitors without any external resistor which is very...

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A unified description of networked dynamical systems, entitled multiport diagram, is proposed in this paper. The multiport diagram is an object-oriented model structure described into a general mathematical framework, independently from any computer language. It is shown that usual diagrammatic representations of networks, e.g. block diagrams, signal flow graphs, compartmental networks and bond...

Object-oriented features such as encapsulation, inheritance, and state dependent behavior raise new problems in software testing. In this paper, we describe a reverse engineering approach for software testing of object-oriented programs. The approach is based on a graphic model which consists of three types of diagrams: object relation diagram, block branch diagram, and object state diagram. An...

The Ordered Binary Decision Diagram (OBDD) has been efficiently used to compute the communication network (CN) reliability (REL). The boundary set method (BS) is used to improve the efficiency of the OBDD approach, while the augmented OBDD diagrams (OBDD-A) that stores CN information in its nodes has been proposed to solve other CN performance metrics in addition to REL. The hybrid OBDD (OBDD-H...