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Engineering and manufacturing industries

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The Analog Hybrid Computer - An Ideal Microcomputer Instrumentation and Controls Laboratory

Article Abstract:

Because real systems involve continuous variables, a microcomputer's discrete, digital data is not truly appropriate. However, add-on peripherals such as Comdyna's analog-hybrid unit can transform a microcomputer into a hybrid, linking and interfacing both digital and analog functions. Comdyna's Microhybrid 1 consists of an analog computer, digital computer, and interface unit. A hybrid computer can simulate natural systems, which are basically continuous, and also handle the discrete functions which are part of continuous systems, such as variable states and discrete events. Also, the use of hybrid circuitry can bring hardware, as well as software, solutions to design issues. In addition, a microhybrid is useful for research, product development, and teaching. Diagrams of microprocessor-based systems and the Microhybrid 1 system organization are presented.

Author: Spiess, R.H.
Publisher: Sage Publications, Inc.
Publication Name: SIMULATION
Subject: Engineering and manufacturing industries
ISSN: 0037-5497
Year: 1983
Computers, Digital computers, Real time systems, Interface, Microcomputer, Discrete Simulation, Real-Time System, Analog Systems, Hybrid Computers, Analog to Digital Converter, Asynchronous Processes, Hybrid Circuits, Microhybrid 1 (microcomputer)

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Modeling and simulation of an Analog Charge-Pump Phase Locked Loop

Article Abstract:

We describe a nonlinear computer simulation model of an Analog Charge-Pump Phase Locked Loop (ACP-PLL). Offsets of the Phase Detector and Analog Charge-Pump are modeled as disturbances to simulate their effects on the steady-state phase error of the loop. An extensive computer simulation study is carried out for the design of an example Analog CP-PLL using the proposed nonlinear model and comparing it to the conventional linear model. Results demonstrate the linear model is not sufficient to fully analyze and predict the behaviour of the Analog CP-PLL. (Reprinted by permission of the publisher.)

Author: Can, Sumer, Sahinkaya, Yilmaz E.
Publisher: Sage Publications, Inc.
Publication Name: SIMULATION
Subject: Engineering and manufacturing industries
ISSN: 0037-5497
Year: 1988
Computer aided design, Control systems, Telecommunications, Models, Computer-Aided Design

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The Comdyna GP-6 analog computer - twenty five years ... and still counting

Article Abstract:

The Comdyna GP-6 Analog Computer, now in its 25th year of production, continues to be one of the most used simulation computers on the market, despite competition from digital machines. One of the virtues of the GP-6 that ensures its continued success is that new units can operate side-by-side with GP-6s that are up to twenty years old, despite their physical differences. When compared to digital simulation computers, which are slow, analog processing breaks the bottlenecks of present and future information handling. A brief history of the Comdyna GP-6 Analog Computer is given.

Author: Spiess, Ray H.
Publisher: Sage Publications, Inc.
Publication Name: SIMULATION
Subject: Engineering and manufacturing industries
ISSN: 0037-5497
Year: 1992
Systems analysis, Computer history, Comparison, System Design, History of Computing

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Subjects list: Simulation, Continuous Simulation, Analog Computers, Digital Computers
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