By D. E. Hyndman, N. Hiller

Analog and Hybrid Computing considers the basic features and principled of analog and hybrid desktops and their purposes in quite a few medical investigations. This ebook consists of 8 chapters, and starts with a short presentation of the historical past of computing units utilizing a generalized movement diagram of computation, illustrating the elemental transformations among analog and electronic pcs. the next chapters care for the speculation and the operation of the fundamental devices present in digital analog pcs, the tools of scaling difficulties for the pc, and the association and operation of laptop. those themes are by way of discussions at the recommendations of time-varying and non-linear differential equations and the simulation of move capabilities, that is an incredible element of analog computation. The concluding bankruptcy describes many of the extra in glossy desktops. those chapters relatively spotlight the gains and benefits of hybrid computing. This ebook is of worth to laptop engineers, scientists, and researchers, in addition to complicated laptop engineering scholars.

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Using this technique it is possible to generate an approximation to almost any required function, provided there are no discontinuities. Also, the maximum slope must not require voltage gradients between taps which will cause excessive current to flow in sections of the potentiometer. The accuracy with which a function can be generated depends on the number of taps on the potentiometer and the slope of the function curve. A disadvantage with tapped potentiometers is that the taps are normally equally spaced so that large errors can occur where the radius of curvature of the function is small.

42 ANALOG AND HYBRID COMPUTING The repetition rate in the circuit must be high compared with the highest signal frequency. In practice, repetition rates between 1 kHz and 300 kHz are used. The accuracy of this type of multiplier can be high, with a static accuracy of 0-01% possible and dynamic errors within 2% up to a frequency of ^ of the pulse repetition rate used. Analog-to-digital multiplier. This type of multiplier is not commonly available with analog computers, but it is a good example of the variable gain device technique, and with the advent of hybrid computing it could become important because of its mode of operation.

THEORY AND OPERATION OF THE BASIC UNITS 33 Let us now see how diode sections can be combined to generate an approximation to the curve of Fig. 10. The portion of the curve between x3 and x5 can be generated using a linear segment, that is one with no diode, where y = +kx. With just this segment we would of course get the linear relationship of Fig. 16 between y and x9 where the broken line is the actual curve we wish to generate. If we add some diode sections at the input of the amplifier, as shown in the circuit of Fig.

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