By P. F. Hsieh, A. W. J. Stoddart

ISBN-10: 0387053697

ISBN-13: 9780387053691

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Additional resources for Analytic theory of differential equations; the proceedings of the conference at Western Michigan University, Kalamazoo, from 30 April to 2 May 1970

Example text

High-resolution conversion can be achieved by simply using a more accurate counter, which is relatively easy to implement. Another advantage of this process is that component value variations will have no effect on the accuracy. For instance, the capacitance may change due to temperature variation. But since the charging and discharging processes are done through the same capacitor, the net effect of this capacitance variation is negligible. The major disadvantage is that the charging and discharging of capacitors takes a relatively long time.

In practice, because the quantization process takes a finite amount of time, the sampled signal amplitude has to be held constant during this time. 13. The analog-todigital converter performs the quantization process. 13 Sample and hold circuit The hold capacitor holds the sampled measurement of the analog signal x(nT) for at most T seconds during which time a quantized value xQ(nT) is available at the output of the Converting analog to digital signals and vice versa 25 analog-to-digital converter, represented as a B-bit binary number.

37 shows such a current source multiplying DAC. The current sources are normally on and are grounded when not in use. 37 A current source multiplying DAC Converting analog to digital signals and vice versa 47 A voltage source can be used instead of current sources. The voltage source is applied to a series of scaled resistors. 38. The ‘on’ voltages are summed. The output is proportional to the weighted sum of the input voltages. Some devices have a built-in reference voltage source. Other ones allow the user to provide an external reference voltage, thereby setting the accuracy of the output.

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Analytic theory of differential equations; the proceedings of the conference at Western Michigan University, Kalamazoo, from 30 April to 2 May 1970 by P. F. Hsieh, A. W. J. Stoddart


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