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Lab10 - LABORATORY 10 Thevenin Equivalent Circuits and...

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LABORATORY 10 Thevenin Equivalent Circuits and Nonideal Sources Lab Goals 1. Gain practical experience of working with simple resistive circuits 2. Construct and characterize a 4-bit D/A converter 3. Characterize non-ideal voltage sources at various frequencies 4. Measure the phase of AC signals
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Input impedance is the equivalent impedance with respect to the input terminals of a passive circuit. Passive circuit + _ V I Z = V I in A passive circuit has no sources.
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A simple example: find Z in Z in Z 1 Z 3 Z 2 Z 5 Z 4 Z in = Z 1 + Z 5 + (Z 3 +Z 4 ) Z 2 Z 2 +Z 3 +Z 4
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Resistive ladder circuit is easy to analyze Z in R o Fig. 10.10 Infinite R 0 - 2R 0 ladder R o R o R o 2 R o 2 R o 2 R o How well can we predict what really happens in the lab? Resistor values may vary from the nominal value Contact resistances may be important Measuring instruments need to be calibrated
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Why do we need D/A and A/D converters? A/D – converts electrical signals from sensors to digital form for signal processing D/A output from digital signal processors is used to control electro-mechanical actuators We want our digital electronic systems (computers) to interact with real world
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How does the 3-stage D/A converter work?
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