What is signal grounding

What is signal grounding

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On: 28 Jul, 2019

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A ground is a point or equipotential plane that serves as a reference for the voltages in a circuit or system. When grounding a circuit or system, we must minimize the noise voltages generated by currents flowing between circuits

through a...

A ground is a point or equipotential plane that serves as a reference for the voltages in a circuit or system. When grounding a circuit or system, we must minimize the noise voltages generated by currents flowing between circuits

through a common impedance. We must avoid ground loops because they are susceptible to magnetic interference and to voltage differences between different grounding points. Figure 3.47 shows three different grounding methods and the respective circuits to analyze them. With the series ground connection method, supply currents for each cir- cuit produce drops in voltage that result in a different voltage reference for each circuit, namely,

model to describe the problem of inductive coupling between circuit 1 and circuit 2

model to describe the problem of inductive coupling between circuit 1 and circuit 2

what is signal grounding 1

what is signal grounding 1

Because the output signals for each circuit are voltage-referenced to dif- ferent points, this interference source may be important. Therefore this grounding method should not be used whenever there are circuits with dis- similar supply currents. In any case the more susceptible stages should be placed close to the common reference point. The method of parallel grounding at a single point, shown in Figure 3.47b, requires a more involved physical layout but overcomes the problem pointed out for series grounding. Therefore it is the preferred method for low-fre- quency grounding.

For high-frequency circuits (>10 MHz) multiple grounding points as shown in Figure 3.47c are preferred to single-point grounding because a lower ground impedance is obtained. The impedance of the ground plane can be further reduced by plating its surface. different grounding methods and equivalent circuits

different grounding methods and equivalent circuits

 

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