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June 2007

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Subject:
From:
Donald Kyle <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Donald Kyle <[log in to unmask]>
Date:
Tue, 19 Jun 2007 07:36:22 -0500
Content-Type:
text/plain
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text/plain (78 lines)
Hello, Wee Mei

In the broadest sense GROUND refers to the return wire or object or 
path that is connected to a voltage source (clouds, batteries, power 
supplies, power lines).

With regard to electronic equipment, the different types of grounds 
are just names for different return paths to a power supply.

For example, if a circuit board had an analog section and a digital 
section the circuit designer may have two or three different power 
supplies for each section.

The digital power supplies most likely would have a common connection 
perhaps call DIGITAL GROUND and the analog sections would have a 
common connection called ANALOG GROUND.

Depending on the circuit design, these Grounds or return paths may be 
connected together at some point or not.

In the case of lighting or static electricity (ESD), objects like you 
and me or a door knob or your favorite electronic device can become 
the GROUND path to earth.  In these cases the ground path through the 
object would be considered an unwanted ground path.

Chassis ground can refer to the metal box that electronic circuits 
are housed in or the frame of your car.

If you are looking at AC power in your home for example, there are 
two types of ground.  One is called the safety ground (green wire) 
and the other is called the neutral or ground (white wire).  These 
two are connected together at the breaker box.  The safety ground is 
connected to the metal chassis of the electrical device to protect 
you from unwanted electrical currents.

I hope this helps.

Donald Kyle




At 03:25 AM 6/19/2007, you wrote:
>Hello,
>
>Can someone share with me the different types of grounds : ESD 
>ground, digital ground, analog ground, chassis ground, earth ground, 
>electrical ground, anymore other types of grounds . .  and their 
>functions and applications.
>
>Thanks in advance.
>Wee Mei
>
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