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Circuit Ground and Chassis Ground
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vikaskumar1983



Joined: 23 Nov 2007
Posts: 4
Post05 Nov 2009 16:49   

Circuit Ground and Chassis Ground
In most of the PCB boards which are the part of a chassis box where backplane exists, we creates two grounds. One is your circuit ground and another is chassis ground. These two grounds are separated by a parallel combination of a resistor [ 1Mohms] and a capacitor [1000PF,100V]. I want to know why to separate these two grounds in this way. And if we short these two grounds then what will happen ?

Please see the attached document also.


Thanks

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dick_freebird



Joined: 04 Mar 2008
Posts: 312
Helped: 45
Location: USA
Post05 Nov 2009 21:47   

Circuit Ground and Chassis Ground
A metal chassis is a huge antenna and you may pick up an
extra amount of electrical noise in your signal ground
if you tie them hard. The chassis only needs to be at a man-
safe potential and the rest of it you'd rather not "see".
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Post05 Nov 2009 21:47   

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snafflekid



Joined: 09 May 2007
Posts: 120
Helped: 16
Location: USA
Post06 Nov 2009 7:03   

Circuit Ground and Chassis Ground
I think this is to help minimize a ground loop. Whatever circuits in the chassis need to connect to another chassis through a wire, and there is a conductor that can connect the chassis. If there is a voltage difference between the two chassis, there will be a DC current flow through the signal wire and return back through the earth ground conductors. There does not need to be any resistor and capacitor joining the grounds, I think this prevents static buildup and dampen noise on the chassis
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