[SI-LIST] Re: Power ground and signal ground
- From: steve weir <weirsi@xxxxxxxxxx>
- To: si-list@xxxxxxxxxxxxx
- Date: Wed, 15 Feb 2012 12:55:57 -0800
1. Remove the word ground from your vocabulary. There are schematic
nodes that serve as commons for one purpose or another at DC and low
frequency.
2. There is:
SPICE node 0, a virtual reference point used for voltage potential
calculations.
VSS or power common. This could be traces or a plane, but at RF the
absolute potential at any two points will not be the same. Bypass
capacitors keep the voltage potential between VDD and VSS as fed to any
given part within tolerable limits.
Signal common. This is most often the same as VSS, but for things like
ECL it can be VDD / VCC. This is the voltage reference against which a
transmitted signal swings.
3. That depends on what circulating currents will result. The important
things to remember are:
a. What are the safety requirements?
b. What are the circulating current paths at low and high frequency that
you care about.
On 2/14/2012 10:18 PM, Balamanikandan K wrote:
> Hi,
> I would like to understand the following. Please clarify.
>
> 1. Concept of Power ground and Signal ground.
>
> 2. what is the difference between Power Ground and signal ground in DC DC
> converters?
>
> 3. What will happen if we connect them together?
>
--
Steve Weir
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