[SI-LIST] Re: Ferrite bead in ground path
- From: steve weir <weirsi@xxxxxxxxxx>
- To: si-list@xxxxxxxxxxxxx
- Date: Fri, 21 Dec 2012 10:08:33 -0800
Then it is almost certainly a vestige of the age of alchemists, leeches,
and humors. Do not copy that design.
Steve
On 12/21/2012 10:01 AM, Hithesh wrote:
> Gary,
> The ferrite is between the MCU analog ground(GNDA) and the circuit
> ground(not chassis ground). Majority of the components on the board are
> digital(MCU, SDRAM etc). There's also a ferrite in the power section.
> The MCU has 1.8V for analog circuitry (not ADC), probably PLL or some Vref
> circuitry. I did a quick datasheet search, didn't get any details.
>
> -Hithesh
>
>
> On Fri, Dec 21, 2012 at 11:16 PM, Gary Stein <garys@xxxxxxxxxxx> wrote:
>
>> Ground path between what? Beads between chassis ground and signal ground
>> are frequently used for emi/esd suppression, ie keep external high
>> frequency
>> transients out of signal ground and to keep any ground noise from radiating
>> from connectors shells and such. In such applications, chassis ground is
>> not a signal nor power return path.
>>
>> -----Original Message-----
>> From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
>> On
>> Behalf Of Ken Wyatt
>> Sent: Friday, December 21, 2012 11:43 AM
>> To: hitheshn@xxxxxxxxx
>> Cc: SI-List
>> Subject: [SI-LIST] Re: Ferrite bead in ground path
>>
>> I've seen ferrites in series with the green wire safety ground wire.
>> Otherwise, I wouldn't think you'd want an impedance in the signal OR power
>> return path, unless you'd want to keep us consultants employed!
>>
>> Cheers, Ken
>>
>> Kenneth Wyatt
>> Wyatt Technical Services LLC
>> Woodland Park, CO
>> ken@xxxxxxxxxxxxxxxx
>> www.emc-seminars.com
>> (Sent from my iPad)
>>
>> On Dec 21, 2012, at 10:14 AM, Hithesh <hitheshn@xxxxxxxxx> wrote:
>>
>>> I came across an old schematic that has ferrite bead in the ground
>>> path. Is there any advantage of using ferrite bead in the ground path.
>>> The general rule is to keep the ground path at low impedance.
>>> -Hithesh
>>>
>>>
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>
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