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- Original Message -
From: Terry Harris [EMAIL PROTECTED]
To: Protel EDA Forum [EMAIL PROTECTED]
Sent: Sunday, September 08, 2002 11:39 PM
Subject: Re: [PEDA] off topic supply SOS
On Sun, 08 Sep 2002 21:45:51 -0400, Brian Guralnick wrote
Brian,
Measuring spikes on the supply lines is not trivial. Where you put the
scope probe ground is everything. The best way to measure is with a
differential probe, placed across the power pins of the chip in question.
Anything less may not give you the true picture.
Don't misunderstand,
' [EMAIL PROTECTED]
Sent: Monday, September 09, 2002 2:24 PM
Subject: Re: [PEDA] off topic supply SOS
Brian,
Measuring spikes on the supply lines is not trivial. Where you put the
scope probe ground is everything. The best way to measure is with a
differential probe, placed across the power
On Mon, 09 Sep 2002 17:32:58 -0400, Brian Guralnick wrote:
Don't worry about the way I measure the spikes. I do use J-Fet buffered 1.5GHz
probes with the miniature GND spike pin which is
right next to the probe signal pin. On my PCB, I placed GND supply test points
around the PLD just for
On 02:24 PM 9/09/2002 -0400, Richard Sumner said:
Brian,
Measuring spikes on the supply lines is not trivial. Where you put the
scope probe ground is everything. The best way to measure is with a
differential probe, placed across the power pins of the chip in question.
Anything less may not
[EMAIL PROTECTED] on 10/09/2002 12:33:14 AM
Please respond to Protel EDA Forum [EMAIL PROTECTED]
To: Protel EDA Forum [EMAIL PROTECTED]
cc:(bcc: Clive Broome/sdc)
Subject: Re: [PEDA] off topic supply SOS
I traced a nasty set of spikes on the 1.8v supply with my storage scope
Message -
From: Ian Wilson [EMAIL PROTECTED]
To: Protel EDA Forum [EMAIL PROTECTED]
Sent: Monday, September 09, 2002 9:16 PM
Subject: Re: [PEDA] off topic supply SOS
On 02:24 PM 9/09/2002 -0400, Richard Sumner said:
Brian,
Measuring spikes on the supply lines is not trivial. Where you put
Having not placed enough power supply decoupling caps on a beta PCB, I'm looking for a
temporary overpriced decoupling solution
until the next beta boards are printed.
I'm looking for the lowest ESR possible caps. I found this company WIMA.
http://www.wima.de/smd2220.htm
1.0uf, 0.1uf,
]
Sent: Sunday, September 08, 2002 6:45 PM
Subject: [PEDA] off topic supply SOS
Having not placed enough power supply decoupling caps on a beta PCB, I'm
looking for a temporary overpriced decoupling solution
until the next beta boards are printed.
I'm looking for the lowest ESR possible caps
]
To: Protel EDA Forum [EMAIL PROTECTED]
Cc: JaMi Smith [EMAIL PROTECTED]
Sent: Sunday, September 08, 2002 10:10 PM
Subject: Re: [PEDA] off topic supply SOS
Brian,
What are you looking for?
Tantalems?
Ceramics?
What is the frequency you are having problems with?
Can you piggy back different
it's not exactly off topic, the board and the planes play a big role
what makes you say you have not placed enough?
Dennis Saputelli
Brian Guralnick wrote:
Having not placed enough power supply decoupling caps on a beta PCB, I'm looking for
a temporary overpriced decoupling solution
until
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