Re: [PEDA] off topic supply SOS

2002-09-09 Thread Brian Guralnick
PROTECTED] Voice (514) 624-4003 Fax (514) 624-3631 - 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

Re: [PEDA] off topic supply SOS

2002-09-09 Thread Richard Sumner
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,

Re: [PEDA] off topic supply SOS

2002-09-09 Thread Brian Guralnick
' [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

Re: [PEDA] off topic supply SOS

2002-09-09 Thread Terry Harris
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

Re: [PEDA] off topic supply SOS

2002-09-09 Thread Ian Wilson
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

Re: [PEDA] off topic supply SOS

2002-09-09 Thread Clive . Broome
[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

Re: [PEDA] off topic supply SOS

2002-09-09 Thread Brian Guralnick
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

[PEDA] off topic supply SOS

2002-09-08 Thread Brian Guralnick
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,

Re: [PEDA] off topic supply SOS

2002-09-08 Thread JaMi Smith
] 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

Re: [PEDA] off topic supply SOS

2002-09-08 Thread Joe Sapienza
] 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

Re: [PEDA] off topic supply SOS

2002-09-08 Thread Dennis Saputelli
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