🚀 go-pugleaf

John Larkin wrote:
> On Mon, 20 Jul 2009 11:00:40 -0700, "BobW"
> <nimby_GIMME_SOME_SPAM@roadrunner.com> wrote:
> 
>> "RFI-EMI-GUY" <Rhyolite@NETTALLY.COM> wrote in message 
>> news:4a64ac0d$0$5646$9a6e19ea@unlimited.newshosting.com...
>>> John Larkin wrote:
>>>> On Mon, 20 Jul 2009 08:02:20 +1000, "David L. Jones"
>>>> <altzone@gmail.com> wrote:
>>>>
>>>>> John Larkin wrote:
>>>>>> On Sun, 19 Jul 2009 22:04:25 +1000, "David L. Jones"
>>>>>> <altzone@gmail.com> wrote:
>>>>>>
>>>>>>> As promised, an expos� of an issue with the Rigol DS1052E
>>>>>>> oscilloscope in my latest video blog:
>>>>>>> http://www.alternatezone.com/eevblog/
>>>>>>>
>>>>>>> Dave.
>>>>>> Do the scopes work?
>>>>> Yep, they work. So Rigol are obviously getting away with it by hook or 
>>>>> by crook.
>>>>> If AD are deliberately under-speccing their normal chips, then it's a 
>>>>> clever ploy by Rigol to exploit it.
>>>>>
>>>>> Dave.
>>>> We overclock/overstress parts when there's a substantial payoff. One
>>>> Freescale uP is rated for 16 MHz clock, actually gets wonky at 44, so
>>>> we run it at 20. One microwave schottky diode is rated for 2 volts
>>>> reverse, leaks a bit at 7, so we use it at 4. Adding a heatsink to an
>>>> FPGA can buy some timing margin. Some diodes and cmos parts leak four
>>>> or five orders of magnitide less than the datasheet guarantees. An
>>>> 0603 resistor can dissipate a quarter of a watt safely. The trick is
>>>> to take calibrated risks where there's demonstrated margin and big
>>>> paybacks, and take zero risk everywhere else.
>>>>
>>>> John
>>>>
>>> Doesn't the manufacturer sort of put themselves at risk that the chip 
>>> vendor decides to change the process or ship marginal product ("Nobody is 
>>> buying our 100 MHz parts anymore, so we will save a few bucks and make and 
>>> ship 40 MHz parts (that pass only to 45 MHz)")?
>>>
>>> -- 
>>> Joe Leikhim K4SAT
>> Yep. That's what I would be extremely concerned about. If I ever decided to 
>> run a part over its rated limits (speed wise), I would put in hooks, for 
>> production testing, to lower its supplies to their minimum and then run 
>> those tests at the maximum rated d.u.t. temperature.
>>
>> Of course, in Larkin's case, the only person that can fire him for non 
>> performance and insubordination is his wife.
>>
> 
> Hey, nowadays I report to The Brat.
> 

I was just going to say, didn't she show an interest in the biz lately 
and even do a layout? Remember, she may one day be the one deciding 
which nursing home you guys go to ;-)

-- 
Regards, Joerg

http://www.analogconsultants.com/

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