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Hello Robert (and others),
During the reverse recovery/breakdown measurements with the 1N4448 array, there were some non-repetitive phenomena. I further investigated this with a current limited source with good RF decoupling (100nA) and 150 Ohms impedance.
Amazing results. Above about 20uA average reverse current, current spikes do occur due to instability. The measured rise/fall times are very likely less then 2.5ns (limited by my test setup). Peak current is 40mA (20uA average), with a lower longer lasting tail current. Even up to 8mA (that is 1W dissipation into a 1N4448), the instability remains, until it becomes stable due to self-heating. Peak current did not increase with increasing average current, but tail becomes longer and average PRF increases.
When only self-heating is taken into account, 1.3mA reverse current (200mW diode dissipation) becomes stable after a while due to self- heating. When externally heating the diode (I guess to about 80 degrees), all instability disappears (also at lower currents).
So without external heating, 1N4448 is not a good noise source.
Best regards and a successful 2010,
Wim PA3DJS
What do you recommend for a tornado?
-- Greed is the root of all eBay.
Windbreaker.
A bunker.
Cheers
Phil Hobbs
-- Dr Philip C D Hobbs Principal ElectroOptical Innovations 55 Orchard Rd Briarcliff Manor NY 10510 845-480-2058 email: hobbs at electrooptical dot net http://electrooptical.net
How do you wear a Bunker?
-- Greed is the root of all eBay.
Ask Edith.
Probably better than Gloria. Have you seen her lately?
-- Greed is the root of all eBay.
Good line. Just re-watching "All in the Family" AND "MASH" ;-) ...Jim Thompson
-- | James E.Thompson, CTO | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona 85048 Skype: Contacts Only | | | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at http://www.analog-innovations.com | 1962 | I love to cook with wine. Sometimes I even put it in the food.
BABE! ...Jim Thompson
-- | James E.Thompson, CTO | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona 85048 Skype: Contacts Only | | | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at http://www.analog-innovations.com | 1962 | I love to cook with wine. Sometimes I even put it in the food.
"Jim Thompson" wrote in message news: snipped-for-privacy@4ax.com...
The later years of MASH when Alan Alda began writing and directing are probably a skosh too liberal for your tastes? :-)
If a tornado is coming your way, you'll figure it out.
Cheers
Phil Hobbs
-- Dr Philip C D Hobbs Principal ElectroOptical Innovations 55 Orchard Rd Briarcliff Manor NY 10510 845-480-2058 email: hobbs at electrooptical dot net http://electrooptical.net
...ask "Archie"???
Not for a long time. :(
-- Greed is the root of all eBay.
No, that's what a tornado shelter is for. Underground.
-- Greed is the root of all eBay.
I didn't need that :-( I prefer to remember her from the TV series. ...Jim Thompson
-- | James E.Thompson, CTO | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona 85048 Skype: Contacts Only | | | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at http://www.analog-innovations.com | 1962 | I love to cook with wine. Sometimes I even put it in the food.
Funny. When MASH was first on TV I was too busy raising 4 children to watch much TV, and, in addition, didn't really like the show.
Now I find it both hilarious and sad.
BTW: There's a BIG difference between "liberal" and "leftist weenie".
Remember my political "score"... almost fully into the Libertarian corner. ...Jim Thompson
-- | James E.Thompson, CTO | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona 85048 Skype: Contacts Only | | | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at http://www.analog-innovations.com | 1962 | I love to cook with wine. Sometimes I even put it in the food.
Hi Jim,
"Jim Thompson" wrote in message news: snipped-for-privacy@4ax.com...
OK. Who (of well-known individuals) would you consider pretty liberal but not a leftist weenie? ;-)
---Joel
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