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SS phase splitters?
SS phase splitters?
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Old 22nd July 2013, 12:08 AM   #71
wrenchone is offline wrenchone  United States
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I don't like those clip-on heat sinks - I find them flimsy and unreliable. I just glue a piece of aluminum to the package with Arctic Silver epoxy. I suspect that even JB Weld would work as adhesive for a high thermal resistance application like this, as it's metal filled.
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Old 22nd July 2013, 12:31 AM   #72
Eli Duttman is offline Eli Duttman  United States
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Originally Posted by wrenchone View Post
I don't like those clip-on heat sinks - I find them flimsy and unreliable. I just glue a piece of aluminum to the package with Arctic Silver epoxy. I suspect that even JB Weld would work as adhesive for a high thermal resistance application like this, as it's metal filled.
Do you bother to blacken the aluminum pieces that you use?
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Old 22nd July 2013, 01:49 AM   #73
kenpeter is offline kenpeter  United States
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http://www.onsemi.com/pub_link/Colla...MJE15034-D.PDF
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Old 22nd July 2013, 02:19 AM   #74
wrenchone is offline wrenchone  United States
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I don't generally blacken the aluminum, not really an issue for dumping an extra few hundreds of milliwatts.
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Old 22nd July 2013, 04:15 AM   #75
kenpeter is offline kenpeter  United States
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We really need a fully differential phase splitter that can drive DC into grids.
Impedances both so ridiculously low it won't matter if they equal or not...

Something like the concept shown in #41, but with more details worked out.
Fully differential op-amps are certainly available, but thats sorta cheating....
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Old 22nd July 2013, 07:41 AM   #76
tinitus is offline tinitus  Europe
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SS phase splitters?
Quote:
Originally Posted by kenpeter View Post
What drawing? #13...
good one, thanks

Quote:
Originally Posted by kenpeter View Post
As for #68.....
I was sleepy and on my way to bed so I have to repost it
maybe Im clueless already, but what you guys consider optimal in the end, will probably be out of my reach anyway
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Old 22nd July 2013, 12:31 PM   #77
kenpeter is offline kenpeter  United States
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I'm just sayin' if you not gonna leverage any advantage offered by P,
you would be better served with N, superior in every other respect.
Plain old concertina will work fine with either type...

No, wait... You are using a unique feature of P, I just didn't see it...

If plate is comfortably above B/2, then you can direct couple just
as you've drawn. With N would have to do something more to drop
the coupling voltage below B/2. Maybe this advantage makes P
worth its weight even in this most simplified circuit?

-----

So, thats 3 advantages for P.

1) Direct coupling at 3/4 B+
2) Free CCS by strapping plate resistor across VBE or VGS
3) Equal impedance split, if we feed Drain/Mu back to Cathode

Advantages for N.

1) Works in traditional circuit without modifications
2) Better gm and less capacitance than P
3) Cheap and plentiful

Last edited by kenpeter; 22nd July 2013 at 12:55 PM.
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Old 22nd July 2013, 01:14 PM   #78
tinitus is offline tinitus  Europe
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SS phase splitters?
ehh...what did I accidentally turn the ZVN0545 mosfet upside down ?

btw, I tried to find a mosfet equal to the suggested ZVN0545, on capacitance parameters
but seems impossible to beat
output and reverse capacitance might be matched by a few others, but input capacitance will be higher
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Old 22nd July 2013, 01:21 PM   #79
kenpeter is offline kenpeter  United States
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Yeah, that symbol is drawn a bit weird.
Channel arrow looks like N, but gate connection oriented like P.
Suppose I should still have read that as N, just tripped me up.

If thats really a symbol for N? You probably can't direct couple.
Unless you gonna run the plate at some crazy low voltage...
Would have to be below 1/2 B+, would not recommend.

Maybe i nitpick over nothing. Usual direct coupling is 1/3 B+.
With the other 2/3 devoted to the plate resistor, or plate and
cathode resistors. It works just fine, and always has..

I suggest the higher plate voltage offered by P, at 3/4 B+.
Resistor across VGS holding the plate at constant current.
Will find almost 1/2 B+ headroom either end can swing...

I don't know whats the headroom on the old way? Has to
be a lot less than 1/3, to leave something for the plate...

Last edited by kenpeter; 22nd July 2013 at 01:49 PM.
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Old 22nd July 2013, 01:57 PM   #80
kenpeter is offline kenpeter  United States
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So, thats 4 advantages for P.

1) Direct coupling at 3/4 B+
2) Full use of B+ for headroom. 1/2 available each end.
3) Free CCS by strapping plate resistor across VBE or VGS
4) Equal impedance split, if we feed Drain/Mu back to Cathode

Last edited by kenpeter; 22nd July 2013 at 02:00 PM.
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