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Old 4th December 2012, 07:29 AM   #7911
FdW is offline FdW  Netherlands
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Quote:
Originally Posted by Joachim Gerhard View Post
Frans, a PM send.
You get an older bottle anyway.
Joachim, you make me look like some kind of an expert thanks.
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Old 4th December 2012, 09:45 AM   #7912
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I really do not know, but if I was guessing I would go like this, the larger the mosfet the better in actual fact a large (hexfet) mosfet is a matrix of paralleled fets and thus the more in parallel the better. Thus I think the larger the dye the better. Just my guestimate! You know where to send that bottle
Some research and I found:
Quote:
The current path is created by inverting the p-layer underneath the gate by the identical method in
the lateral MOSFETs. Source current flows underneath this gate area and then vertically through
the drain, spreading out as it flows down. A typical MOSFET consists of many thousands of N+
sources conducting in parallel. This vertical geometry makes possible lower on-state resistances
(RDS(on)) for the same blocking voltage and faster switching than the lateral MOSFETs.
In http://www12.fairchildsemi.com/an/AN/AN-558.pdf

The number of parallell fets is 'many thousands'

Last edited by FdW; 4th December 2012 at 09:48 AM.
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Old 5th December 2012, 04:33 PM   #7913
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this last post definitely sealed the deal!!! No more comments? No more progresses on the last circuit?

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Old 5th December 2012, 05:10 PM   #7914
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We are working in the background but i simply had no time to try more.
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Old 5th December 2012, 06:05 PM   #7915
RCruz is offline RCruz  Switzerland
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For two days we have hard snow here.... My vehicle decided to stall... I have been updating my automotive knowledge... after verifying the fuel pump does produce enough pressure to the rail, I got a clue from a friend and focused myself in the electric circuit.... finally found the issue... bad ignition coil... Today, another highly stressed morning... had to climb a hill to borrow a car from another friend... transport kid and wife to the plain, go shop for a coil, get back, replace the coil... car starts... loose fixing nuts... go to garage, borrow magnetic tool, find nuts... fix everything... One of my students gave up classes.... today is payday... lots of €€ transfers... barely enough... so no time for pushing you guys
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Old 5th December 2012, 06:13 PM   #7916
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I am sorry to hear that but we live in a high snow - cold weather area too.
I certainly know that kind of problems. Anyway, life goes on.
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Old 5th December 2012, 06:15 PM   #7917
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Yes... my life is a permanent change... I like it
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Old 5th December 2012, 06:17 PM   #7918
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Good, let no external influence disturb your good mood, we need you here.
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Old 5th December 2012, 07:12 PM   #7919
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I allready learned how to enjoy each moment in life.... so even climbing the hill under heavy snow seemed like revigorating to me
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Old 5th December 2012, 07:16 PM   #7920
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that's the good spirit Ricardo!!!!

Now to comment on some progresses I made on the design, do you guys still remember the one shot approach?

I modeled it up as it seems to be a pretty nice circuit.
it can be easily obtained 62dB out of it, non-inverting topology.
However Noise simulation would seem to rule this out. Below is the noise simulation's result.
Residual noise would be comparable to a modified paradise without ElCap which sounds wonderful, but IMHO noise is unacceptable.
Some reasonable noise level could be 0.7nV/rtHz.

Any comment? Is it possible to fix this?
Attached Images
File Type: jpg sim-oneshot.JPG (188.6 KB, 141 views)
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