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Old 17th August 2012, 03:23 PM   #121
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Would you mind showing pics. Thats sounds cool
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Old 17th August 2012, 03:44 PM   #122
EUVL is offline EUVL  Europe
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Want to know our secrets ?




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Old 17th August 2012, 04:11 PM   #123
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Very cool.
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Old 17th August 2012, 04:32 PM   #124
EUVL is offline EUVL  Europe
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Actually quite hot ...........




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Old 18th August 2012, 06:25 PM   #125
Horio is offline Horio  United States
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Very cool (or hot) indeed!
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Old 18th August 2012, 08:27 PM   #126
NicMac is offline NicMac  Italy
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Quote:
Originally Posted by EUVL View Post
So not one MOSFET yet properly measured, if that is the answer you are looking for.




Patrick
With all due respect this is not true!

Every single of the 1000+ MOSFETs have been properly curve traced up to 2.5A and I will publish the data here the coming days to involve the group in the process and the results obtained so far.
The MOSFETs have not yet been measured at 60˚C and I guess this must be what Patrick think is improper about my measurements, or the fact that I have not been using a XEN audio designed instrument

Stay tuned.

Nic
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Old 18th August 2012, 09:02 PM   #127
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My mosfets matched on the curve tracer are sharing very well. The N channel are within 1mV of each other across Rs, and the P channel are within 10mV. Funny thing is, that it is consistent across both channels. In other words, both N sets match basically perfectly, and both P channel parts are off only slightly, but the same if comparing two channels.
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Old 19th August 2012, 02:06 AM   #128
pchw is offline pchw  United States
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Quote:
Originally Posted by NicMac View Post
With all due respect this is not true!

Every single of the 1000+ MOSFETs have been properly curve traced up to 2.5A and I will publish the data here the coming days to involve the group in the process and the results obtained so far.
The MOSFETs have not yet been measured at 60˚C and I guess this must be what Patrick think is improper about my measurements, or the fact that I have not been using a XEN audio designed instrument

Stay tuned.

Nic
Hi Nic,

How do the N-P matching look with the preliminary curve tracing result?
Seriously, the more stringent matching can only reduce your "current yield", but by how much is going to be hard to predict.

Good work!!
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Old 19th August 2012, 04:22 AM   #129
EUVL is offline EUVL  Europe
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"properly measured" = measured under operating conditions
= 16V, 0~4A, 65C Tc.

Zhou Fang also matches at room temperature.
I chose my wordings carefully, "with due respect".




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Last edited by EUVL; 19th August 2012 at 04:29 AM.
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Old 19th August 2012, 08:28 AM   #130
NicMac is offline NicMac  Italy
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Originally Posted by pchw View Post
Seriously, the more stringent matching can only reduce your "current yield", but by how much is going to be hard to predict.
Good work!!
The current yield of N-P match may change if "proper" testing shifts the measured Vgs of N and P devices differentially. It may actually both increase or decrease the yield. Fortunately we will not need to predict anything as the experiment will be done

As you will know from the number of devices available to the GB the yield of tight NNNN and PPPP quads is virtually complete.
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