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Old 6th December 2012, 06:25 PM   #7961
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Quote:
Originally Posted by as-audio View Post
FYI this is Fig. 2 of US patent 5389889 by Towne et al., Allegro Microsystems Inc.

Temperature-compensated current source for use in a hall analog magnetic-field detector - Allegro Microsystems, Inc.
yes that is what I found.
Like I said similar to the idea I had but this works for CCS.
What do you think?

EDIT: have you used this since you had link available right away? Does it work well?
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Old 6th December 2012, 06:28 PM   #7962
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I have seen the Bartola Gyrator. Depletion mosfets can also being run on fixed bias.
That could help to stabilize drift. I have the depletion CCS on my bench and could try this rather fast.
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Old 6th December 2012, 06:31 PM   #7963
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Quote:
Originally Posted by Stefanoo View Post

EDIT: have you used this since you had link available right away? Does it work well?
Since you claim it "is a very good idea for a temp compensated CCS" I thought you tried it ?
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Old 6th December 2012, 06:32 PM   #7964
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Stefano, you could try to build your solution and i will setup the Bartola CCS.
That is easier for me because i have the DN2540 allraedy on the bread board.
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Old 6th December 2012, 06:39 PM   #7965
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Quote:
Originally Posted by Joachim Gerhard View Post
Stefano, you could try to build your solution and i will setup the Bartola CCS.
That is easier for me because i have the DN2540 allraedy on the bread board.
sounds good...
I will try to build it tonight.
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Old 6th December 2012, 06:40 PM   #7966
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Quote:
Originally Posted by as-audio View Post
Since you claim it "is a very good idea for a temp compensated CCS" I thought you tried it ?
No I didn't. I meant to say that it looks like a clever idea and IMHO has potential to work.
I mean logic is straightforward and wouldn't see why it wouldn't work.
How it sounds, I have no clue.
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Old 6th December 2012, 06:51 PM   #7967
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Maybe this is easier to bias although Gm is lower then in the bigger one :http://documentation.renesas.com/doc...22_2sj76ds.pdf
Unfortunately this is an EOL product.
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Old 6th December 2012, 07:21 PM   #7968
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I found this, very similar to my original design :http://bildarkiv.hififorum.nu/Ryssen...-CCS-beta2.pdf
In his book he mentions an HF / RF transistor with very low output capacitance.
Have to look it up.
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Old 6th December 2012, 07:31 PM   #7969
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Joachim your link does not work...
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Old 6th December 2012, 07:32 PM   #7970
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True.
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