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Old 3rd December 2012, 10:05 PM   #7891
sampler is offline sampler  Lithuania
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Quote:
Originally Posted by Stefanoo View Post
Interesting.
Would you mind elaborate the circuit with IRF9610?
Replace ZVP4525 with IRF9610 or any other Pmos with reasonably low Coss and bias it properly for required current.
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Apparetly circuit doesn't seem to operate in my simulator.
Sorry to hear that.
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Also, if you don't mind where did you get the model for the gyrator?
I have never used this device before.
Not sure what you mean, but ZVP4525 spice model can be found here.
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Old 3rd December 2012, 10:05 PM   #7892
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Originally Posted by Joachim Gerhard View Post
Well, it is more like doubled, anyway.
yes I see your point.
I was looking at one of the link you posted before and made me want to use the IF3601 for this
The dual package monolithic will achieve an extremely low noise and thermally coupled if CCS is stable should lead to a simple but extreely low noise and thermally stable design.
What do you think?

Anyway like I said I would like to have the model up on my simulator to be able to make modifications for everybody.

Otherwise sampler could be doing that work if he feels like, I don't mind doing it if he is busy.
Still I would like an explanation as to why his model works is it because of the current set on the CCS?

EDIT: Thanks Sampler for the extra info, I will try to see if I can work this issue out.
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Old 3rd December 2012, 10:14 PM   #7893
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The IF3901 is like a pink elephant or a unicorn if you wish.
Can not wait until you get some Stefano.
The CSS has to provide THE EXACT SAME CURRENT THEN THE INPUT STAGE PROVIDES AT IDDLE, ALL THE TIME. If that does not happen the DC voltage at the output node is not EXACTLY at 1/2 voltage of the supply. That condition gives the MAXIMUM DYNAMIC RANGE ( Tietze- Schenk ).

Last edited by Joachim Gerhard; 3rd December 2012 at 10:24 PM.
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Old 3rd December 2012, 10:15 PM   #7894
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Tietze-Schenk Homepage
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Old 3rd December 2012, 10:17 PM   #7895
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High Way the Hard Way :Tietze-Schenk Homepage
There is an english edition.
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Old 3rd December 2012, 10:21 PM   #7896
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Richard Dobson - Hard By The Highway - YouTube
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Old 3rd December 2012, 10:30 PM   #7897
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It is wise to use P-Channel Mosfets, Sampler. They are much less noisy then the N-Cannel variety.
You can find that here :Analog Design Essentials, Sansen
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Old 3rd December 2012, 10:41 PM   #7898
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Here we go.Secrets of the Beehive - Wikipedia, the free encyclopedia
Attached Images
File Type: png noise.png (81.8 KB, 129 views)
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Old 3rd December 2012, 10:43 PM   #7899
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Question :
What kind of P-Channel Mosfet has the least noise provided that you run it on 10 times the idle then a comparable BJT ?
You can win one bottle of Los Royales Reserva 2007.
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Old 3rd December 2012, 10:50 PM   #7900
FdW is offline FdW  Netherlands
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Quote:
Originally Posted by Joachim Gerhard View Post
Question :
What kind of P-Channel Mosfet has the least noise provided that you run it on 10 times the idle then a comparable BJT ?
You can win one bottle of Los Royales Reserva 2007.
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
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