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Old 13th September 2012, 04:28 PM   #1781
Zoran is offline Zoran  Serbia
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does anybodu have a Spice model for SS jfets?
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Old 13th September 2012, 04:35 PM   #1782
flg is offline flg  United States
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Do you realize what is effectively inside the TL device? A zener and an opamp with lotsa gain
Sayin it's better without any reason or data is dumb! Yep you ZM!
Sayin below 100Hz the JFET and Zd is better without any circuit description etc. etc. is just as dumb as ZM!
Sorry
I need more convincing info than a basic sim and a Dummy...
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Old 13th September 2012, 04:37 PM   #1783
flg is offline flg  United States
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Quote:
Originally Posted by Zoran View Post
does anybodu have a Spice model for SS jfets?
I don't but, some have said they do. Try the www.site? Or search...
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Old 13th September 2012, 04:43 PM   #1784
lhquam is offline lhquam  United States
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I have been using the Spice model referred to in this post:
SemiSouth Spice models?

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does anybodu have a Spice model for SS jfets?
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Old 13th September 2012, 04:47 PM   #1785
flg is offline flg  United States
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Quote:
Originally Posted by lhquam View Post
You appear to be correct about that. Here is a Spice simulation of the two. The plot shows the ripple rejection of the two approaches. As you can see, the LED+CCS has a much lower corner frequency than the TL and is about 16dB better at frequencies about 100Hz.
I don't know. Must be Dumber than me? I read: Led+ccs VB2 ripple= 40uVp-p. Quite good in fact.
But, I also read:
TL431 VB1 ripple=17uVp-p???
Who is Dumber? Forgive me ZM
Not tryin to be Dumber
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Old 13th September 2012, 04:53 PM   #1786
flg is offline flg  United States
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as far as below 100Hz, I think you might wanna play with the values biasing the TL part a little???
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Old 13th September 2012, 04:53 PM   #1787
lhquam is offline lhquam  United States
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Those captions are poorly stated. What they represent is the ripple rejection without the capacitors, which is the rejection of changes in the DC level of the power supply, ie. the ripple rejection at Zero Hz.

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I don't know. Must be Dumber than me? I read: Led+ccs VB2 ripple= 40uVp-p. Quite good in fact.
But, I also read:
TL431 VB1 ripple=17uVp-p???
Who is Dumber? Forgive me ZM
Not tryin to be Dumber
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Old 13th September 2012, 04:56 PM   #1788
flg is offline flg  United States
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I don't even know why I'm in this thread????
Don't get me wrong though. I want to know how good a bias ref the TL is??? and how to optimize for that purpose
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Old 13th September 2012, 05:19 PM   #1789
Zen Mod is offline Zen Mod  Serbia
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no big fuss

make it with whatever you want , as long it works



we are not going to hear difference between TL and LEDs , in bias nets

what If I'm gonna to use Jfet CCS + LM336-Z5 .........

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Old 13th September 2012, 05:47 PM   #1790
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