[time-nuts] how to find low noise transistors

[Azelio Boriani]

Yes, I'm with Bob Pease: the soldering iron is my best simulation
tool. Nonetheless it is useful to know how to correctly extract the
coefficients to use in the best known among the simulation tools. In
one sci.electronics.design discussion, A. Lakovlev tells to have
determined the KF based on the datasheet's NF by trials and then
adjusted AF to follow the datasheet's NF variation with the collector
current. He ended up with KF= 5E-15 and AF= 1.13 for the 2SC3329, also
in this case the AF is greater than 1.

On Sun, Jul 19, 2015 at 4:41 PM,  <KA2WEU at aol.com> wrote:
> For HF to uW oscillators  if find these modeling efforts not adequate . Only
> a test circuit will show the prove...
>
> Ulrich N1UL
>
> In a message dated 7/19/2015 10:36:10 A.M. Eastern Daylight Time,
> azelio.boriani at gmail.com writes:
>
> For a method to extract AF and KF try this:
> <http://joerg-berkner.de/Fachartikel/pdf/2000_AKB_Berkner_1f_noise.pdf>
>
> see also
> <http://scholarcommons.usf.edu/cgi/viewcontent.cgi?article=2270&context=etd>
> from page 55, on the parameter extraction for the BJTs
>
> usually AF is greater than 1, as you can see in this appnote from CEL:
> <http://www.cel.com/pdf/appnotes/an1026.pdf>
>
> A SILVACO appnote on how to model for SPICE2 for 1/f (from page 45):
> <http://www.silvaco.com/content/kbase/noise_modeling.pdf>
>
> On Sun, Jul 19, 2015 at 4:59 AM, John Miles <john at miles.io> wrote:
>>
>>> -----Original Message-----
>>> From: time-nuts [mailto:time-nuts-bounces at febo.com] On Behalf Of KA2WEU--
>>> - via time-nuts
>>> Sent: Saturday, July 18, 2015 3:40 PM
>>> To: time-nuts at febo.com
>>> Cc: akpoddar at synergymwave.com; Alexander.Roth at rohde-schwarz.com
>>> Subject: Re: [time-nuts] how to find low noise transistors
>>>
>>> BFG540
>>>
>>>
>>
>> That's what I mean -- both BFG540 and BFG591 have been discontinued by
>> NXP.  Guess they don't sell enough of them these days.
>>
>> -- john, KE5FX
>> Miles Design LLC
>>
>>
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