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NNTP-Posting-Date: Mon, 03 Jun 2024 13:59:24 +0000
From: john larkin <jl@650pot.com>
Newsgroups: sci.electronics.design
Subject: Re: fast NPN in LT Spice
Date: Mon, 03 Jun 2024 06:59:23 -0700
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On Mon, 3 Jun 2024 17:18:15 +1000, Bill Sloman <bill.sloman@ieee.org>
wrote:

>On 3/06/2024 1:22 pm, john larkin wrote:
>> On Sun, 2 Jun 2024 20:35:02 -0400, "Edward Rawde"
>> <invalid@invalid.invalid> wrote:
>> 
>>> "john larkin" <jl@650pot.com> wrote in message news:4n2q5jln0sb9oqbfp81jm723tbjf7tol80@4ax.com...
>>>> On Sun, 2 Jun 2024 19:46:14 -0400, "Edward Rawde"
>>>> <invalid@invalid.invalid> wrote:
>>>>
>>>>> "john larkin" <jl@650pot.com> wrote in message news:eqsp5jde87vqs6du4a7djoalag7kpkuhkr@4ax.com...
>>>>>> There are many NPNs in the standard LT Spice library.
>>>>>>
>>>>>> Does anyone know of a fast, RF type, transistor? It's hard to tell
>>>>>> from the jillion lines of fine-print parameters.
>>>>>
>>>>> https://www.google.com/search?q=".model+BFR92A"
>>>>>
>>>>>>
>>>>>> I want to make a model of the MC10EP89 gate.
>>>>>>
>>>>>
>>>>
>>>> That doesn't seem to be in the LT Spice library.
>>>>
>>>> 2SC3838K looks OK.
>>>>
>>>> It's hard to pick parts, discrete or ICs, from the library.
>>>
>>> Yes it would be nice if a description of the part as well as the part number could be included.
>>
>> A sortable column of Ft would be nice for transistors. Lacking that,
>> sorting on Vce helps spot the RF parts. Low voltage suggests RF.
>
>
>Here's a circuit that includes a 5GHz ft BFR92A, which a typical 
>broad-band transistor. I had to put in the Spice model into the .asc 
>file myself.
>There used to be quite a few of them around, but - as Phil Hobbs has 
>mentioned - most of them have gone obsolete. He has tracked down a 
>surviving PNP equivalent, but you won't need that to simulate ECL.
>
>It's not the first time I've posted such a .asc file here.

Gosh, what a hideous mess, in many respects.






>
>Version 4
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>WIRE 304 -720 128 -720
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>WIRE 1088 -720 656 -720
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>SYMBOL npn 592 -208 R0
>SYMATTR InstName Q2
>SYMATTR Value BFR92A
>SYMBOL voltage -768 -80 R0
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>SYMATTR Value 5k
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>SYMATTR Value 10p
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