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From: Bill Sloman <bill.sloman@ieee.org>
Newsgroups: sci.electronics.design
Subject: Re: fast NPN in LT Spice
Date: Mon, 3 Jun 2024 17:18:15 +1000
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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.

Version 4
SHEET 1 2924 1040
WIRE 128 -720 -768 -720
WIRE 304 -720 128 -720
WIRE 656 -720 304 -720
WIRE 1088 -720 656 -720
WIRE 1376 -720 1088 -720
WIRE 1584 -720 1376 -720
WIRE 1088 -576 1088 -720
WIRE 1376 -576 1376 -720
WIRE 128 -560 128 -720
WIRE 304 -560 304 -720
WIRE 656 -560 656 -720
WIRE 1584 -544 1584 -720
WIRE 1088 -400 1088 -496
WIRE 1088 -400 960 -400
WIRE 1248 -400 1088 -400
WIRE 960 -368 960 -400
WIRE 1248 -352 1248 -400
WIRE 656 -320 656 -480
WIRE 896 -320 656 -320
WIRE 1376 -304 1376 -496
WIRE 1376 -304 1312 -304
WIRE 128 -288 128 -480
WIRE 176 -288 128 -288
WIRE 304 -288 304 -480
WIRE 304 -288 240 -288
WIRE 656 -208 656 -320
WIRE 1376 -192 1376 -304
WIRE 1584 -192 1584 -480
WIRE 1584 -192 1376 -192
WIRE 304 -160 304 -288
WIRE 448 -160 304 -160
WIRE 592 -160 448 -160
WIRE -768 -64 -768 -720
WIRE 128 48 128 -288
WIRE 1376 48 1376 -192
WIRE -272 96 -432 96
WIRE 64 96 -192 96
WIRE 304 160 304 -160
WIRE 448 176 448 -160
WIRE -432 240 -432 96
WIRE -768 416 -768 16
WIRE -768 416 -880 416
WIRE -736 416 -768 416
WIRE -432 416 -432 320
WIRE -432 416 -736 416
WIRE 304 416 304 240
WIRE 304 416 -432 416
WIRE 960 416 960 -272
WIRE 960 416 304 416
WIRE 1376 416 1376 128
WIRE 1376 416 960 416
WIRE 1424 416 1376 416
WIRE 1520 416 1424 416
WIRE 128 464 128 144
WIRE 656 464 656 -112
WIRE 656 464 128 464
WIRE 1424 480 1424 416
WIRE -880 496 -880 416
WIRE 656 496 656 464
WIRE 1248 624 1248 -256
WIRE 1296 624 1248 624
WIRE 1424 624 1424 560
WIRE 1424 624 1296 624
WIRE -736 640 -736 416
WIRE -736 656 -736 640
WIRE 1424 688 1424 624
WIRE -736 944 -736 720
WIRE 448 944 448 256
WIRE 448 944 -736 944
WIRE 656 944 656 576
WIRE 656 944 448 944
WIRE 1424 944 1424 768
WIRE 1424 944 656 944
WIRE 1648 944 1424 944
FLAG -880 496 0
FLAG 1296 624 out
SYMBOL npn 64 48 R0
SYMATTR InstName Q1
SYMATTR Value BFR92A
SYMBOL npn 592 -208 R0
SYMATTR InstName Q2
SYMATTR Value BFR92A
SYMBOL voltage -768 -80 R0
WINDOW 123 0 0 Left 0
WINDOW 39 24 44 Left 2
SYMATTR SpiceLine Rser=0.1
SYMATTR InstName V1
SYMATTR Value 15.0
SYMBOL voltage -736 624 R0
WINDOW 123 0 0 Left 0
WINDOW 39 24 44 Left 2
SYMATTR SpiceLine Rser=0.1
SYMATTR InstName V2
SYMATTR Value 15.0
SYMBOL voltage -432 224 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V3
SYMATTR Value PULSE(0 .2 1n 300p 300p 100p 100n 2)
SYMBOL res -176 80 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R1
SYMATTR Value 27
SYMBOL res 640 480 R0
SYMATTR InstName R3
SYMATTR Value 3k0
SYMBOL res 112 -576 R0
SYMATTR InstName R4
SYMATTR Value 2k
SYMBOL res 288 144 R0
SYMATTR InstName R5
SYMATTR Value 100
SYMBOL res 640 -576 R0
SYMATTR InstName R6
SYMATTR Value 1k
SYMBOL res 288 -576 R0
SYMATTR InstName R2
SYMATTR Value 5k
SYMBOL cap 240 -304 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C1
SYMATTR Value 10p
SYMBOL res 432 160 R0
SYMATTR InstName R7
SYMATTR Value 7k5
SYMBOL pnp 1312 -256 R180
SYMATTR InstName Q3
SYMATTR Value 2N3906
SYMBOL pnp 896 -272 M180
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