Path: ...!eternal-september.org!feeder3.eternal-september.org!news.eternal-september.org!.POSTED!not-for-mail From: Bill Sloman Newsgroups: sci.electronics.design Subject: Re: fast NPN in LT Spice Date: Mon, 3 Jun 2024 17:18:15 +1000 Organization: A noiseless patient Spider Lines: 205 Message-ID: References: <4n2q5jln0sb9oqbfp81jm723tbjf7tol80@4ax.com> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Injection-Date: Mon, 03 Jun 2024 09:18:16 +0200 (CEST) Injection-Info: dont-email.me; posting-host="e1fda1ec3d2b12296ec6c735d129fb70"; logging-data="3993452"; mail-complaints-to="abuse@eternal-september.org"; posting-account="U2FsdGVkX19SoJ68a1LvjI2OacDzPm6ST3apaX6MhMs=" User-Agent: Mozilla Thunderbird Cancel-Lock: sha1:thhf5e85qe+8JvJJC02/CY6C4+g= Content-Language: en-US In-Reply-To: Bytes: 6689 On 3/06/2024 1:22 pm, john larkin wrote: > On Sun, 2 Jun 2024 20:35:02 -0400, "Edward Rawde" > wrote: > >> "john larkin" wrote in message news:4n2q5jln0sb9oqbfp81jm723tbjf7tol80@4ax.com... >>> On Sun, 2 Jun 2024 19:46:14 -0400, "Edward Rawde" >>> wrote: >>> >>>> "john larkin" 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 ========== REMAINDER OF ARTICLE TRUNCATED ==========