Re: Fast monostable with a transistpor array

"john larkin" <jl@650pot.com> wrote in message news:jijp6jd83gito3ovhb9imlipp5str2ln9p@4ax.com...

On Fri, 14 Jun 2024 17:55:10 -0400, "Edward Rawde"
<invalid@invalid.invalid> wrote:
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"john larkin" <jl@650pot.com> wrote in message news:778p6jli5d9ba92cag0pl4pcsl22qphm2s@4ax.com...

On Fri, 14 Jun 2024 15:50:31 -0400, "Edward Rawde"
<invalid@invalid.invalid> wrote:
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"piglet" <erichpwagner@hotmail.com> wrote in message news:v4i0ev$304v8$1@dont-email.me...

On 14/06/2024 17:03, john larkin wrote:

On Fri, 14 Jun 2024 11:08:56 -0400, "Edward Rawde"
<invalid@invalid.invalid> wrote:
>

>
"john larkin" <jl@650pot.com> wrote in message news:hilo6j9dgctalpiu4v09rpdavf6fetm1cv@4ax.com...

On Thu, 13 Jun 2024 23:25:37 -0400, "Edward Rawde"
<invalid@invalid.invalid> wrote:
>

"Bill Sloman" <bill.sloman@ieee.org> wrote in message news:v4f2nm$2augj$1@dont-email.me...

One option John Larjkin doesn't seem to have explored is using Renesas HFA3096 five transistor array as basis for his
mononstable
and level shifter.
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It offers three 8GHz NPN parts and two 5.5GHz PNP parts in a single array.
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https://www.renesas.com/us/en/document/dst/hfa3046-hfa3096-hfa3127-hfa3128-datasheet?r=494216
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I put the NPN model parameters into a circuit designed by yourself.
It's late now but I got as far as Time step too small.
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That is neither fast nor a monostable.

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Yes ok it's an astable and certainly not intended to be fast.
It was intended only to see if the model worked. Nothing more.

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It doesn't work!
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Yeah, there is something very wrong with that transistor model.
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Here is an emitter coupled multivib that can run fast. Should be possible somehow to gate it into being a monostable - worst
case
wrap a latch around it so it runs just one pulse?
>

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Now we're getting somewhere. Thanks piglet. 2SC3838K typical ft 3.2 GHz and available.
However it's not recommended for new designs if you believe the rohm site.
So I wonder if it has a successor which is available.
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NSVF6001SB6T1G looks interesting but no sign of a model other than symbol, footprint and 3D that I can find.
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I like BFS17. It's fast, but not so fast as to get cranky. It
generally behaves.

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But looks like it's going obsolete. 55GN01FA is on the list of alternatives.
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Digikey shows two active sources. My inventory program shows MMBTH10
as an alternate.
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Mouser has a million BFS17s in stock.

Ok well let's hope the likes of Musk doesn't need them.

The rest of us might need a part which, as far as I can tell, doesn't have any signs of pending obsolescence.

To that end I went hunting for models of the 55GN01FA and managed to find the file 55GN01FA.mps which contains the PS (P Spice?)
parameter set.
After downloading another file (image) to make sure I knew my Yottas from my yoctos I converted that file to a model which is
accepted by LTSpice

Some model parameters were not accepted by LTSpice so they were removed. Namely LE LB LC Cbe Cbc Cce cc and Q1.AREA

The result was as follows.

The point of this is to test the 55GN01FA model. No-one is claiming that this is a monostable or that it is fast.

Version 4
SHEET 1 2848 1316
WIRE -592 512 -752 512
WIRE -240 512 -592 512
WIRE -64 512 -240 512
WIRE 32 512 -64 512
WIRE -64 528 -64 512
WIRE 32 528 32 512
WIRE -592 576 -592 512
WIRE -240 592 -240 512
WIRE -752 624 -752 512
WIRE -64 624 -64 608
WIRE 192 624 -64 624
WIRE 208 624 192 624
WIRE -64 640 -64 624
WIRE -240 688 -240 672
WIRE -128 688 -240 688
WIRE -592 704 -592 656
WIRE -464 704 -592 704
WIRE -384 704 -464 704
WIRE -240 704 -240 688
WIRE -240 704 -320 704
WIRE -464 736 -464 704
WIRE -240 736 -240 704
WIRE -64 768 -64 736
WIRE 32 768 32 608
WIRE 32 768 -64 768
WIRE -752 784 -752 704
WIRE -592 832 -592 704
WIRE 32 832 32 768
WIRE -512 880 -528 880
WIRE -464 880 -464 816
WIRE -464 880 -512 880
WIRE -448 880 -464 880
WIRE -384 880 -320 704
WIRE -320 880 -384 704
WIRE -240 880 -240 816
WIRE -240 880 -256 880
WIRE -208 880 -240 880
WIRE -32 880 -208 880
WIRE -208 912 -208 880
WIRE -512 928 -512 880
WIRE -592 1008 -592 928
WIRE -512 1008 -512 992
WIRE -512 1008 -592 1008
WIRE -208 1008 -208 976
WIRE 32 1008 32 928
WIRE 32 1008 -208 1008
WIRE -592 1040 -592 1008
WIRE 32 1040 32 1008
FLAG 32 1040 0
FLAG -592 1040 0
FLAG -752 784 0
FLAG 192 624 out
SYMBOL RES -608 560 R0
SYMATTR InstName R1
SYMATTR Value 1Meg
SYMBOL res 16 512 R0
SYMATTR InstName R10
SYMATTR Value 2Meg
SYMBOL cap -384 864 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C1
SYMATTR Value 1.5p
SYMBOL cap -256 864 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C2
SYMATTR Value 1.5p
SYMBOL VOLTAGE -752 608 R0
SYMATTR InstName V1
SYMATTR Value 5
SYMBOL npn -32 832 R0
SYMATTR InstName Q1
SYMATTR Value 55GN01FA
SYMBOL npn -528 832 M0
SYMATTR InstName Q2
SYMATTR Value 55GN01FA
SYMBOL res -256 720 R0
SYMATTR InstName R3
SYMATTR Value 4.7Meg
SYMBOL res -480 720 R0
SYMATTR InstName R4
SYMATTR Value 4.701Meg
SYMBOL cap -528 928 R0
SYMATTR InstName C3
SYMATTR Value 0.68p
SYMBOL cap -224 912 R0
SYMATTR InstName C4
SYMATTR Value 0.68p
SYMBOL npn -128 640 R0
SYMATTR InstName Q10
SYMATTR Value 55GN01FA
SYMBOL RES -256 576 R0
WINDOW 3 30 76 Left 2
SYMATTR Value 1Meg
SYMATTR InstName R2
SYMBOL RES -48 624 R180
WINDOW 0 36 76 Left 2
WINDOW 3 36 40 Left 2
SYMATTR InstName R11
SYMATTR Value 1Meg
TEXT -768 1176 Left 0 !.tran 0 150u 50u startup
TEXT -776 1112 Left 0 ;This example schematic is supplied for informational/educational purposes only.\nJuly 7, 2008 by Bill Sloman
(but blame the Q10 output stage on James Arthur).
TEXT -480 1176 Left 0 !.model 55GN01FA NPN\n+ IS = 959.8E-18 BF = 133.0 NF = 985.0E-3 VAF = 9.557\n+ IKF = 760.0E-3 ISE = 450.0E-15
NE = 1.810 BR = 28.89\n+ NR = 1.013 VAR = 1.700 IKR = 5.849E-3 ISC = 1.299E-15\n+ NC = 1.157 RB = 1.000 IRB = 910.0E-3 RBM =
910.0E-3\n+ RE = 510.0E-3 RC = 1.200 XTB = 0.000 EG = 1.110\n+ XTI = 3.000 CJE = 1.050E-12 VJE = 600.0E-3 MJE = 800.0E-3\n+ TF =
18.00E-12 XTF = 1.000 VTF = 1.000 ITF = 50.00E-3\n+ PTF = 0.000 CJC = 800.0E-15 VJC = 110.0E-3 MJC = 115.0E-3\n+ XCJC = 500.0E-3 TR
= 1.000E-9 FC = 500.0E-3
TEXT -32 1128 Left 0 ;Q2's collector is loaded by C2,\nlimiting risetime. Q10 isolates\nQ1's collector, allowing that node\nto
charge much more rapidly.\n \nQ10 doubles as a common-base\namplifier stage, further squaring up the\noutput from Q10's collector.\n
\nThe new output is taken from\nQ10's collector.\n \nJames Arthur, 9-Jul-2008
TEXT 208 696 Left 0 ;This circuit was originally\ndesigned by Bill Sloman and\nJames Arthur in 2008.\n \nThis circuit uses the
55GN01FA\nUsing a model which was derived\nfrom information found online\nby Edward Rawde in June 2024\n \nOh and exactly why do I
have\nto press Shift+Enter to write\nthis? Talk about frustration.\n \nMore importantly, there are\nno four way net crossovers\nwith
a single blob (Q10 base)\n \nFrequency of oscillation appears\nto be 117 KHz. Slightly lower than\nthe BFR92A which is obsolete.