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From: john larkin <jl@650pot.com>
Newsgroups: sci.electronics.design
Subject: Re: Fast monostable with a transistpor array
Date: Sat, 15 Jun 2024 07:49:13 -0700
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On Fri, 14 Jun 2024 23:41:13 -0400, "Edward Rawde"
<invalid@invalid.invalid> wrote:

>"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:
>>
>>>"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:
>>>>
>>>>>"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.
>>>>>>>>>>>
>>>>>>>>>>> It offers three 8GHz NPN parts and two 5.5GHz PNP parts in a single array.
>>>>>>>>>>>
>>>>>>>>>>> https://www.renesas.com/us/en/document/dst/hfa3046-hfa3096-hfa3127-hfa3128-datasheet?r=494216
>>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>> 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.
>>>>>>>>>>
>>>>>>>>>
>>>>>>>>> That is neither fast nor a monostable.
>>>>>>>>
>>>>>>>> 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.
>>>>>>>
>>>>>>> It doesn't work!
>>>>>>>
>>>>>>
>>>>>> Yeah, there is something very wrong with that transistor model.
>>>>>>
>>>>>> 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?
>>>>>>
>>>>>
>>>>>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.
>>>>>
>>>>>NSVF6001SB6T1G looks interesting but no sign of a model other than symbol, footprint and 3D that I can find.
>>>>>
>>>>
>>>> I like BFS17. It's fast, but not so fast as to get cranky. It
>>>> generally behaves.
>>>
>>>But looks like it's going obsolete. 55GN01FA is on the list of alternatives.
>>>
>>>>
>>>>
>>>
>>
>> Digikey shows two active sources. My inventory program shows MMBTH10
>> as an alternate.
>>
>> 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.

Small rocks maybe.


>
>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
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