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From: "Edward Rawde" <invalid@invalid.invalid>
Newsgroups: sci.electronics.design
Subject: Re: Fast monostable with a transistpor array
Date: Sat, 15 Jun 2024 12:23:58 -0400
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"legg" <legg@nospam.magma.ca> wrote in message news:m95r6jhkg2t0ivj4rcgommqljvb5v4ihhd@4ax.com...
> On Fri, 14 Jun 2024 09:03:03 -0700, john larkin <jl@650pot.com> 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!

Actually it does, see below.

>>
>>>
>>>>
>>>> There's no reason to use many-GHz parts in micropower circuits. One
>>>> reason is that the sim breaks.
>>
>>Most versions of the HFA3046 are obsolete. The only one left at
>>Digikey costs $12. It would be risky to design around that part.
>>Wasn't  HFA originally a Harris part?
>>
>>There are lots of dual (non-monolithic) diodes and bipolars and fets
>>around, but the monolithic arrays are mostly gone.
>>
>>The duals save space, but aren't well matched so are electrically and
>>thermally equivalent to buying two separate parts.
>>
>>I wonder if one could design really fast stuff with the HFA3046.
>>Package parasitics look nasty. And the big package will force ugly PCB
>>routing. You can plop a single tiny transistor wherever you want.
>>
>>The HFA parts are either 5 NPNs or 5 PNPs, which is also awkward.
>>
>>
>>
>
> The original simulation of the astable multivibrator was intended
> to demonstrate reasonable speed at low power.

Yes. It's not hard to find the original posts online.

>
> The model was published by Intersil in 1996 in app note MM3046.
>
> The simulation runs if properly typeset.

Thanks for pointing that out. You're absolutely right. Here is the corrected version.
As usual, line breaks will need to be fixed.

>
> RL

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
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WIRE 192 624 -64 624
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WIRE -128 688 -240 688
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WIRE -240 880 -256 880
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WIRE -208 912 -208 880
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WIRE -592 1008 -752 1008
WIRE -512 1008 -512 992
WIRE -512 1008 -592 1008
WIRE -208 1008 -208 976
WIRE -208 1008 -512 1008
WIRE 32 1008 32 928
WIRE 32 1008 -208 1008
WIRE -752 1040 -752 1008
FLAG -752 1040 0
FLAG 192 624 out
SYMBOL RES -608 544 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
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V1
SYMATTR Value 5
SYMBOL npn -32 832 R0
SYMATTR InstName Q1
SYMATTR Value NUHFARRY
SYMBOL npn -528 832 M0
SYMATTR InstName Q2
SYMATTR Value NUHFARRY
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 NUHFARRY
SYMBOL RES -256 544 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
========== REMAINDER OF ARTICLE TRUNCATED ==========