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From: piglet <erichpwagner@hotmail.com>
Newsgroups: sci.electronics.design
Subject: Re: Fast monostable with a transistpor array
Date: Fri, 14 Jun 2024 18:59:59 +0100
Organization: A Patent noisesome spinner
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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?


Version 4
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TEXT -816 1112 Left 0 !.tran 100u
TEXT -120 976 Left 2 ;EPW SED JUN 2024
TEXT -264 1064 Left 2 ;FAST ASTABLE MULTIVIBRATOR
TEXT -120 1032 Left 2 ;EMITTER COUPLED
TEXT -144 848 Left 1 ;TRADITIONALLY SHOWN WITH
TEXT -176 872 Left 1 ;CURRENT SOURCES FOR EMITTERS
TEXT -160 896 Left 1 ;TRY CHANGING R3 R4 FOR 5mA ?
TEXT -152 552 Left 1 ;ALTERNATIVE OUTPUT CAN BE
TEXT -192 576 Left 1 ;TAKEN ACROSS R IN Q1 COLLECTOR


piglet