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From: Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net>
Newsgroups: sci.electronics.design
Subject: Re: Fast monostable with a transistpor array
Date: Sat, 15 Jun 2024 16:03:21 -0000 (UTC)
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john larkin <jl@650pot.com> wrote:
> On Sat, 15 Jun 2024 00:47:00 -0400, bitrex <user@example.net> wrote:
> 
>> On 6/14/2024 7:10 PM, john larkin wrote:
>>> On Fri, 14 Jun 2024 16:35:59 -0400, bitrex <user@example.net> wrote:
>>> 
>>>> On 6/14/2024 12:33 PM, john larkin wrote:
>>>>> On Fri, 14 Jun 2024 12:18:23 -0400, "Edward Rawde"
>>>>> <invalid@invalid.invalid> wrote:
>>>>> 
>>>>>> "john larkin" <jl@650pot.com> wrote in message
>>>>>> news:8epo6jhf5k5nbkkqp5ot9b6nq1lhoia870@4ax.com...
>>>>>>> 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!
>>>>>>> 
>>>>>>>> 
>>>>>>>>> 
>>>>>>>>> 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.
>>>>>> 
>>>>>> If it's obsolete or going obsolete then yes it would make no sense to use it.
>>>>>> I would guess that you get to do plenty of work because a
>>>>>> manufacturer has suddenly decided to discontinue a 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.
>>>>>> 
>>>>>> What part would you recommend (single or dual) and does it have a
>>>>>> working LTSpice model?
>>>>> 
>>>>> Just pull up some parts from the standard library, some low current
>>>>> NPNs like BC547 maybe. Look for low capacitances if you care about
>>>>> that; the HFAs are good in that respect.
>>>>> 
>>>>> Why do people avoid making clean 4-wire connections on schematics?
>>>> 
>>>> There's this new trend of breaking the circuit schematic up into little
>>>> boxes like this, it's nuts:
>>>> 
>>>> <https://hackaday.com/wp-content/uploads/2024/05/hadimg_desrev_ltc4040_6.png>
>>>> 
>>>> 
>>> 
>>> That's criminal.
>>> 
>> 
>> Combining schematics and documentation in the same document is sort of 
>> like a toothpaste and orange juice smoothie. I like orange juice, and 
>> toothpaste is useful. However...
> 
> We keep a separate design notes folder. It can say a lot more than
> could be hacked onto a schematic. I don't like a lot of comments on my
> schematics.
> 
> 

I often annotate schematics with things like nominal voltages, dashed
rectangles to indicate circuit groups, and anything unusual that might be
mistaken for an error, such as a BJT used upside-down. 

Makes it easier for others to understand. 

(We also keep notes, markups from bringup, and so on. )

Cheers 

Phil Hobbs 

-- 
Dr Philip C D Hobbs  Principal Consultant  ElectroOptical Innovations LLC /
Hobbs ElectroOptics  Optics, Electro-optics, Photonics, Analog Electronics