Re: Fast monostable with a transistpor array

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:
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"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:
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"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.