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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.I've spent that last four days in hospital with Covid-19 of the colon - dramatic when it started but tedious thereafter.
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
Two of the NPN parts could make up my emitter-coupled monostable, and the two PNP parts could level shift the output.
The Renesas website offers Spice models for both the NPN and the PNP transistors, which one could plug into an LTSpice simulation, at the cost of making it look too messy for the more sensitive designers to be able to look at.
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