Re: Ye olde bootstrappe buffere

On 9/9/2024 2:44 PM, piglet wrote:

On 09/09/2024 6:28 pm, bitrex wrote:

Looks promising, with a midband gain of about 0.97.
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Use a PNP/JFET cascode as the slower input (as I guess sub-GHz PNPs is all we have, now) and fast NPNs on the output.
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It's definitely not expensive, anyway:
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<https://imgur.com/a/MTh2kl7>
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What does the JFET get you that an NPN BJT in that position wouldn't do?
 piglet
 

An NPN there seems to cause some appreciable peaking around the HF cutoff, though I haven't dug into this topology far enough to understand exactly why..