Path: ...!news-out.netnews.com!postmaster.netnews.com!us3.netnews.com!not-for-mail X-Trace: DXC=:XQMTCU5[F2hIijDO7J470dMQQ7KJ4R`5ADBYnBZ7F X-Complaints-To: support@frugalusenet.com Date: Mon, 9 Sep 2024 16:32:13 -0400 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: Ye olde bootstrappe buffere Newsgroups: sci.electronics.design References: <66df3030$3$1787$882e4bbb@reader.netnews.com> Content-Language: en-US From: bitrex In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Lines: 20 Message-ID: <66df5b4d$0$3620710$882e4bbb@reader.netnews.com> NNTP-Posting-Host: 127.0.0.1 X-Trace: 1725913933 reader.netnews.com 3620710 127.0.0.1:46689 Bytes: 1536 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. >> >> 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. >> >> It's definitely not expensive, anyway: >> >> >> > 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..