Path: ...!Xl.tags.giganews.com!local-1.nntp.ord.giganews.com!nntp.supernews.com!news.supernews.com.POSTED!not-for-mail NNTP-Posting-Date: Fri, 14 Jun 2024 19:59:36 +0000 From: john larkin Newsgroups: sci.electronics.design Subject: Re: Fast monostable with a transistpor array Date: Fri, 14 Jun 2024 12:59:37 -0700 Message-ID: <778p6jli5d9ba92cag0pl4pcsl22qphm2s@4ax.com> References: <8epo6jhf5k5nbkkqp5ot9b6nq1lhoia870@4ax.com> User-Agent: ForteAgent/8.00.32.1272 MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Lines: 52 X-Trace: sv3-CPHeMqG947u9eEmf2AAV3htJy9J+pcmRjJq/tUnjZIBsoNGihtbuEAPqnR14iN21JVPY1ANmR0fLlYB!Oe/gmdTPNXo8UGDCElYbArn73lpZAzkHbLZ24AHQWLaYN4/OOTtdemzrohWxyQiibhQZJ61xvg3W!nQ+NLQ== X-Complaints-To: www.supernews.com/docs/abuse.html X-DMCA-Complaints-To: www.supernews.com/docs/dmca.html X-Abuse-and-DMCA-Info: Please be sure to forward a copy of ALL headers X-Abuse-and-DMCA-Info: Otherwise we will be unable to process your complaint properly X-Postfilter: 1.3.40 Bytes: 3404 On Fri, 14 Jun 2024 15:50:31 -0400, "Edward Rawde" wrote: >"piglet" 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" >>> wrote: >>> >>>> >>>> "john larkin" wrote in message news:hilo6j9dgctalpiu4v09rpdavf6fetm1cv@4ax.com... >>>>> On Thu, 13 Jun 2024 23:25:37 -0400, "Edward Rawde" >>>>> wrote: >>>>> >>>>>> "Bill Sloman" 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! >>> >> >> Yeah, there is something very wrong with that transistor model. >> >> 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? >> > >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. > >NSVF6001SB6T1G looks interesting but no sign of a model other than symbol, footprint and 3D that I can find. > I like BFS17. It's fast, but not so fast as to get cranky. It generally behaves.