Path: ...!weretis.net!feeder9.news.weretis.net!usenet.blueworldhosting.com!diablo1.usenet.blueworldhosting.com!nnrp.usenet.blueworldhosting.com!.POSTED!not-for-mail From: "Edward Rawde" Newsgroups: sci.electronics.design Subject: Re: Fast monostable with a transistpor array Date: Fri, 14 Jun 2024 15:19:08 -0400 Organization: BWH Usenet Archive (https://usenet.blueworldhosting.com) Lines: 75 Message-ID: References: <8epo6jhf5k5nbkkqp5ot9b6nq1lhoia870@4ax.com> Injection-Date: Fri, 14 Jun 2024 19:19:10 -0000 (UTC) Injection-Info: nnrp.usenet.blueworldhosting.com; logging-data="16155"; mail-complaints-to="usenet@blueworldhosting.com" Cancel-Lock: sha1:LhOkIK0wT8GG0kz3Rw0RwK9nsEI= sha256:6TqfsJrn2knPtingIh+m2cjBPvtXHu3cNRo9m+W45sM= sha1:dvkvevyedW6Vf8lwk7Fo0ib8Ll8= sha256:gTMQr/XueqoMTnmy6F9dt5qSxcgPmkmNmf4bBnq6PlI= X-Newsreader: Microsoft Outlook Express 6.00.2900.5931 X-Priority: 3 X-MSMail-Priority: Normal X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.6157 X-RFC2646: Format=Flowed; Original Bytes: 4580 "john larkin" wrote in message news:m7uo6jhfuobfcjaps5o6hatlnm6ntnv84m@4ax.com... > On Fri, 14 Jun 2024 12:44:33 -0400, "Edward Rawde" > wrote: > >>"john larkin" wrote in message news:viro6jlt7h02ehbsq20em8uv5snn3736up@4ax.com... >>> On Fri, 14 Jun 2024 12:18:23 -0400, "Edward Rawde" >>> wrote: >>> >>>>"john larkin" wrote in message news:8epo6jhf5k5nbkkqp5ot9b6nq1lhoia870@4ax.com... >>>>> 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! >>>>> >>>>>> >>>>>>> >>>>>>> There's no reason to use many-GHz parts in micropower circuits. One >>>>>>> reason is that the sim breaks. >>>>> >>>>> Most versions of the HFA3046 are obsolete. The only one left at >>>>> Digikey costs $12. It would be risky to design around that part. >>>> >>>>If it's obsolete or going obsolete then yes it would make no sense to use it. >>>>I would guess that you get to do plenty of work because a manufacturer has suddenly decided to discontinue a part. >>>> >>>>> Wasn't HFA originally a Harris part? >>>>> >>>>> There are lots of dual (non-monolithic) diodes and bipolars and fets >>>>> around, but the monolithic arrays are mostly gone. >>>> >>>>What part would you recommend (single or dual) and does it have a working LTSpice model? >>> >>> Just pull up some parts from the standard library, some low current >>> NPNs like BC547 maybe. Look for low capacitances if you care about >>> that; the HFAs are good in that respect. >> >>Yes but BC547 sounds almost as ancient as BC107 >>Are they still in production? > > It was just an example of a library part, but Digikey will sell you a > million pieces. > >>What would work well at a GHz or two or more? > > For switching? Tuned RF? I meant a specific npn part and maybe also pnp which is not going obsolete. >