Path: ...!Xl.tags.giganews.com!local-1.nntp.ord.giganews.com!nntp.supernews.com!news.supernews.com.POSTED!not-for-mail NNTP-Posting-Date: Thu, 30 May 2024 14:04:37 +0000 From: john larkin Newsgroups: sci.electronics.design Subject: Re: Yttrium iron garnet Date: Thu, 30 May 2024 07:04:36 -0700 Message-ID: References: User-Agent: ForteAgent/8.00.32.1272 MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Lines: 50 X-Trace: sv3-geMZ8BE36+mpVStw2eSdMCod/ENi8O0Z180ycMGlD7pCJFTnAV8FbX040YrOM49F6oNUY8jJutu1kl1!63pKrcqM8+1dYzqIJ70k3fMszX3EPOMrCDlVtXeolCGw3DCE2ycR2aDuL+2LGpRCjdp1+7BQR/FJ!li2A0w== 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: 3135 On Thu, 30 May 2024 11:03:19 GMT, Glen Walpert wrote: >On Thu, 30 May 2024 09:14:58 -0000 (UTC), Cursitor Doom wrote: > >> On Thu, 30 May 2024 15:45:21 +1000, Bill Sloman wrote: >> >>> On 30/05/2024 3:37 am, john larkin wrote: >>>> On Wed, 29 May 2024 17:12:21 -0000 (UTC), Cursitor Doom >>>> wrote: >>>> >>>>> On Wed, 29 May 2024 13:52:34 +1000, Bill Sloman wrote: >>>>> >>>>>> Yttrium iron garnet tuned oscillators were around back then, but >>>>>> their 2GHz to 8GHz range was too high for me to count with the >>>>>> integrated circuits around then - we had to go the Gigabit Logic's >>>>>> GaAs parts to get to 800MHz, and that became the unique selling >>>>>> point of the system. >>>>> >>>>> YIG oscillators were quite the thing back in the day, but I'm >>>>> guessing they've been completely superseded by now to get to ever >>>>> higher frequencies. Seems we've gone from - >>> >>> This misses Jan Panteltje's thread "Small magnetic tunable filter for >>> 6G and beyond" which is about Yig being used today. >> >> That article makes it seem like YIG is some revolutionary, new, emerging >> technology! > >Use of YIG filters as a replacement for varactor tuning could turn out to >be significant. 2022 Microwave Journal article: > >technology-for-microwave-filter-applications> The VIDA oscillators still look like giant expensive power hogs. They don't specify modulation bandwidth on the data sheets that I see, but it must be terrible. One can't modulate a hundreds-of-mA electromagnet very fast. An LC osc with a varicap is a more sensible VCO. Narrowband, one can varicap a coaxial ceramic resonator, or a PCB ring oscillator, or something. Cheap and fast. Of course, it's inherently difficult to modulate a high-Q resonator fast, even without an electromagnet in the way.