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From: john larkin <jl@650pot.com>
Newsgroups: sci.electronics.design
Subject: Re: Yttrium iron garnet
Date: Thu, 30 May 2024 07:04:36 -0700
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On Thu, 30 May 2024 11:03:19 GMT, Glen Walpert <nospam@null.void>
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
>>>> <cd999666@notformail.com> 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 guessing they've been completely superseded by now to get to ever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:
>
><https://www.microwavejournal.com/articles/37980-reinventing-yig-
>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.