From: jrwalliker@gmail.com   
      
   On 26/11/2025 21:25, Joe Gwinn wrote:   
   > On Wed, 26 Nov 2025 09:00:32 -0800, john larkin    
   > wrote:   
   >   
   >> On Wed, 26 Nov 2025 16:24:52 GMT, Jan Panteltje    
   >> wrote:   
   >>   
   >>>> Bill Sloman wrote:   
   >>>>> On 26/11/2025 8:16 pm, Jan Panteltje wrote:   
   >>>>>> "Tom Del Rosso" wrote:   
   >>>>>>> john larkin wrote:   
   >>>>>>>   
   >>>>>>> Good on-chip oscillators would be cool, on uPs and FPGAs.   
   >>>>>>   
   >>>>>> I have an electric oven that seems to use the on-chip oscillatior. The   
   >>>>>> clock gains a few minutes a day. Thay could have omitted the clock and   
   >>>>>> no one would miss it.   
   >>>>>   
   >>>>> On chip oscillators are temperature dependent   
   >>>>   
   >>>> But some more so that others. I had cheap Casio watch that I bought in   
   >>>> the 1980's and it went through three lithium batteries until I managed   
   >>>> to leave it in the washing machine a couple of years ago, which wrecked   
   it.   
   >>>   
   >>> https://casiosupport.zendesk.com/hc/en-us/articles/360000101   
   32-Quartz-movemCASIO AMERICA, INC. Watches Atomic/WaveCeptor   
   >>> All Casio watches have Quartz movements.   
   >>>   Quartz-is powered by an electronic oscillator synchronized by quartz   
   crystal.   
   >>>   The electric current causes the quartz inside to pulsate with a precise   
   frequency   
   >>   
   >> Probably all watches now have an off-chip quartz tuning-fork   
   >> resonator, usually 2^15 Hz. MEMS resonators are getting pretty good   
   >> lately, and the resonator and the oscillator circuit can be on the   
   >> same silicon chip, so I expect MEMS watches soon.   
   >   
   > The thing to watch is Bragg mirror resonators operating in the GHz,   
   > which are very stable and immune to acceleration.  I forget the name   
   > of the maker.   
      
   TI.  They operate at 2.5GHz and divide down to the specified output   
   frequency.   
      
   https://www.ti.com/lit/ds/symlink/lmk6c.pdf   
      
   >   
   >   
   >> Bulova once made a watch that used a low frequency tuning fork   
   >> resonator that directly operated a tiny ratchet.   
   >>   
   >> Given that everybody carries a phone now, why have a watch?   
   >   
   > My phone is in my pants pocket, often awkward to get out to use,   
   > especially when driving.  Glancing at a wristwatch is far easier.  Nor   
   > does a simple wristwatch get confused or hacked.   
   >   
   > Joe   
      
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