Mike Ciholas wrote:
Hi,
I have a challenging research project to build thousands, perhaps
millions, of devices that maintain mutual synchronization. The
devices need to be low cost (under $20 retail, $8 manufacturing),
small in size (key chain fob), and low power (operate at least 18
months on a battery). Synchronization ideally needs to be within
a second or two over a year but there is some leeway to trade
cost for performance here up to perhaps 10 seconds of variation
per year. Ideally, the device works anywhere in the world but we
may have to limit it to North America.
1. Crystal Modeling
Phase lock the crystal to the 50/60 Hz powerline? The signal seems
to be ubiquitous.
-Chuck
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