The author presents a cell based, super low power CMOS crystal oscillator with no external components. this oscillator provides a typical dynamic current of 200 nano amps at 3.0 volts battery. The oscillator tuning is accomplished by programming the 'on chips' variable input capacitors. It is totally nonvolatile with over ten years of operation from a single 3.0 volt lithium battery. It has been fabricated in both 3 mu , p- well and 1.5 mu , n-well technologies.
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