[time-nuts] questions on uncompensated crystal oscillators

[Richard (Rick) Karlquist]

> The basic criterion are: 
>  - used with a VLSI inverter based oscillator with
>    3.3 V supply, but somewhat high impedance output. 

An inverter is not specified for oscillator duty.
It cannot be analyzed for this application on SPICE.
It will never be a high precision oscillator circuit.
(10 ppm is "high precision" when it comes to using inverters).
If you care about performance, use a transistor to make
the oscillator and use the inverter to convert the 
sine wave to logic levels.  If you "cannot" use a transistor,
relax your specs about an order of magnitude.

Rick Karlquist