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The gm of the inverter was my first concern. But I tuned the bias current by +/-25%, it did not change anything. The good chip is still good, bad is still bad. The gm is 3.9/4.9/5.6m correspondingly(by simulation). Humungus, do you have an idea what the typical gm should be?
I also suspected...
I used the EPson TSX-3225 crystal. The oscillator includes a NMOS amplifer with PMOS current source and a 900k feedback res.
Now the chips come back, some oscillors work, but some not. After I swaped the crystal, the good chip is still good, the bad is still bad, which means the crystal is...
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