help on crystal oscillator design

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arsenal

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Thank you for your attention.
I have some questions on pierce crystal oscillator design,and eager for your help!
Can I use a CMOS transmission gate to act as the resistor? If not, then what are the disadvantages?
If I use an external resistor, then what are the disadvantages as compared to the usage of an internal resistor?
 

This is commonly done when operating on low supply rails. I mentioned this here

E
 

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