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Trouble to startup Colpitts Crystal Oscillator while easy with Pierce (Read 992 times)

neoflash

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Trouble to startup Colpitts Crystal Oscillator while easy with Pierce
Oct 20^th, 2009, 7:01pm

Hi Folks:

I'm coming up with a strange issue with Xtal oscillator. With Colpitts design, the Xtal is hard to compensate and the oscillation will not sustain.

However, the same X-tal model with similar transistor size and current, the pierce version can work pretty well.

I've attached both schematics on and hope you can help me analyze the problem.

Regards,
Neo

colp2.JPG

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neoflash Community Fellow Offline Mixed-Signal Designer Posts: 397	Re: Trouble to startup Colpitts Crystal Oscillator while easy with Pierce Reply #1 - Oct 20^th, 2009, 7:02pm Pierce version works well and easily start.
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neoflash Community Fellow Offline Mixed-Signal Designer Posts: 397	Re: Trouble to startup Colpitts Crystal Oscillator while easy with Pierce Reply #2 - Oct 20^th, 2009, 7:51pm I also tried to make Colpitts current / transistor size 10x larger. However, it still doesn't start up.
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