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Old 5th January 2005, 12:37 PM   #1
borges is offline borges  Norway
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Default oscillator troubles

I'm moving my oscillator from the CD drive to my DAC board. Signals go via I2S. This works really well, but the question is: what oscillator circuit should I build? Should I pick the easy way, buying a simple canned oscillator, hook up a crystal and a chip that pulls it all the way from 10kHz to 10MHz, or go all out with a Colpitts (or friends) that I build from discrete transistors. As always, low jitter is the ultimate goal.

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Old 5th January 2005, 01:35 PM   #2
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there are so many high speed comparators out there that it seems pointless to build it from scratch -- check out Analog Devices website.
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Old 16th January 2005, 12:37 PM   #3
EC8010 is offline EC8010  United Kingdom
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A sinusoidal crystal oscillator will have lower jitter because it doesn't overdrive the crystal, so a Colpitts would be fine.You want to maximise the Q of the resonant circuit, so the crystal should ideally see a low impedance at each end. The oscillator needs to be buffered before feeding the comparator. If you don't include a good buffer, the sudden changes in input impedance of the comparator as it switches will upset the oscillator. Current feedback video op-amps such as EL2030 and derivatives are useful here.
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