Very low noise 1MHz sine wave oscillator

[thatsthebadger]

I need to design a sine wave oscillator of around 1MHz which needs to have very low amplitude noise, since it is used to lift a signal off a capacitive sensor - the sensor AM modules the sine wave and is later demodulated.

There seem to be a number of possible approaches for this circuit - perhaps Wein-bridge, phase shift or a relaxation oscillator followed by filter.

I would be very grateful for any suggestions as to which approach would be most suitable for a modulating carrier with very low amplitude noise?

 

[thannara123]

you can use maxima Ic for this problem
search maxima site

 

[thatsthebadger]

Though I would update this with my findings. Some useful references are this long application note from LT:

http://cds.linear.com/docs/Application Note/an43f.pdf

And this short random one I found:

http://www.discovercircuits.com/Andy/WienBridgeOscillator1.pdf

Wien seems a good way to go, although the aplitude stabilisation is a bit clunky - no one would want to use a lamp these days I guess!

Still looking for the best solution!