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peculiar vco phase noise (Read 2792 times)

mixed_signal Senior Member Offline Posts: 183	peculiar vco phase noise Oct 18^th, 2013, 7:49pm Hi, The phase noise of my vco looks weird with a peaking near the center. The vco is followed by a Power amplifier �followed by offchip matching network. I have control �on the matching network components. Is it parasitic oscillation? How can I fix this? Any materials that discuss solving such issue?
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raja.cedt Senior Fellow Offline Posts: 1516 Germany	Re: peculiar vco phase noise Reply #1 - Oct 20^th, 2013, 5:40am Hello, I haven't seen this kind of results till now, very strange for me. Could be some spur from supply noise or may be bandwidth was too low, which is giving huge peaking. � What is your Bandwidth and reference frequency? Thanks, Raj.
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mixed_signal Senior Member Offline Posts: 183	Re: peculiar vco phase noise Reply #2 - Oct 20^th, 2013, 10:27am Hi Raja, I forgot to mention that this is an injection locked oscillator locking to the third harmonic of 800 MHz i.e. 2.4GHz. But I heard some saying about parasitic oscillation
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tm123 Community Member Offline Posts: 67 Chicago, IL	Re: peculiar vco phase noise Reply #3 - Oct 21^st, 2013, 12:36pm Does your design use a switching power supply? Looks to me there is a spur at ~3KHz, although the magnitude is not too large. If your oscillator has poor 'pushing' you can get a spur from power supply ripple.
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