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Ring oscillator Phase noise (Read 2475 times)
raja.cedt
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Ring oscillator Phase noise
May 04th, 2010, 7:40am  
hi,
  i have designed a ring oscillator for 2.4g, i got phase noise around 98dbc/hz..i found major contribution from V to I converter? is it my observation correct if so could you please explain reason or  please direct me towards good reference

Thanks,
Rajasekhar.
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Re: Ring oscillator Phase noise
Reply #1 - May 4th, 2010, 7:07pm  
It will be one of many contributors.

What's your circuit architecture?
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raja.cedt
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Re: Ring oscillator Phase noise
Reply #2 - May 4th, 2010, 8:03pm  
hi,
 the delay cell has been used here is current steering  based inverters, so in this i found  V to I is major....

Thanks,
Rajasekhar.

                 
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love_analog
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Re: Ring oscillator Phase noise
Reply #3 - May 5th, 2010, 12:37pm  
If you can upload a schematic that is better.

Remember in LC VCO, the bias current is a major contributor. We put RC filter to remove the bias current contribution.

So what you are seeing is not unreasonable, provided we understand your schematics better.
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