frequency synthesizer general questions
时间：04-08
整理：3721RD
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Hi all
When I was doing the frequency synthesizer dimensioning (N-fractional synthesizer) in system level design (WiMAX standard, 3.4-3.6GHz, 10MHz the channel bandwidth), I found some ambiguity regarding the reference frequency and the division period (T=Fref/channel space),
For example how can I choose the Fref?
I know that Nfrac=Fout/Fref, and I have to generate 20 frequency (Fout1=3.405GHz)
I wonna know if Fref can be a no integer number? Can I choose 200MHz (or more) as a value (quartz availability)?
The same question for T! When I compute T I found it a no integer number! Is it possible?
Many thanks in advance!
When I was doing the frequency synthesizer dimensioning (N-fractional synthesizer) in system level design (WiMAX standard, 3.4-3.6GHz, 10MHz the channel bandwidth), I found some ambiguity regarding the reference frequency and the division period (T=Fref/channel space),
For example how can I choose the Fref?
I know that Nfrac=Fout/Fref, and I have to generate 20 frequency (Fout1=3.405GHz)
I wonna know if Fref can be a no integer number? Can I choose 200MHz (or more) as a value (quartz availability)?
The same question for T! When I compute T I found it a no integer number! Is it possible?
Many thanks in advance!
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