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Loop bandwidth (Read 1955 times)
raja.cedt
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Loop bandwidth
Dec 09th, 2008, 10:14pm  
hi,
    i have one question regarding loop bandwidth.i am designing a PLL whose fref=600Mhz.so i selected loop bandwidth 60MHZ for stability reasons.there are op amps in charge pump.so how to select op amp UGB's?
Thank you.
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SATurn
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Re: Loop bandwidth
Reply #1 - Dec 10th, 2008, 2:02pm  
Hello,

If this amplifier in the charge pump affects the loop transfer characteristics, then its bandwidth should be selected high enough to make sure that the phase margin of the PLL does not degrade.

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raja.cedt
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Re: Loop bandwidth
Reply #2 - Dec 11th, 2008, 12:30am  
hi,
   Thanks for your reply.i took 10 times than loop bandwidth.is it ok.
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