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› how to determine loop bandwidth for PI with digital filter?
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how to determine loop bandwidth for PI with digital filter? (Read 7166 times)
supermoment
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how to determine loop bandwidth for PI with digital filter?
Apr 12
th
, 2011, 8:15am
how to determine loop bandwidth for PI with digital filter?
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raja.cedt
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Re: how to determine loop bandwidth for PI with digital filter?
Reply #1 -
Apr 12
th
, 2011, 9:01am
what do you mean by PI loop BW..its an open loop system
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supermoment
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Re: how to determine loop bandwidth for PI with digital filter?
Reply #2 -
Apr 12
th
, 2011, 5:12pm
PI output go to a CDR loop
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raja.cedt
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Re: how to determine loop bandwidth for PI with digital filter?
Reply #3 -
Apr 12
th
, 2011, 9:35pm
yes,
so should ask CDR bandwidth riteee....
so this is a different question now. Tell me weather your CDR is 1st order or 2nd order from there we can decide.
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supermoment
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Re: how to determine loop bandwidth for PI with digital filter?
Reply #4 -
Apr 13
th
, 2011, 1:12am
since PI replacing the vco, there is no 1/s integral part. Then it should be 1st order.
digital loop filter is used.
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raja.cedt
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Re: how to determine loop bandwidth for PI with digital filter?
Reply #5 -
Apr 13
th
, 2011, 5:02am
correct but what about loop filter. General rule is if you need only phase tracking use first order, but if any frequency tracking required (like systems which are having ppm between TX and RX) then 2nd order imp.
Thanks.
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supermoment
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Re: how to determine loop bandwidth for PI with digital filter?
Reply #6 -
Apr 13
th
, 2011, 5:55am
how to determine the loop filter?
input does not have ssc.
could you point me some of the good papers?
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raja.cedt
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Re: how to determine loop bandwidth for PI with digital filter?
Reply #7 -
Apr 14
th
, 2011, 10:12pm
hi,
http://www.ece.tamu.edu/~spalermo/ecen689/cdr_hlee_stanford_2006.pdf
http://www.ece.tamu.edu/~spalermo/ecen689/dig_cdr_bb_pll_sonntag_jssc_2006.pdf
Thanks.
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supermoment
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Re: how to determine loop bandwidth for PI with digital filter?
Reply #8 -
Apr 14
th
, 2011, 11:25pm
thank you
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supermoment
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Re: how to determine loop bandwidth for PI with digital filter?
Reply #9 -
Apr 24
th
, 2011, 7:28am
how could the PI has 2nd order loop??
2nd order loop implies that the PI can adjust its clock frequency. The PI has only fixed frequency but the phase can be adjusted.
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raja.cedt
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Re: how to determine loop bandwidth for PI with digital filter?
Reply #10 -
Apr 24
th
, 2011, 12:36pm
good question, i also understand little bit. So please refer the above thesis. What i feel is rate of change of phase is frequency. If you know any answer for this let me know
Thanks.
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supermoment
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Re: how to determine loop bandwidth for PI with digital filter?
Reply #11 -
May 12
th
, 2011, 6:09am
got it.
freq=d(phi)/dt (1st order)
ramping freq = d(phi)^2/dt^2 (2nd order)
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