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how to measure kpd for a phase detector in a PLL?
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akula1488



Joined: 12 Dec 2007
Posts: 4
Post01 Jun 2008 5:13   

how to measure kpd for a phase detector in a PLL?
I am quite new to hspice..any help is appreciated
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Post01 Jun 2008 5:13   

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FvM



Joined: 22 Jan 2008
Posts: 5160
Helped: 767
Location: Bochum, Germany
Post01 Jun 2008 6:59   

Re: how to measure kpd for a phase detector in a PLL?
Provided the phase detector has a finite phase gain (a digital detector may have infinite gain) you can supply two signals with a small frequency difference to the detector circuit in transient analysis (a constant slope dφ/dt ramp). The slope of output signal divided by dφ/dt gives kpd.
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LvW



Joined: 07 May 2008
Posts: 1466
Helped: 242
Location: Germany
Post01 Jun 2008 10:23   

Re: how to measure kpd for a phase detector in a PLL?
Which kind of phase detector are you using ? (mixer, exor, JK-FF, charge pump) ?
In any case, I would propose to use one single signal source for both channels and some kind of filtering (low pass or better: allpass) in order to create a controlled phase deviation in one signal path. Then, the PD output voltage divided by the phase difference gives the PD constant.
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akula1488



Joined: 12 Dec 2007
Posts: 4
Post02 Jun 2008 0:35   

Re: how to measure kpd for a phase detector in a PLL?
thanks for the help.
I am using Hogge's linear phase detector for CDR. so I will need a charge pump as well.
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