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47 Threads found on edaboard.com: Phase Detector For Pll
I am looking for a design to implement phase locked DRO or PLDRO. During literature survey, I find the only way to implement this is by using a SRD comb generator and a phase detector to phase lock the Vt-DRO,it requires a sweep circuit too(sampling phase locked (...)
TSA5512 don't have an internal VCO, and needs an external one. The external VCO is controlled by the phase detector (PD output of the chip). The 4MHz internal oscillator is the Reference oscillator.
The low input impedance will affect the pll loop gain, but the minimal phase detector output current of 100 ?A should still give full output swing. Are you sure that the VXCO has the same frequency and control voltage range? You can add a voltage buffer after the loop filter and check if it changes the behavior.
I can't follow equation 4 either. How about this paper, which describes a better equation and better 3 phase over-sampling detector.
Hi, This question is about digital pll design. I post my question here because I do not find another appropriate forum on digital pll. The Dpll is in fact a software pll according to some pll's definition. It calculates the phase error with hardware. This (...)
Is there any relation between delay and blind zone in phase frequency detector? can we decrease the dead zone or blind zone by decreasing the delay of the overall circuit for phase frequecy detector?
use a mixer as a phase detector (u need on with a DC coupled IF output). Line length L2 is much longer than L1, so it forms a delay line frequency discriminator. You might need to trim L2 or L1 slightly to get the mixer into quadrature. Drive the power splitter with >14 dBm. The oscilloscope shows the voltage out of the mixer, which (...)
I think, you can answer the question yourself by looking at slope of the transfer characteristic of the phase detector and assume different start phases for the lock process. I don't have the book, but the answer sounds very visual.
YOu can use a type II phase freq detector for this with a VCO. and /N counter but VCO must be variable from 100 to 500Hz with a loop filter around 1Hz. This wont work very well as the mixer frequency is too close to the loop filter BW and so even with S&H and integrators, it will still be noisy. But if your goal is to improve stability (...)
You can use one of several types of phase detector. They are used, for example, in pll's. One of the simplest is to limit the signals (assuming they are "clean") in order to obtain square waves and apply them to an EXOR gate. Regards Z
Hi all I am writing matlab code for pll component. Below is my code: function = pllcom(ipump,vco_gain,fref,fout,bandwidth,phase_margin) Kpd = ipump/2/pi; % phase detector gain Kvco = vco_gain*2*pi; % vco gain omega = 2*pi* bandwidth; % open loop bandwidth in radians/sec N = (...)
iam looking for analog pll matlab code. i have written code for phase detector and filter, could anyone tell me how to write the vco code in pll,, and how to integrate the whole pll..
The phase detector is usually actually a phase/frequency detector. It has the capability to determine if the frequency of the VCO is higher or lower than the input reference frequency. It also, once they are at the same frequency, to output a voltage proportional (+/-) to the phase difference between the (...)
Hello all, Can someone help me with implementation of PFD, not by CMOS, rather than by CML (current mode logic) or ECL (emitter coupled logic)? This PFD will be used in pll. all I've seen was designs using 2 DFF's, but all were designed for CMOS... Thank you
Better check the PFD (phase-Frequency-detector), which accepts reference clock as its input, in the pll to see if it uses sine wave or TTL/CMOS square wave.
Hi All, I am new to the analog/RF IC design. I am desiging the phase frequency detector for pll. I need to design a D flip flop for the phase frequency detector. Could someone please provide me a simple CMOS D flip flop circuit to start with ? Thanks in advance.
It is output of phase detector, i think. Btw, what do you meant by "I did not use any fitler"
for FM demodulation: If modulation index is low (max. phase deviation less than 1 radian), you could use a narrow-band pll as a phase demodulator. The output is the ouput of the phase detector, that after derivation gives the frequency. This can work for low-index FM but (...)
Only to the extent that the loop is responsible for the spurs. From fluttering about the edges, I see some components of phase noise that are internally generated (esp. supply rail activity and phase detector signal risetimes, these create small jitters and close-in phase noise that the loop can only (...)
Most pll literatures seems to spend a great deal on the behavioral level analysis to determine best behavioral level parameters, for example, Kvco for VCO gain, Kpd for phase detector gain, etc., but say very little about the connections between behavioral level parameters and the ckt level (...)