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Hello! Is it possible to simulate and plot a Closed Loop Transfer function in Cadence? I need to determine Jitter Peaking value of my pll. Thank you. -- Eugene
Hi all, I really got stock on doing phase noise simulation for a pll model made in MATLAB simulink ? DO you have any guides or tutorial ? Thank you. I appreciate.
I want to model a complete pll behaviourally and use MATLAB with an arbitrary VCO phase noise profile. My VCO has a known KVCO and a known Phase Noise at a 1MHz offset (say 130dbc/hz). I also know the VCO noise floor (say -140dbc/hz) and that it has a 1/f^3 dependence elsewhere. How would I model this VCO in MATLAB for a MATLAB/Simulink simu
The multiply idea sketched in post #1 is basically good, but it should be extended to I/Q demodulation to work over 0 to 360 degree. You can either generate a 90 delayed copy of one input signal, exact phase shift can be adjusted by a DLL. Or lock an all-digital pll to one signal. Both design variants should fit a smaller MAX10. Consider that t
Hello, I am planning to measure the phase noise of a VCO using pll technique using spectrum analyzer model # R&S FSL (9kHz - 3GHz). My question is what should i look for in the spectrum analyzer for measuring the phase noise. Do I need to plot the output of the LPF (connected at the output of the mixer) from 9kHz to, say, 100kHz? Then the re
Hi, I need to generate 4 Mhz clock from 2 MHz clock . I checked clocking wizard/MMCM/pll , but there input clock range start from 10 MHz. I had read about using rising and falling edge detectors but they fail to give 50% duty cycle. can DDS(direct digital synthesizer ) convert 2MHz clock frequency into 4MHz frequency?? what are the othe
Hi, I need to generate 4 Mhz clock from 2 MHz clock . I checked clocking wizard/MMCM/pll , but there input clock range start from 10 MHz. I had read about using rising and falling edge detectors but they fail to give 50% duty cycle. can DDS(direct digital synthesizer ) convert 2MHz clock frequency into 4MHz frequency?? what are the othe
A VCO has a transfer function of 100/s, could this mean, it produces frequency which is 100KHz/V? When the given expression is really the TRANFER FUNCTION (and not thefrequency with s=seconds), it must be interpreted as the PHASE characteristics. This is because in a linear pll model the input and output quantities
I don't recommend this, but the usual way is to use a pll. "Without any phase difference" is not possible --> give a useful tolerance value. pll is in fact the way to do, in a FPGA family with respective resources and performance. Time delay can be low enough to allow timing closure between CLK1 and CLK2 without extra sync logic
Try these
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Hi folks, I'm having trouble finding equations or literature on how to design a suitable frequency divider. Ignoring the sigma-delta stuff (for now), I want to know how to "hit" every channel in a fractional-N pll synth. Let's say I know the frequency step (channel spacing), reference (comparison) frequency and the VCO output range. I have
You might look for newer 18FxxKyy series that can achieve 64 MHz clock with internal oscillator and pll. They support 115k or even higher baud rates. Please consider that internal oscillator has limited accuracy and temperature drift, it can be also detuned by applying mechanical force to the PCB.
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Hello, I'm new to the forum but hopefully you guys will give me some great advice. I have been programming microcontrollers for the past five years, only as a hobby but I do plan to move to this as my career, I am currently a machinist but I don't quite have the means for university yet. I'm 27, so should still be capable of learning :razz:
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If you are able to use MatLab , you can replace pll blocks with their mathematicaly linear models.Otherwise Nonlinear elements won't give you any insight.
Hello all, 157237 I am having a problem I can't seem to diagnose: I have a pll centered around a ~24 GHz VCO. The block diagram is shown above, defiantly not the best design, open to criticism. The VCO provides a N/16 output which is mixed with a 1.
Hi guys, I designed a pll, and I'm not getting to a locking state yet. I'm trying to debug the problem by observing the behavior of different signals. It seems that I'm getting only Up Pulses and the behavior is periodic. here is one that simulation that shows the periodic behavior of Up pulses: 157210 [ATT