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26 Threads found on Ads Pll
Hi, I am attempting to simulate the pll phase noise in ads using the available pll blocks which I have implemented in transistor level in ads. However, the closed loop analysis in ads does not worked so I wanna do by adding the noise of each block to the s-domain pll model but I don't know (...)
The most popular reason for pll simulation failure is that you didn't set a sufficient small simulation timestep, e.g. 1 ps. This results in no pll operation without obvious errors. All other problems, e.g. missing libraries etc. gives significant warning messages like "component not bound" or errors. Regarding libraries, ads-ee has (...)
Cadence Spectre,Keysight ads,NI MWOffice,Ansys Nexxim,
Hi ads-ee, Thank you for your reply. I have grouped the CLKA and CLKB in the same group when I give asynchronous group constraints ("set_clock_group -asynchronous -group {CLKA CLKB} -group {CLKC}"). So my doubt is whether I am missing any other constraints between CLKA and CLKB domains.
Hi Everyone; Am new with ads and i wanted to make a pll, i tried a lot, really a lot, but i still can't get it working normally, i tried with the DesignGuide, and i can't fix my out Frequency to 5 Ghz. Can someone please help a little with the design of a simple pll in ads, or some document that could give me some (...)
there is a pll component option in pallete of ads. there u can find all the components like VCO and all for designing an pll..!! I couldn t figure out yet how to design a pll but u can get ur VCO block there ..@@
Can't you simply replace the VCO from the already available VCO divide-by-N block by your VCO? Sorry, I know neither the construction of this block nor the ads 2009 design system.
I use ads Envelope simulation to simulate a pll this is the schematic: 66373 (the VCO_dividedbyN is from the ads pll library) I scope the frequency value from freq port, it is OK. But I check the VCO spectrum, it seems to be wrong: 66375 the vtune is the VCO tunning voltage, the VCO_Freq_M
I'm trying to simulate the transient behaviour of a pll in ads, using the in-built pll behavioural components ("VCO", "PhaseFreqDetCP", etc.). I would like to simulate load pulling, i.e. how the VCO/pll will respond when the VCO load changes. Is this possible?No, impossible. I guess that,
In my opinion, ads is also very good starting point for system level pll simulations.All necessary blocks are including in its' libraries.
Dear All,,, I've simulated envelope in my pll design and got this error message. Anyone can tell me what is thi thx,,,
Hello guys,,, Could you help me please,,, I want to design pll for mobile wimax application,,, could u give me step by step instruction how to design this. tutorial and/ or papers would be preferable. And i've searching for logic gate and D fli-flop component in ads, but i've found nothing. can't we simulate dpll in (...)
Is the PFD_inoise in the attached pic. equal to the PFD leakage current ?? If not ,What does it mean ? (ads pll Design
I am making a pll PhaseNoise Response simulation with ads(Model from DesignGuide). Can any one kindly help me to explain the expressions in the data display window (Fig 1) ?? They are too complex to understand. Beacause some variables have not been defined in anywhere ~~ And I don't know the appropriate parameters to fill in Fig 2....[/
I use ads to simulate the pll phase noise response(sample of design guide). The synthesizer IC is ADF4111 which phase noise floor is -215 dBc/Hz. I don't know what number to asign to the variables pointing out in the schemetic ,as attached. And I can't get those data from ADI co.
Anyone knows pll tutorial for ads 2002? Thanks.
Dear Si r: I think ads is better. Becasue the pll , the trend is All-digital pll. and now the performance is good . The future pll will into All-digital pll.
You can try to simulate it in ads using the ptolomy with ENV method. Please be sure noise sources are included in your pll blocks.
Hi all Could anyone help me in modelling a frequency divider using ads? or knowing a block which already divide frequencies. N.B.: I wanna this thing for making a pll(PFD-CP) with square wave Reference input Regards
A few names that can do this job: Cadence Virtuoso, Microwave Office, ads. You can try Transient Analysis or Harmonic Balance (or both).
1. You can use transient simulation but if that takes too long...envelope simulation can also be used 2. Usually the components/parts are categorised in ads into blocks...e.g. System Mod/Demod, System pll components i would say that you use ur intuition to guess which part will be in which block...i am unaware of any way of searching fo
if you r using the transient analysis in ads......change the time step to a lower value. it will work. i had the same problem.
ANyone has tried to simulate pll with a vco subcircuit (not a VCO in pll omponent)? The vco subcircuit means the vco built from transistor in ads. Any example? In ads example, they always use VCO component from pll block.
Hi to all, I have designed a ring oscillator in ads and I simulate its phase noise using harmonic balance analysis. When I use the specific oscillator in a pll, with a divider, phase detector and filter, I want to simulate the resulting phase noise in its output. However this is not possible in ads using harmonic balance as far as I know. (...)
U can analyze the jitter by the phase noise. The ads and SpectrRF can hlpe you fininshing these things. It can provide you the lower bound of the jitter of ur circuit, because it olny calculate the device noise not including other noise which from power, reference and substrate noise. As the result, u should be careful about these items by yoursel