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26 Threads found on Pll Ads
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 (...)
Even Falstad has a simple free pll simulation.
Hi All, I am using Xilinx Virtex7 FPGA for my design and tool using is xilinx Vivado. In my design there are signals which are driven by CLKA domain and going to CLKB domain and vice verse. But CLKB is twice the freq as CLKA and both are coming from same source pll. So whether I should give any constraints in this case?
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 ..@@
You need a dual modulus prescaler if you intend to cover a wide range of frequencies finely. If you are making a fixed frequency / fixed ratio pll, you don't need the dual modulus - you just need a modulus that is a factor of the divisor. And a large enough factor, that it makes the CMOS counters able to run at the remaining frequency without bei
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.
Hi , Which course would you take between pll and switch capacitor circuits ? Which one is most used in industry? or which one will be fetch me a job ?
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
hspice and spectre can simulate the pll system on transistor level ,though it is very slow but it is only a accurate method. Verilog-A only simulate pll on behavior level and be used in simple research or verification in advance. It puzzle the IC design engineer to simulate pll in sample and fast method. Regards!:D
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
hi i am currentlu doing a pll design in ads. I have done the same design in Microwave office and it worked. but the design in ads is giving some timestep errors. pls help.
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. (...)
hello all, I must design a low jitter monolithic pll in cmos technology but I donot know how to start? please help me ..