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26 Threads found on edaboard.com: Pll 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 (...)
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 (...)
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 (...)
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 (...)
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, (...)
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 (...)
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.
I have a new demodulator design. In order to assess the performance I want to simulate/ measure its BER. This is only a demodulator using a simple pll, no wireless involve. In this case, how to get the BER number from it? I mean either simulation or measurement. Thanks
There is a built in block called "DvdByN" in the "System-pll Components" library. You can use it to divide the output frequency in the feedback of pll...Also you can make the divide ratio a pulse by using "if" and "else" condition (on simulation time)if you are interested to see the transient behaviour of your (...)
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 (...)
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 (...)
pll low jitter 1 to 3GHz i donot know the frequency so my thinking is correct or not for you? 1 for cmos ic, use 2 inverters type osilator (in ads you can find as saple) i experienced to design colpitts type, unfortunately phase noise was huge because of Vdd and bulk noise 2 phase noiseepends on Hz/1V :: considering the (...)