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*******VCO DEMO****************** .option POST .tran .01n 100n ***********************vco_define*************** Evco nco 0 vol='0+1.8*sin(6.28*1e9*V(vctrl)*time)' Vcontrol vctrl 0 pwl (0 0 100n .1) R1 nco 0 10meg **************** Harmonic Balance Test Bench**** .HBOSC tones=150meg nharms=
Hello my name is Alberto , I would like to design a RF amplifier with transistor BFR 540, I attached a scheme that I have to see if someone know about Genesys or other simulation program can help me in designing the project, if is possible 2 or 3 stages BFR 540, if anyone is interested in doing this project and the need the bjt BFR 540 can send bec
i am using orcad pspice 9.2 ***** it is showing error while simulation the model/circuit please help where do i get library files the error message is ERROR -- Can't find library .tran 0 0.02 0 1e-8 .OPTIONS STEPGMIN .OPTIONS PREORDER .OPTIONS ABSTOL= 1.0e-4 .OPTIONS VNTOL= 1.0m .PROBE V(*) I(*) W(*) D(*) noise(*) .INC ".\1
Hai, I am simulating active inductor VCO with free running frequency of 5GHz in 65nm technology. 111313 using transient analysis (enabled transient noise) the measurement of period jitter is 400ps In tran analysis the noise setttings, noiseseed 1, (...)
hai, help me in finding flicker noise frequency for calculating phase noise for LC VCO also how to calculate current at particular node using T-spice i tried using probe command it shows as \only_varactor_with_DGFET_20131204_153404.tsim but i did not find the voltage in manual they mentioned as .probe tran Saves all node voltages (...)
Dear all, anyones whos knows how to distribute a tran noise simulation jobs on different cpus? How to distribute the intial seed? thx.
Hello, I am writing a program to calculate the noise contributions of various PLL components (VCO, Charge Pump, etc.) to the output. The PLL is a FracN and it uses a P/(P+1) prescaler and a delta-sigma modulator. I can simulate the noise output of the prescaler in the circuit simulator. My question: In order to *approximate* its noise (...)
The common mode centre tap is provided for many reasons. 1) reduce common mode stray noise with a low common mode impedance point 2) improve common mode rejection ratio for EMC reasons of ingress and egress. 3) isolation of grounds from local source to transmission line to reject stray lightning E-fields and other high interference 4) (...)
Hi, After designing an amplifier in spice, which type of analysis/tests should you run? I know that it is normal to start out with an classical AC analysis. Then one might do an tran analysis where a sawtooth/step is inserted to your input. But then what?:)
A modulated analogue CATV signal/multiple signals or simply TV signal can be transmitted over a distance by UpConverting with a appropriate Oscillator and Mixer. In UpConverting, the most important issue is noise, especially high Phase noise will create some noise coloured spots on the image.
I designed a 2-1 sigma-delta modulator and found fft issue I don't understand. My sim has 2 steps: 1) run "tran" analysis in spectre (select "transient noise" option) 2) read data from modulator output to matlab and do fft in matlab I used 2 different sampling capacitors (1pF, 4pF) for the first integrator and other parameter (fclk, (...)
A bipolar transister circuit would usually have an input impedance less than 40Kohms. No, it wouldn't. Only a basic common emitter circuit would. But there is a world of transistor circuits beyond it. Before high performance audio OPs appeared, no one used an OP for a low-noise preamp. They have been build from bipolar (...)
Hi guys I'm now designing a on-chip balun. two methods may be adopted. First, get sp. file from momentum simulation,and use this sp.file to embedded in the rest of circuit do the full simulation such as dc ac noise tran pss ect. Second, to model RLCK use it to simulate instead balun. what puzzled me is: can sp.file accurately do the time-doma
Hi, all As we know, we can predict VCO phase noise using hajimiri's LTV model. And I have read his papers, where he defined a useful function called ISF to calculate phase noise. But I still don't know how to get the ISF from simulation. Do you obtain it by PSS or by tran simulation? As I know, the same VCO may start up at different (...)
I believe Cadence can do transient noise analysis. Right. In the ADE (Analog Design Environment) menu, select Analyses -> Choose... In the Choosing Analyses menu, if you select the (default) tran analysis, you may also select transient noise, which extends the menu for special n
Pls, I need matlab codes to implement multiple (noise) attenuation in seismic data using slant stack filtering, tau-p transform and deconvolution. Any help on any of the codes is highly appreciated. Thanks
I mean how many microseconds of simulation time! If you want to see 1/f, you need to run quite a long time... By the way, are you running transient noise?? If not, you will not see any noise at all!
Hi All, I heard Cadence's spectre has a new feature supporting transient noise analysis. But I cannot see the options such as noisefmax and noiseseed in tran analysis setup of my spectre. The version of my virtuoso ADE is Do I need to update to any newer version? Or is there any (...)
Hi, I am designing a sigma-delta pll, and want to do the phase-noise simulation with spectre PSS and Pnoise. But there are some questions about it, and can anyone help to solve them, please. 1. when I use a OSC verilog-A code as the input reference frequency source, the PSS simulation will be failed because of the hidden-state in the verilog-A
I think use .tran is more suitable for switching action.
If you know how to run tran or dc analysis,you could could pz analysis and noise analysis to do pole/zero analysis and noise analysis respectively.The output and input referred noise could be found in main from Results??print------noise summary.
you can simulate the open loop ac gain of the delay cell chain, and find wether it is large enough for start-up. a simpler method is set the running step of tran small enough--less 1/10 period, and the noise of the numerical computation in simulator will make it oscillate. this noise is usually much less then the physical (...)
I was trying to simulate an negative transconductance oscillator using active inductor in spectre in .18u technology.but i was not getting any active inductor is basic gyrator C topology.when i tried to do tran analysis i was getting exponentially rising curve.. can any one please help me Is phase noise respons of oscillator using
HI all i am simulation a pipeline adc. I give a sine input, and do .tran simulation in hspice. Then catch the 10-bit digital code to do fft in matlab. Then i want to know, the fft results can give the SNR results? And is the noise compont included in the tran simulation results? What performance of adc can get from the fft (...)
Hello, hr_rezaee I did simulations with two files you provided but did not get same plot. The following two netlists are my control signals and analysis. Can you show me how to fix the problem? Thanks 1. .noise V(OUTD) VID 10 .PRINT noise Onoise Inoise DB(Onoise) DB(Inoise) (...)
schmitt triggers are used when the input is noisy.... i.e. the input may cause multiple transitions if given to a ordinary comparator...
tran. simulation, then fft
I use pss+pnoise to do VCO simulation. I set the beat frequency at the oscillating frequency from tran simulation. When I change the beat frequency to the frequency from PSS, the phase noise change worse. So which should be the right beat frequency and right phase noise? Thanks!
i have this 10-bit pipeline ADC that operates at 6.75Mhz, i wanna test INL & DNL factor for my ADC, i knew it supposed to be done using transient analyses...what type of input i should give, i've differential input in to ADC. ANd how long u need run & how many hours does it takes???
you can reference the theory about pll, and write the tran. function, you will get the anwser
In ELDO you can use .noisetran
hello all: i use @DS to simulate vco phase noise, but the simulator gives a warning and no results can be obtained.(the vco config is showed in the attached pic). the vco can work normally under tran simulation,the warning information seems so strange. can some one give some suggestion. thanks gargoyle Simulation / Synthesis (...)
hello all: i use ads to simulate vco phase noise, but the simulator gives a warning and no results can be obtained.(the vco config is showed in the attached pic). the vco can work normally under tran simulation,the warning information seems so strange. can some one give some suggestion. thanks (...)
hi Some question about noise, I get noise around 100nv/hz in AC analysis, but the problem is how can i apply this info in transient simulation? Thanks. Suria
to calculate the long term jitter.u can follow this.just run the tran simulation for about say 10us.(iam simulating a 50Mhz pll).then in cadence go to results browser from the analog environment.then right click on the vco output(the net whose jitter we need to calculate) and click calculator.after opening the calculator ,calculate the frequency an
It is most probably not. The noise introduced by the finite arithmetic and the random errors in calculating the time domain values are more than the noise of the transistors.
There are two classical methods to reduce this problem. The first is to put a baffle around the receiver so only light from the direction of the transmitter shines on it. The other is more complex. Use a modulated carrier method so there are no spectral components at the lower frequencies. Then use high pass amplifiers so that signals at the po
if no KF parameter in mode model .. how to simulation noise in .tran simulation ... as I know KF only effect freq domain simulation .. thank you