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Modelling noise in a DC current source
Hi,I would like to know how to model noise in a DC current source. I want to model reference current RMS output noise which is taken from the practical current source datasheet. I would like to know...
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Injection lock vco
Hi all,Is there any guide that helps me simulate an injection locked vco ?All I know for now is: run a transient simulation and let my oscillator reach the steady state and then I use a switch to...
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port calibration in EMX
Dear RF experts,I have a few questions about EMX:- In the EMX documents, port calibration is not mentioned anywhere. Could you tell if EMX is capable of doing this, or the calibration is already...
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identification of diode and monolithic amplifier
hi, I need to identify the components in the circuit. Its noise source, old and from china. In left corner it must be zener diode, next to it monolithic amplifiers. If you have experience with these,...
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Why don't PAE vs PT (Total Power) measurements agree?
Hello,I'm tuning an NXP LDMOS FET model in Microwave Office. When my Vds current is about 20A at 12V, my output power on port 2 measured by the "PT" Total Power measurement shows ~100W (which is our...
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Transient Assisted Harmonic Balance
I am designing a 3-port circulator circuit that mixes an RF input with a local oscillator. The oscillator is custom design and not a ideal source. I have tried hb simulation with the oscillator...
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Large signal sp analysis in virtuoso
How is it possible to perform a large signal analysis for a varactor? I have used lssp from hb analysis but it isn't give results for a varactor.Thanks!
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Usage of PN() after transient noise simulation
In this document: Virtuoso Spectre Transient Noise AnalysisThe PN() function is used to calculate the phase noise after transient simulation with this equation: (p.55)What's the reason for the last...
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Strange transient behavior of an LC-oscillator
Hi, I’m trying to do transient simulation for my LC-oscillator, intended for ~260GHz. I first em-simulated the inductor and interconnects using EMX to extract an S-parameter data file and then embeded...
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Interstage matching in Cadence Virtuoso
Hello,I am trying to create a multistage amplifier operating around 200 GHz in Cadence Virtuoso. Could someone tell me how I can measure the impedances at intermediate nodes? I need this so that I can...
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multiple S-parameter Simulation touchstone save
HiI want to do an S-parameter simulation and sweep a design variable in ADE XL setup and save each S-parameter results in a separated touchstone fileBut when I give an address in Output Parameter...
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bbspice fitting process taking too much time
Hi,I have an S parameter file generated by EMX for my oscillator. It has 56 ports and was simulated from DC-900GHz with a 1GHz step. When I used bbspice as the interpolation method for the nport, the...
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Unable to run cds_srr commands in matlab
Here is my simple matlab script:import cadence.srrdata.*import cadence.Query.*import cadence.utils.*resdir = '/nfs/sc/disks/xyz_dts_tb/maestro/results/maestro/Interactive.47/1/xyz_noise/psf';datasets =...
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VCO verilog-A model not running pss
Dear all,I am running a pss of a simple VCO verilog-A model, but there is an error found and pss is failed:Warning from spectre. WARNING (SPECTRE-16707): Only tran supports psfxl format, result of...
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Internally Connected Pins on Cell Layouts are Not Working
We created a cell footprint for a shield inductor for my HF radio project. The shield has multiple pins, so we assigned all of those pins as cell port 3. When we connect to one of the shield cell...
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ISF Simulation using Transient Analysis by injecting Impulse
Hi ,I am trying to get the Impulse Sensitivity function for Ring Oscillator so I am trying to follow the below steps:i) First I am simulating the oscillator unperturbed and get the unperturbed...
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Phase response of injection locked ring oscillator
Hi,I have designed a first harmonic injection locked quadrature oscillator (First harmonic means - input and output are at the same frequency. It is not a divider). It accepts a differential input...
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Phase noise and jitter simulation
I have a clocking circuit containing 2 stages, a buffer followed by a divider. I used pss with shooting method +pnoise to simultate the Rj. Assume that the clock frequency is fin at the input of the...
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Harmonic Balance Convergence Issue
HiI'm running hb and hbnoise to plot the phase noise of a clock divider that divides a 4.5-GHz clock by 10, but the simulation doesn't converge.I configured the oversample factor to 8 (and tried 16) as...
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