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80 Threads found on Spectrerf Pss
... I get a list of input sidebands and output sidebands. ... What are input sidebands? I think these are just back-computed input frequencies due to the output sidebands. At least I found a hint about this in the spectrerf Simulation Option User Guide: 113190
Hi, I use tsmc18 RF model to model my NMOS. The RF model of the NMOS itself is a sub-circuit. When I run pss with spectrerf, it showed warning for the NMOS: "M0: Missing bulk-source diode would be forward biased", but I actually tied bulk and source together and they are tied to ground. I run transient and probe the voltage of bulk and sou
You should do a pss analysis first to determine the frequency of oscillation then PNOISE to get Phase Noise at offset frequencies. But you should refer to spectrerf User Guide for more explains the pss+PNOISE analysis for oscillators in more detailed.
dear all i need your help,here is my question:i want to use PXF analysis of spectrerf simulator to evaluate the power noise effect on the phase noise of VCO output.but i cannot get the waveform. my pss setting is like this: .beat freq=400M //VCO output 426M .number of harmonics =10 .accuracy default: moderate .tstab=200n .
Not observing the suggestions for pss analysis of oscillators in the spectrerf manual?
Greetings Reader, I am simulating an amplifier (A simple one) The amp is merely a differential pair with a tail current source and resistive load. Differential Input Differential output. I placed 2 ports at the Gates of the Pair - each of them having first and second sinusoid amplitude set to pin in dBm and swept pin in a swept pss analysis
I have tried a simple circuit to check the harmonic. However, the harmonic is observed for the input port. I have no idea for explain this. Very appreciate for you any help. The following is the main flow in my work, (1) Schematic: Only one capacitor 10 pf, Port 1 is set sin source with 50 ohms res, freq=900MHz,Power=30 dBm, Port 2 is set as DC
I have a /4 divider ahead of the mixer. I wanna know how to set the simulation station in spectrerf environment. Use Qpss or pss? What's the value of fundamental frequency? Best thanks!
You can see this material:Simulating Switched-Capacitor Filters with spectrerf~I designed one 4th order switched capacitor biquad filter in UMC 180 nm technology using cadence software (version 5.10.41).This circuit is operating on a two phase non overlapping clock generator (i/p frequency = 1 kHz). To simulate this circui
I am trying to simulate a current-mode mixer which simply consists of quad switching pairs. At first I used isource at the input. But when I want simulate the mixer's distortion performances, e.g. IIP2, IIP3.. with spectrerf, I need to replace isource with power based PORTs. The problem is my circuit input is driven by current, and I need to fill i
Hello guys, Regarding phase noise simulation of oscillators: which tool (spectrerf - pss/PNOISE analysis or GoldenGate) provides the most accurate results? Is there any material comparing the performance of both tools? Mathematically: do they compute the phase noise in a different way? Thank you very much, Best regards,
Hello everyone, I encounter some boring warnings and errors listed as follows during pss simulation in Cadence spectrerf. Warning from spectre at time = 475.28 fs during periodic steady state analysis `sweeppss-014_pss', during Sweep analysis `sweeppss'. M0: Vgd has exceeded the oxide (...)
Hello, I am trying to run a pss analysis with spectrerf for a Ring Oscillator and at the end of simulation, while transient simulation is completed succesfull, I get the following message from pss: " Even after adjusting the tstab value, pss still failed to converge". Does anybody suggest a solution for this problem, Thnx
I have the following question: If I do iip3 simulation for an LNA and after choosing the output, the iip3 is -3dBm for example. If I choose the net of the input as the output for iip3 calculation, it will be -3dBm(ideally it should be infinity), Why does this happen ? I use pss followed by PAC for simulation. thanks in advance, Moham
Hello, everyone I have design a up-conversion mixer, IF=400MHz,LO=2600MHz and RF=2200MHz. I want to use pss+PAC to simulation mixer IIP3 follow "spectrerf User Guide", and find a question when set PAC simulation"Array of indices" Because I set fundamental tone of 200MHz, Lo at 2.6GHz, and two IF tones at 400MHz and
hi Also I have the above problem. Why there is not any newer version of "simulating switched-capacitor filters with spectrerf" document for spectrerf2008? In the above doc the netlist defines only the period and maxacfreq; while in specreRF there are so more parameters required, for example "Fundamental tones" and beat frequency simultaneusly. A
I read that for doing a pss analysis in spectrerf except clock other signals (including input) should be zero. now if I want to do at first a pss analysis and then based on its data do a PAC analysis for a circuit, what is the detailed procedure? please say each step in detail for spectrerf environment. For the above (...)
As I read in spectrerf (product version 5 2003) there isn't fundamental tones block for pss analysis and only one fundamental frequency is needed. But in spectrerf product version 6.2 (2007) there is a block with "fundamental tones" title and it is for pss. How is it possible to use more than one tones for (...)
Hi, all Somebody in this forum said that, the OTA with S/C CMFB simulation could be done by pss, PAC...., with spectrerf, but could anyone explain the detailed procedue or just give me some documents on that? I need it badly now! thanks a lot, and best regards Added after 5 hours 17 minutes: I tried t
I have problem for my oscillator. I use one oscillator to inject a clock which is running at 6G to another oscillator which is working at 3G as a divide-by-2 frequency divider. But pss dosn't converge. I don't know why because I can see the the function of divide-by-2 can be observed on time domain. I use spectrerf. I'm a new designer. Who ca