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248 Threads found on Spectrerf
I have a problem in convergence of a circuit consists of an oscillator locked to the frequency of voltage source. I use tstab with enough values with no progress. My accuracy is "conservative". The waveform (of both steady stare and tstab) comes at the output , but non-convergence warning comes too! Have a look at the picture attached. [ATTA
I use spectrerf. the results that I showed is the result of transient analysis. what do you mean by steady state analysis please?
Hi, Going to use Cadence spectrerf to check DCDC buck converter AC characteristic (gain margin, phase margin, crossover frequency). Any reference? or Tutorial to use spectrerf for DCDC? I think I have to use PAC (periodic AC) analysis in spectrerf analysis setting but I have no idea how to create DCDC testbench and also set analysis (...)
Hi, I am using HB analysis in spectrerf to design a kind of mixer. To do effective HB analysis, I use Transient-Aided Option>Run transient>Decide Automatically. However, I can't find 'Decide Automatically' option as below. Please, let me know what's wrong. 114556
Hi You can find design workshop for mixer at spectrerf manual in MMSIM folder or just by clicking on "help" button in cadence virtuoso. In this workshop you'll find information about simulation key parameters of mixer/lna/vco.
... 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
Hello, If I do SP analysis in spectrerf for a frequency range, how can I get its equivalent series R,L,C and parallel R,L,C? Is there any suggested fundamental book I can refer? Many thanks.:razz:
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.
in Cadence spectrerf, is there coupler model? or behavior model? how about bi-directional coupler model? if there does, please tell me where to find that! thanks!
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 .
Hi, I am trying to simulate RF power amplifier using Cadence. There is a guide file entitled "spectrerf Workshop Power Amplifier Design Using spectrerf MMSIM61". I want to follow the tutorial but the problem is that there is only block diagrams not detailed schematic. Could anyone tell me where can I find the detailed schematic for RF power ampli
How to generate a ramp voltage in Cadence spectrerf (or AMS)? I am designing a compartor and need to give a ramp voltage at one of its inputs, the other input being a dc voltage. Can anyone suggest me ideas to generate a ramp voltage. Thank you.
Not observing the suggestions for PSS analysis of oscillators in the spectrerf manual?
Greetings everyone, I'm trying to simulate a power amplifier and find the load-pull contours. I've done the state setup and the design set up as the spectrerf manual says. The thing is, spectre can't seem to understand the portAdapter symbol. When trying to simulate the design, I get an error as shown in the picture below. The parameters that ar
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
There are 3 frequencies in my circuit: frf = 1955MHz, LO1 = 1960MHz, and LO2 = 1950MHz. I'm setting up a 2-tone HB analysis: hb hb oversample = fundfreqs= maxharms = When the simulation runs, it keeps telling me: ERROR (SPCRTRF-15268): The source V63 couldn't find matched freq. Please make sure the fundfreqs
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
What is the best option to create user-defined models for use in circuit design using Cadence Analog Design Environment/spectrerf?
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!