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Convergence problem in LPTV circuit (Switched capacitor circuit)
Hi, hope all you guys be fine during this covid time! I am dealing with PSS/PSP simulation on the LPTV circuit, the circuit works out at 1 GHz for my first running. However, when changing it slightly...
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RF SPDT gives an error: Factorization of matrix failed due to non-finite...
Hello,We are trying to see how many parallel capacitors might be needed to get the pF we need, but we are getting this error:The schematic looks like this. Basically when C2>0 or C3>0 it should...
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Subcircuit string parameters will not pass to a SUBCKT NET=, but works with...
Hello,I'm trying to pass the name of an s2p Data File into a subcircuit parameter so I can have a subcircuit with a big template but change the s2p being used in that subcircuit by variable name.It...
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Concatenated vectors of strings are truncated when the circuit is being...
This is a very strange bug: If I create two parameters to a subcircuit, one a vector of strings and the other a vector of integers and then call concat() in the subcircuit, then it works properly on...
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Error When trying to Import the subcircuit Spice model into Cadence
Hi, Hope you are doing fine. I have read the forum and the post Tawna made here:...
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Problem Simulating Noise Figure of Gm Cell (single Ended)
Hi,I was trying to simulate the NF of simple Inverter (Which I will use as a gm-cell at the output of my switch-cap passive mixer). Unfortunately I am getting NF=46.48 dB for my circuit.I have attached...
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Problem of Nport PSS shooting simulation
Hello,I have some problem when doing the PSS/PAC/PSP simulation with Nport from the analoglib.I'm using Spectre Version 19.1.0.373.isr7 64bit and Virtuoso IC6.1.8-64b.I wrote a S4P touchstone file to...
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conversion of a schematic to a touchstone file
Hello , I am a beginner using AWR Cadence and I would like to ask you if it is possible to convert a 2-port schematic into an S2P file using AWR Cadence..Thank you i advance for your help .Ameny
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ISF Function from PPV & plotting various PPVs
Hi I am new to Cadence environment. And trying to plot ISF in Cadence. Firstly, is there any paper that describes the relationship between them? Because the ones I found are mathematically rigorous and...
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Generating a pulse signal with specific duty cycle using AWR Cadence
Hello everyone,Is it possible to generate a pulse signal with a specific duty cycle and with fixing th number of the pulses using AWR Cadence ? I searched in the previous questins in the Forum and...
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Question about DC convergence error in sweep simulation.
Hello, thank you in advance for your assistance.I was making simple op-amp, but I used verilog-a based mosfet model (MIT-VS model).To see DC operating point, I did DC simulation, and it seemed like the...
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limited OS parameters problem for creating ft formula
Hello,after plotting gm_id vs Vgs ,wen i tried to get another parameter it shows me a list of one parameter as shown bellow.Where did i go wrong?Thanks
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HB AC warnings: Solver did not converge to the desired tolerance of 0.0001
I have been getting the following errors in my HB AC simulations. Would like to get some feedback on how to solve this.Warning: Solver did not converge to the desired tolerance of 0.0001. It converged...
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expression vs OS param problem
Hello,I have tried to build an expression of ft vs gm as shown bellow,by defining on side by name then i have did wavevswave in calcularor.It shows me the error shown in the end.Where did i go...
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problem using design variable in calculator
Hello, i am trying to build Id/W vs gm_id expression ,the design variables are shown bellow.When i pressed the VAR button and the schematics pops up,i press the NMOS,and no list of L,W pops up,it stays...
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Trying Analyst extraction in MWO for the first time, getting errors...
Hello,I'm trying out Analyst for EM extractions instead of AXIEM but I cant get the Analyst extraction to work (though AXIEM does). The EM has no metal after extraction and I get errors like...
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Plotting Phase Noise for Injection Locked Ring Oscillator
Hi, I am using spectre -W( subversion 15.0.1.257) virtuoso -W(subversion IC6.1.7-64b.500.10). And I am trying to plot the Phase Noise for the Injection Locked Ring Oscillator for the Schematic...
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Variable for noisefile in vsource
Because I want to sweep noise profile of a dc source in Assembler, I put a variable (f_vctrl) for the noise file name and use something like "path1","path2" in the corner settings.But then the...
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I cant find PACmag in cadence
Hi guys. I have a really silly question. I'm using cadence IC617 and I can't find the location in which to set up PAC magnitude for PAC analysis. I tried PORT and Vsource but the only thing that is...
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Passivity violation in S param file
Hi everybody, I am designing LNA whose testbench uses some S-parameter files for off-chip components from vendors(L,C, balun...). the warning arises as in the logfile below I think that it is due to...
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