Clik here to view.
Problems with transistor operation point info in transient analysis
I want to look at transistor operating points during a transient simulation. So I used "*:oppoint" in the save statement. The plot below shows a transistor's vds, vgs, drain and gate...
View ArticleClik here to view.
Using ipwlf with a file input
Hello,I am using virtuoso 6.1.9 release. I was looking for documentation for how to include a file in an ipwlf instance on the support site but was unable to find one. I am looking to add the current...
View ArticleClik here to view.
Differential impedance vs single line impedance
Good day everyone! So, recently I've been tasked to design a small board with a differential pair connection. The problem is that diff pair calculator shows me that while the differential impedance is...
View ArticleClik here to view.
DC Convergence Problem When Simulating a Post-Layout r_c and r_c_cc Extraction
Hi All,I'm simulating a post layout r_c and r_c_cc extraction of a transmitter circuit for transient simulation using config view, The problem is when simulation starts it checks for the "Trying...
View ArticleClik here to view.
How to execute an Ocean command from a string
Hi, I would like to generate a command as a string, perhaps based on local variables or something, and then run it in Ocean _as if_ I typed the contents of the string at an Ocean prompt. If I denote...
View ArticleClik here to view.
Modifying BSIM-IMG model and using it in Cadence
Hi,I'm trying to modify BSIM-IMG model from Berkley http://bsim.berkeley.edu/models/bsimimg/ for my application (I'm trying to modify the temperature related formulas for Cryo application). I have made...
View ArticleClik here to view.
How to measure the capacitance of the NMOS used as a varactor
Hi All,I am using the circuit shown below. IÂ want to have a tuning range of 2-4 GHz for LC VCO. I want to use the varactor in this configuration.My question:1) How can I find the capacitance of the...
View ArticleClik here to view.
Difference between OCEAN and MDL
Hello,I was wondering what is the advantage of using MDL over OCEAN ? In my limited knowledge, OCEAN is a super-set and can be used to perform a wider variety of tasks as compared to MDL. Am I missing...
View ArticleClik here to view.
Function to add scs file to model libraries
HI all.I am using IC6.1.8-64b.500.10I am checking, but with no success so far.Is there public function to add scs file to model libraries programmatically so it can be shown here: or here Thank you in...
View ArticleClik here to view.
Reset layout celview size
Hi,Sometime happens that we set some field of a pcell in meters, after a while we can return to edit the cellview to fix the wrong value, but something in the cellview changes and it seems that the...
View ArticleClik here to view.
Calculating Internal Power in Liberty File
Hello,I have created a liberty file (.lib) of standard cells using a device model and netlist in SPICE format by Cadence Liberate. Now, I want to verify my cell characteristics in the ".lib" file by...
View ArticleClik here to view.
Monte carlo sampling: range of design variable
Hello everyone,I have two design variables(amp,pw) that have special ranges. Amp is [0.05,0.8], pw is [10p,1n], and I want to sweep these two variables use monte carlo in adexl instead of normal sweep...
View ArticleClik here to view.
Spectre Transient Noise Simulation (Transistor sources, analytical behaviour)
Hello,I am running transient noise analysis in spectre. Upon adding the noise sources, the variance of total noise increases. But when I add some more transistors to the circuit with an intention to...
View ArticleClik here to view.
Slide function issues when routing a wire
When I started using the wire routing tools I could hold ctl + Shift and my wire would slide up or down/left to right to align it with my begin or end point. For some time now I have not been able to...
View ArticleClik here to view.
VEC file in combination with Dynamic Parameter
Hi,I encounter big issue when trying to run the transient simulation with dynamic parameter (Temperature) and using VEC file.Some stimululi are corrupted, very deteriorated, some events even missing....
View ArticleClik here to view.
how to run a pvs drc in linux (multi gds)
Hi,I have a question about a pvs drc.There are several gds files. I want to verify this PVS DRC at once on linux terminal.(When verification is complete, Start DE of PVS DRC is automatically executed...
View ArticleClik here to view.
How to run a pvs drc in linux (with multi-gds files)
Hi,I have a question about a pvs drc.There are several gds files. I want to verify this PVS DRC at once on linux terminal.(When verification is complete, Start DE of PVS DRC is automatically executed...
View ArticleClik here to view.
Remote Host (Output Log Update Rate)
Hello,We have recently switched to simulating on a remote machine instead of locally. It works fine in terms of simulation but we have noticed that the output log update rate is much lower, also in ams...
View ArticleClik here to view.
how to plot THD against output voltage?
Hi,I want to calculate THD for OTA and plot the value against output voltage. I do not know which parameter I must be seep to vary output .can somebody help me step by step to do this to get the...
View ArticleClik here to view.
Max Jop Policy for single test simulation with corners
Hello,I would like to ask if if the "Max Jop Policy" can be used in single test simulation but with different corners'? so number of corneres can be run paralley to save simulation time.I usually use...
View Article