Cadence save transient operating point tran - and navigate to the device, and it will expand to show all the operating point data. So the settings are like this:. Originally posted in cdnusers. The spectre. e. 000003e-6 Jan 30, 2020 · I followed the steps you have suggested. What I would like to do is simulate this common programming phase once and then save the operating points for all the nodes. (Save DC Operation Point는 소자 특성 보기 위한 Option입니다. Happy learning! Mar 6, 2017 · 그리고 Save DC operation Point와 Enabled에 Check가 되어있어야 합니다. Apr 9, 2016 · I thought that in transient analysis the zero time and stop time points of current should be equal to the transient operating points of current at time 0 and stop time respectively. One way to achieve this is to create a file "tran_op. to save the results of the entire parameter sweep. scs” file as shown below. My extracted top cell name is clkdiv and its spf netlist has the following lines. Run the simulation. Sep 7, 2017 · The DC annotations would show the DC voltage and currents for the terminals, and the DC operating points gm, id, vsat_marg, vdsat and self gain. m1:all' for transient simulation. of my transistors and inside it put the name of the transistors information that I want to to be saved as follows: save T1:oppoint save T2:oppoint save T3:oppoint save T4:oppoint save T5:oppoint save T6:oppoint. - Hugh. And then went to adexl >model files and attached save Hello, I am using Cadence Virtuoso IC6. I want to find Operating Points of components at multiple time instants of a transient analysis. Then, for all the other sims I want to use the saved state as the starting point for the sim. psp1020, bsim3v3, vbic - take your pick). XXI69. This way I can save the long simulation time that the programming phase requires. gm and it will plot the gm versus time. scs" and include it with the model files. The reason is that it would need to save a lot of information otherwise In the "Operating Points" field, there's a "" button - did you press that? If you did, did you try the "get from simulation" button - and if so, did the list of operating points (including gm) appear? Also, if you look in the results browser, is there any sign of the M0:gm result? I suspect the models have hierarchy underneath, as I said. If you look in "spectre -h bsim4" you'll see there is a section labelled "Operating Point Parameters" which lists what you can get. ) Sweep variable은 DC Sweep할 변수를 설정하는 것인데 이것 역시 뒤에서 설명할겁니다. org by adbeckett Nov 10, 2021 · The best use of this feature is for a transient analysis when there is a bit of time after the initial time point for the netlist transient solution to recover from any slight differences in the DC operating point you choose and that it would normally compute at its first time point. g device Msrowin, operating point for ids). There's an option on the transient to save the final operating point, and also infotimes as you say - but then you only have these discrete times available for transient operating point annotation. org by Hugh Or in IC616 ISR12 or later (assuming you have saved the setting above) you can use the "ot" button in the calculator (like "vt" but for operating point transient) and click on the instance, and then pick "region" from the drop down list (essentially a list of what you saved) and plot it. 1Hz -> 100MHz) –Used for checking gain, phase, distortion –Can lie! Uses small signal models, not full large signal Oct 25, 2021 · The infotimes and infonames parameters may be specified when running a transient simulation to save the operating point information to a file(s) at a specific time(s) of the simulation for use as arguments to the transient simulation readic or readns (initial condition or nodes, respectively) commands in a future simulation. • Enter the time limits for simulation: Set the Stop Time to “ 50n ”. You should be able to get something like 77 different parameters (currently) from the operating point output for bsim4. I need to find the transient operating point of the device MMNDRV0. Record the instance name of the transistor (N0 is the instance name of the transistor in the above circuit). The file content will be: save Mswroin:ids About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features NFL Sunday Ticket Press Copyright save * sigtype=all . Right click on MN0. 1 2012 I am trying to plot different operating point components of the MOS transistor –Can do point-wise analysis (DC Operating Point) –X-axis is the voltage of a swept voltage source –Used for checking operating mode, bias currents AC Simulations –X-axis is the swept frequency of a voltage source (i. • In the window that pops up, select tran to choose a transient analysis. Any suggestions? HiI go through DC operating point analysis on Cadence. We use annotations for op points. Set up a circuit as shown in the figure below. However, that is not the case in my simulation. 1. Though in schematic the device MNDRV is --> MNDRV<1:0> with 48 fingers. Best Regards, Andrew. On the transient options form, there's a field called "infotimes" - specify the times at which you want it to output the dc operating point data. 4. there is no cap info in the results. Normally the transient operating point is showing you the final operating point at the end of the simulation - this is if you have "Save Final Op Pt" enabled on the Transient Options Form. your normal transient output tran. One way, I used "infotimes" option. The transient annotations will display the transient voltages and currents for the terminals, and also the vgs, ids, vds and vdsat transient operating points. you add an OP Parameter output). Feb 9, 2011 · This will describe how to save DC parameters of a MOSFET in Cadence. 뒤에서 좀더 설명합니다. But how I can use "OP( )" command in the script to extract/display the operting points of the components at differnt instants inserted in "infotimes" option. g. scs file as --> save clkdiv. Whilst it might seem a good idea to capture (say) the operating point as a set of node voltages/branch currents at a point in time and save this to a file, it could be problematic restoring that later, since even if you used it as an initial condition, it would probably clash with the driven voltages into the circuit unless they magically knew the time at which the operating point was captured How to feed this command ? Should it be done like spectre in 'saveop. 2. scs to save the dc operating point. What this is doing is telling it to additionally save the operating point data (or specifically gm) for a single transistor or set of transistors. 5-64 bit and ADE Spectre Version 11. scs' file ? Also i would like to know to determine other operating point parameters in transient as well as DC simulation in hspice, like how we do in 'save M3. I used the save command in . You could also save the OPs at discrete time points and calculate those dependent parameters afterwards. Normally this doesn't happen for DC sweeps, just DC operating points - in order to prevent a huge amount of data being produced that most of the time you don't need. The same approach will work if you want to save operating point during a transient - you can always just save the specific op point information by doing: save M0:gm M0:vdsat for example. Additionally you can fill in "infotimes" on the Transient Options form to say which times you want it to output a full operating point. MMNDRV0:region Apr 17, 2019 · You've never been able to annotate operating points from arbitrary times. Then you can check tools->results browser->dc-dc to see how all the dc op points vary with the parameter being swept. fc is the final operating point at the end of the transient (as set by the writefinal parameter). You are trying to read an initial condition file, but still asking it to compute the dc operating point - that's maybe OK, but it may make it hard to converge. Aug 7, 2020 · I created a text file and named it save_all. Thanks in advance Hi all! Could anybody please tell me how can I backannotate transient operating points in ADEXL for single montecarlo points? I am able to do it in "Single Run, Sweeps and Corners" mode, but when I switch to "Monte Carlo Sampling" mode, the "Annotate->Transient Operating Points" option goes grayed-out. indeed, i use the spectre from ic5141, and as you suggested above, i changed the infoname,and it works well now,i can see the node capacitance in the output log file, but i can't use the results->print->capacitance table or plot the capacitance versus time from the results browser. As you can see the transient operating point for id at the time zero: DC : M0:id =800. Open a text document, add the phrase “save N0:oppoint” and save it as “saveop. You can then annotate the "transient operating points" from any of these times after the simulation, or access them via the results browser. There are similar lists for other models(e. I want to plot the transient operating point of a device versus time (e. Hi Andrew, yes, you are right. The transient will run first, then the stb or ac will run using the final value from the transient as the operating point. Sep 4, 2012 · With the help of the calculator you can represent the function Veff=Vds-Vgs which gives you an approximate perception of the region -- at least a differentiation between triode & saturation region. 000003e-6 M1:id = 800. Mar 14, 2023 · A few small corrections: The comma won't cause a problem - it's effectively the same as a space in this context in SKILL; However, you won't get transient operating points unless you've explicitly saved them - which you can do by adding an oppoint output type (i. (that particular command might be a bit overkill, check spectre -h save for a more appropriate save command) The same approach will work if you want to save operating point during a transient - you can always just save the specific op point information by doing: save M0:gm M0:vdsat for example. This tells the simulator to use the final value of the transient simulation as the operating point for the stb or ac simulation. • Choose Enabled at the bottom of the screen and press OK. bluvp buv vfmre zehk awy camu qfsfsz lyas dfz yweuml