Hello,

I am wondering where can I gain access to a parser (translator) that can convert iRCX files provided by the foundry to Proc files which is required by EMX? Thank you for your help.

Nan

Hi,

I wanted to save a current through a cap for an HBAC following an HB.

This current is saved by HB, but not by HBAC. Have I stumbled into some bug or am I doing something wrong?

I've worked around the issue by placing an explicit current probe, however I'm just curious.

Regards,

Michele

Hi Community,

Am I mistaken if I assume that Virtuoso doesn't allow you to directly use a already present bbspice file in the simulation? 

I know that a rfm file is accepted, we just need to choose "rfm" as the data format in the nport form. Is there no possibility to directly use a bbspice file in this way? 

Before you ask why I am not letting cadence generate the bbspice file for me, let me answer that question. The conversion seems to take really long when done in spectre. With ADS it is generated really fast.

Another question related to this, is the S-parameter data format "spectre" not supported as well? I can generate both a bbspice and a spectre file in ADS from an existing citifile. Can I not use this spectre file directly with the nport? At least the possibility seems to be present. But when I tried to do that, I am getting the following error.



The scs file looks ok to me. Here is a snippet : 


Any suggestions on what is going wrong here?

Regards,

Amit

Hello,

I'm running AWR Microwave Office on version 13.03r build 8415 Rev 1. I'm new to the software, and so far I've been unable to take measurements that require HB simulation.

When I add a nonlinear measurement to a graph using APLAC HB (e.g. the CDC measurement of a varactor as shown in the Varactor_Plot example, or the total power PT at a node where I've placed an MProbe) and begin the simulation, I'm met with the error message "Can't perform harmonic balance simulation at 0 frequency." I have a project-wide logarithmic frequency sweep from 100MHz to 1GHz, so I'm quite sure that I'm not attempting any DC-only simulation. I have also tried to use the Harmonic Balance (legacy) simulator, and similarly I see the message "Unable to compute [CDC measurement]."

I have tried setting an alternative range of frequencies exclusive to this schematic (FDOC rather than FPROJ) and using that (held constant at 50 MHz) in the measurement settings to no avail. I've made sure that in Options > Default Circuit Options > AWR Sim Tab I have enabled the "Compute Q, C and G for nonlinear sources" option. I have changed the simulation type to Frequency domain in the APLAC Sim tab's Scripting Options and set a Nominal Frequency of 50 MHz in Miscellaneous Options, and I'm still getting the same error messages.

I hope that this is something simple that I'm missing, since a lot of my intended use for AWRMO involves HB simulation.

I'm also intending on updating my software version to the latest v16 release in the very near future, but this problem is debilitating enough to one of the program's main features that I doubt it's anything other than a personal issue. If so I will most likely run into it again on the new version.

I appreciate any help anyone can throw my way.

Thanks!

Hi all,

I'm looking to design a tunable filter using a pair of diodes with the following C/V curves: 

I've opted to simplify my model in AWR's Microwave Office (13.03r build 8415 Rev 1) by representing them using the Simple Varactor Model (VRCTR). Those familiar with this model may know that you can provide it with CV data and it will attempt to approximate the curve using a polynomial of an order specified by the user (1-7).

I have attempted to do so in this case, however the data from the curve on the left, when entered into the model, will throw me a message saying the approximated curve has an error greater than 20% (which causes the simulation to fail) unless I use a 7th order polynomial. Even then, the curve is still off and causes inaccuracies in behavior when used in my desired circuit. The data from the curve on the right will always cause an error greater than 20% regardless of which order polynomial I specify.

This doesn't make sense to me, since those curves appear pretty straightforwardly logarithmic and shouldn't take more than a 3rd or 4th order polynomial to approximate accurately. Has anyone else run into this problem with the VRCTR model, and if so how did you remedy it?

Additionally, I've given some thought to other ways I can model a varactor diode in AWR. First, the DIODE2 model seems promising since I can simply enter the linear capacitance as a parameter, but I will have to use some scripting or otherwise similarly inaccurate, excel-generated equations to make it dependent on a swept voltage elsewhere in the circuit. I'm also considering the PNCAP model, although it's not exactly clear to me how to set its CJ0, VJ, and FC parameters to exhibit the curve that I want.

I'd appreciate any thoughts or wisdom community members might have regarding this type of modeling.

Thanks!

Hi,

I read in the manual that the Harmonic Port option of the PORT component is available for harmonic balance large-signal analyses only:

For reasons I cannot yet understand, however, I am not able to make my (very ideal, maybe that's the reason) circuit to work properly with HB.

I have no issues with PSS-shooting though, so after much troubleshooting, I just decided to use that.

I just checked that PSS with HB engine works OK-ish

My end goal is to perform an AC sweep on top of the nonlinear simulation, either PAC or HBAC, so overall I guess my questions are:

- Does the harmonic port option work for PSS with HB engine? 

- I read "HB large-signal analysis" so better ask: is this port option working for small signal analysis like HBAC and - in case - PAC?

Thanks!

Michele

Can anyone please suggest

me how to calculate the kickback noise voltage and clock-feed-through voltage of Dynamic latch comparator in CADENCE?

I'm using IC6.1.8-64b.83.  I'm opening ADE L and simulating using hspiceD Q-2020.03 linux64.

I've created a circuit using either an nmos_vtg or pmos of the same variety.  The nmos/pmos_vth that our professor gave us to use isn't working.  I've never used cadence before and what I've done to try and figure this out is that I've searched for the same thing on web.  Only thing that I have found is stuff that deals with spectre or some way to do it using scripting (which I'm very unfamiliar with).  The TA's and professor are very much disassociated from the class and are not/have not responded to this same request.

I've created my circuit, saved and checked it (I have no errors or warnings).  I launch ADE L and change my sim to hspiceD.  I load the respected model libraries.  I set up my analysis with tran and dc settings.  I plot the drain on the nmos for output.  What I get with the plot is transient response and dc response.  Both are measured in microAmps.  I've attempted to print dc operating points as well and I get a blank "Results Display Window".

I cannot find a thing on the web that pertains to items that I've mentioned here.  In the support area under RF design I went back to about page 10 without finding anything that references this.

Hi,

I ran into a new unknown error with the new Aug 5 version and Spectre and semi old R2019b version of Matlab.  I will try new version of Matlab and post back.  I could not find 211 in the Matlab compatibility matrix at :

support.cadence.com/.../ArticleAttachmentPortal

New Error: 

Invalid MEX-file '/home/nima/tools/SPECTRE211/tools.lnx86/spectre/matlab/64bit/cds_innersrr.mexa64': /home/nima/tools/MATLAB/R2019b/bin/glnxa64/../../sys/os/glnxa64/libstdc++.so.6: version `CXXABI_1.3.11' not found (required by
/home/nima/tools/SPECTRE211/tools.lnx86/spectre/matlab/64bit/../../../lib/64bit/libsrr.so)

Error in cds_srr (line 20)
sig = cds_innersrr(dirname, dataset, signame, verbose);

Error in techsweep_spectre_run_tsmc_2_1p8v (line 61)
struct_n = cds_srr(c.outfile, c.sweep, params_n{1});

Thanks,

Nima

Dear Sir/Madam

I'm using virtuoso ic618hf with spectre 191hf.

I'm trying to simulate the input admittance of a open-loaded loss-less transmission line (using mtline from analogLib with the RLGC form ).

Due to my perfonal application, I need to check its admittance at both postive/negative frequency using PSP (e.g. +20GHz and -20GHz).

When I used Harmonic Balance engine for PSS, the results of PSP at postive & negative frequency are indeed conjugate. However, when I use shooting engine. the admittance at both positive and negative frequency are the same (both real and imaginary part).

Since there are some square-wave LOs in my circuit, shooting should be much faster and more accurate if this problem can be solved.

Any comment is welcomed.

Best regards,

Yang

Hello all,

I'm using AWR Design Environment 16.03.12629.

I am trying to export data from AWR to matlab using the output file option.

However when exporting the data calculated in output equation files I'm running into an error.

To reproduce the error I set up a new project with a very basic circuit consisting of an ACVS connected to a 1 ohm resistor and set up the following ouput equation file:

#

I can succesfully plot Yxp in a tabular graph and will see the expected rsults of Itime.

However when exporting the results using an output file I get the following error:

 Measurement - :MATLAB("circ1eqs:Re(Eqn(Yxp))",X,Y,0,"testfile") : Cannot create EQN simulator for document 'circ1eqs.$FDOC' (Document 'circ1eqs' not found).

which appears to indicate that it cannot find the output equation file, I noticed that when renaming the output equation file identically to the circuit schematic the error message would change to:

 Measurement - :MATLAB("circ1:Re(Eqn(Yxp))",X,Y,0,"testfile") : Cannot create EQN simulator for document 'circ1.$FDOC' (Simulator not available (no license?)).

I would add that I was able to succesfully use the matlab output files for any measurements from circuits schematic files, it just fails for equations.

Has anyone seen this error before?

Many thanks!

Designed an edge coupled BPF using microstrip lines. The same dimensions have been used for CPW coupled lines CPW2LINA. In the layout view the coplanar gnd plane is invisible. While doing EM analysis using Analyst, getting the same results that of the edge coupled using microstrip lines. Is it correct? Will edge coupled microstrip filter and edge coupled CPW filter behaves same for same dimensions?

Hi,

On n-port extraction of passives (in this case a transformer), I observe that pin selection (internal or edge) has effect on L and Q. My question is, which one is correct (closer to Silicon)?

Also, on EMX form, advanced options, when should we ever select the "Radiation" box?

Thanks!

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The DC Operating Point of a NMOS is shown below. I want to know the parasitic capacitance of the NMOS. But there are cgs, cgsbo, cds and cdsbo. cds equals cdsbo while cgs does not equal to cgsbo. So what is the difference between parasitic capacitance with suffix "bo" and without it. I don't quite understand.

Look forward to your reply.

Hi, 

we have quite a noisy osc for app. 65MHz, and we are not sure if pss and pnoise results are 100% correct (like using lorentzian setting or not). So we run a long tran noise simulation, and can e.g. plot period jitter vs time (or cycle). But how to get phase noise from this time domain data? Can I do it within Cadence?

Best regards Stephan

Hello, I am new here so I don't know if this is the correct spot for MWO questions so if not, please let me know where to go. I am having an issue using the dynamic voiding in MWO layout. According to the documentation, setting up dynamic voiding is possible but I can not get it to work. I have tried the steps listed in section 3.14.1 to 3.14.6 here: https://awrcorp.com/download/faq/english/docs/Layout/layout_editing.html.  As shown in the layout (see last image in post), the rectangle is a dynamic shape (on the layer GND+) and the trace is a signal shape assigned to a process line type (Top Copper). The layer process file has the voiding settings: 

The rectangle has the properties and is associated with the net GND: 

And the trace has the properties and is associated with the net EN3 : 

Dynamic voiding is turned on, but I get the layout below (no voiding): 

What am I missing? 

I am trying to ado simultaneous load and source pull in cadence

I followed the instructions given in the previous discussion (https://community.cadence.com/cadence_technology_forums/f/rf-design/40896/simultaneous-load-pull-and-source-pull-simulation-in-cadence#) but can't find the correct file related to source/load pull simulations in the installation directory

is it possible to provide the name of the file so that I can ask if it may be hidden somewhere in the drive? I can only see 7 tutorials related to RF workshop mentioned!

Thanks 

Hi everybody,

I am using Pss/Pnoise to simulate NF of a 4-path band pass filter. In term of theory, this NF is medium around 5 to 10 dB depending on the switching frequency, which is 

contributed by thermal noise of source resistance, switch resistance and noise folding from other harmonics of switching frequency., flicker noise is supposed to be neglected because there is no DC current from port 1 to port 2

However, the simulation is a little weird to me (it is around 27 dB at 2.41 GHz - center frequency of filter). 

Is there any wrong here, could you help to figure out some possible reasons? (any culprit that is able to fold the flicker noise into the desired band, because there is a peak in simulation result) 

my circuit infor: it has a divider/4 from 9.64 GHz to 2.41 GHz controls cmos switches 

input: 2.41gHz 

output 2.41 GHz 

insertion loss: around 5 dB 

source resistance: 50 ohm at two port  

here is my setting for pss/pnoise: 

thanks for any advice.

Binh Ngo