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Measuring DDJ (data dependent jitter). Cross function on eye-diagram
Hi,My Virtuoso and Spectre Version: ICADVM20.1-64b.NYISR30.2I plot an eye diagram using a built in function. I want to see the data-dependent jitter. I want to measure the eye diagram edges at zero...
View ArticleEVM and constellation of mixer
Hello,I am trying to design an RF mixer for a TX.Assume my input IF signal is at 1 GHz, my LO at 2 GHz and I want my RF at 3 GHz, and assume that the mixer fully works after testing it with HB.How to...
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nport device S-parameter data file relative path
Hi,In our design team, we're looking for a strategy to make all cell views self-contained. We are struggling to do so when nport devices are involved.The nport file requires a full path, whereas what...
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unbound variable freq
I want to plot the inductance through formula L1=(imag(Z(1,1))/(2*pi*freq)), but the system tells me that the freq is unbound variable? What can I do?
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IIP3 of Gilbert cell mixer
HiI'm learning Hb analysis for the IIP3 simulation of a gilbert mixer. My f_RF=5GHz, f_LO=4GHz and f_IF=1GHz . I'm a bit confused about setting the 1st order and 3rd order harmonic at the Direct plot...
View ArticlePSS Shooting - High Q crystal oscillator - Simulator by mistake detects a...
Hi *, I am simulating a 32kHz high Q crystal oscillator with a pulse shaping circuit. I set up a PSS analysis using the Shooting Newton engine. I set a beat frequency of 32k and used the crystal output...
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HB: duplicated frequencies in 3-tone simulation
I get multiple results at the same frequency in a 3-tone simulation.I try to determine the IP3 of a mixer. I have 3 large signal tones: 0.75 GHz, 1.25 GHz and 1.26 GHz.At the IM3 frequency of 490 MHz I...
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Colpitts Oscillator output power simulation
Hello everybody,As you can find in the attached image, I am trying to simulate a Colpitts oscillator. However, using pss analysis it shows a high output power. My question is where is the problem of my...
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Load Pull transistor simulation
Hello everyone,I am trying to perform a load pull simulation of a transistor to verify some gain calculations I made using its S-parameters. Specifically, I have calculated the optimal conjugate...
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Getting error while adding element in AWR software
While adding an element created from a netlist file in AWR, I am getting the error 'The element type being dropped is not compatible with the window it is being dropped into'. The netlist file in AWR...
View ArticleCross-coupled oscillator Stability simulation
Hello everyone,For my cross-coupled oscillator design, I have a problem with stability analysis. Based on my achieved results which are attached, where is my design...
View ArticleEMX - EM simulation for large CMOS chip
Hi everyone,I'm currently working on my thesis, which involves a beamformer system using CMOS 65nm technology. I'm trying to use the EMX tool for EM simulation but have encountered a few problems....
View ArticleFigures missing in the RF Design Blogs article of "Measuring Fmax for MOS...
Hi I noticed that some figures from the old posts in the cadence blogs have been missing.I think this problem happened before and Andrew Beckett asked the original author to fix the issue: Figures...
View ArticleTransient Simulation waveform abnormal
Hello EverybodyRecently, I want to design a high output Power Amplifier at 2.4GHz using TSMC 1P6M CMOS Bulk Process. I use its nmos_rf_25_6t transistor model to determine the approximate mosfet sizeI...
View ArticleUsing "nport" as a schematic circuit component
Hello everybody,I designed an inductor in HFSS and extracted its S-parameters. Now, I want to employ this inductor in my oscillator schematic design in cadence.How can I use "nport" component in my...
View ArticleN-path mixer power conversion gain calculation with PSS+PAC
I’m simulating an N-path mixer using ideal components. After performing a PSS+PAC analysis, I observed a positive power conversion gain, while I expected to see a power conversion loss instead. It's...
View ArticleHB tstab randomly giving bad results compared to regular transient
Spectre version: 23.1.0.403_ISR6Virtuoso: 23.1.ISR6*can't upload images for some reason.While running a harmonic balance configured like this:1. Run transient - Decide automatically.2. Run Envelope...
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Issue with EMX Oscillation Results for VCO and Coil
Hi,I used EMX to simulate my coil and connected it to the VCO core at the schematic level. The circuit oscillated up to 255 GHz (a semi-schematic level simulation). Next, I completed the layout for my...
View ArticleStabindex and S1/S2 in Sprobe Cadence
Hi,I added Sprobe to the LNA I designed to check the stability of interstages. But the results generated by Sprobe confuse me.For StabIndex, it is always less than 1. However, at some frequency, S1 and...
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2 Tone Test of a LC-VCO and LDO: Best setup to get a reliable Phase Noise...
Hi all,I have an LC-VCO and an LDO with a very bad PSRR at frequency 250KHz (gain is positive!). I apply 20mV, 250KHz sinewave tone at the input of the LDO (VIN) and I want to check the PSRR impact on...
View ArticleUsing deepprobe to see internal extracted nets
Hi,My Spectre version is 21.1.0.854.isr22.I want to use deepprobe to access extracted internal nets.I'm using QRC for extraction and use the dspf file.The purpose is to do some stability test (without...
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How do you optimize using Microwave Office?
I am trying to use this software to optimize my L and C values. I saw my professor teaching it but he is using the 17 version. I have AWR Design Environment (24.1) and I'm at a total loss with why this...
View Articledoing an em simulation with emx but with a parameter sweep
hello everyone,I have a transmission line that I want to extract hundreds of s2p files for hundreds of length values. Is there anyway to do an em simulation but with a sweep for the length ? I know...
View ArticleTurning off non-linearity contribution of cells
Hi,Spectre version: 23.1.0.594.isr12I was wondering if we can turn off non linearity contribution of a certain blocks in the design. Something similar to what is possible for noise analysis where you...
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Error in cds_srr (line 20)
Hi, In the MATLAB, I am using cds_srr and cds_innersrr commands. Although I set the path to the spectre root, I face this error:One or more output arguments not assigned during call to...
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