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What is the use/meaning of "Choose Harmonics of PORT" in PSP analysis ?
 Dear All,In PSP(PSS, Shooting meyhod) analysis there is one option called "Choose Harmonics" under "Select PORTS" menu.I am NOT able to understand what is its role. What is its use when you are...
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Interfacing Spectre Parametric analysis result to MATLAB in command.
Dear All,I was trying to plot the swept DC operating points of a MOS transitor with changing some parameters of the MOS. Like I swept the Vgs of MOS and did the parametirc run on 'Length' of the MOS....
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PA constant efficiency contours
Hi,I am trying to do a load-pull simulation to study the optimal load condition for a CMOS Power Amplifier. For this, I use the parametric PSS simulation with a portAdapter to traverse all possible...
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Parametric Sweep for PSS type analysis and MATLAB interface
Dear All,I want to do parametric sweep of some variables of my circuit. For example I want to find IIP3 by running PSS and PAC and I want to plot the IIP3 vs value of one parameter by sweeping that...
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Gate Resistance Extraction in Spectre
Hello All,    I am trying to understand how to calculate and extract the gate resistance in RFCMOS. I am using IBM90nm (cms9flp) and using nmos_rf device. BSIM4 manual lists the equations for Gate...
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what are rgbi and rgbd ??
Hello All,  Output parameters of spectre for BSIM4 model lists two resistances rgbi and rgbd. Spectre Manual gives same description for both of them,'Gate Bias dependent resistance'. I am not sure...
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MATLAB-spectre interface reading conjugate AC simulation value
 Dear All,I used the Matlab-spectre interface commmand to draw AC simulation result of SPECTRE in MATLAB.The comand I used are belw:-resdir =...
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Phase noise simulation in ring oscillator
I have two questions regarding the phase noise simulation results (PSS + Pnoise) for ring oscillators:(1) How much the precision of the initial oscillation frequency is important in estimating phase...
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A tran simulation problem of RLC resonated network.
Hi everyone,A RLC resonant network is as Figure 1, seen at my post below. L=1uH, C=1uF, R=100kOhms. Source generates a sine wave signal. The source signal's frequency is 159.155kHz and its amplitude is...
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Unrealsitic Fmax simulation of IBM 90nm in cadence
Hello All, I am trying to measure Fmax of IBM 90nm technology in cadence. I am measuring S parameters and plotting Gumx. I get Fmax around 500GHz for 90nm while reported Fmax for 90nm are around...
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S parameter plot
 HiI am a newbie. I want to plot S parameters in Cadence 6.1 . I have been trying hard but in vain. The problem is the port selection menu is not accepting any inputs from teh schematic. so it remains...
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mtline model "Display Cross Section"
 Hello,As you know that there is now a cross sectional viewer button in the analogLib mtline component edit properties/add instance form.  The "Display Cross Section" button becomes visible when the...
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EDN article about Rohde & Schwarz using Virtuoso-APS
A recent article at EDN gives some examples of how Rohde & Schwarz (which is where I work) uses Virtuoso-APS. It highlights some of the more advanced features of this simulator.
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Noise Figure discrepancies in LNA design
This question is regarding noise figure in a simple common-emitter LNA in the W-Band. There are two main simulations that I am using:A) sp analysis with noise set to "yes" and the input/output ports...
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PSS/Transient Spectre/APS discrepancies
I'm running a simple circuit with PSS. I decided to compare the results to Transient, and found that they differ by a significant amount. My output amplitude is 783mV with PSS(spectre), 772mV with...
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Base-emitter and base-collector depletion capacitances
Dear all,I am looking for base-emitter depletion capacitance (CjeO) and base-collector depletion capacitance (CjcO) with related paramters for the calculation of Cje and Cjc for SiGe bipolar...
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DC Operating Points not displayed on Schematic Diagram (ADE 5.10; USR 6.127)
All, I have recently installed a new Model Library, and am unable to see the DC Operating Points on the schematic diagram after clicking on Results->Annotate->DC Operating Points in Virtuoso ADE....
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changing the simulator sampling time
 HiI was trying to import cadence spectre values into matlab for analysis. I assumed that cadence samples a sinusoid for a given freq, for example if theoretically from transient signal of length upto...
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Saving operating points of a device inside an instance
 Hi all,I was trying to save the operating points of a transistor M113, which wasinside an instance I4. I have put "save I4.M113:all" in ny saveop.scs file. but its giving a message "IM113 is not a...
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