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Complex filter : Image Reject Ratio (IRR) calculation
Hi ,How do I simulate IRR of complex filter. ? ( A transient simulation of an IQ mixer followed by a complex filter and then look at dft of the output waveforms is one way ) Is there a cadence...
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cadence pz analysis
for a two stage opa as Allen described,with a compensation cap,with the cadence pz analysis,found that there are 5 poles,5 zeros ,is that right? somebody said that should cancel some pole-zero...
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Transient results as starting point in PSS
Hello,Could we use the transient analysis results as a stabilization point (tstab) for PSS analysis? If so, how could we acheive it? Is there any documentation on this? Any inputs will be helpful....
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Confusion regarding captab output ( Drain & Gate ; Gate & Drain)
Dear All,I was trying to find out the Cgd value of a MOS.I did cpatab dc analysis.But I am confused as it is showing two differnent values for Drain-&-Gate capacitance & for Gate-&-Drain...
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K Stability factor
Hi I use SP analysis in ADE L and draw the KF (stability factor).The result is different compared to the K factor derived from any known equations (I got the equations from Pozar's book). i.e. I use...
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analogLib in cadence 6.1.5 (LNA simulation)
Hello, I was looking for some help. I am a graduate student who is looking to perform some s parameter analysis on a LNA. The version of cadence licensed to my university (UMKC) is 6.1.5. Most...
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custom inductor/tline layout Assura LVS issue
Hi there, I need to incorporate a few custom designed transmission lines and inductors in to a TSMC 65nm tapeout. I found a document from another TSMC pdk about using Assura ?blackboxcell option to do...
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Seeking for Help in PSS Analysis
Hi i am a beginner in using Cadence. I am designing a LNA and i meet problem when come to PSS analysis. My pss analysis could not run and terminated. I am clueless and have no idea. Could anyone please...
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Seeking for Help in PSS Analysis
Hi i am a beginner in using Cadence. I am designing a LNA and i meet problem when come to PSS analysis. My pss analysis could not run and terminated. I am clueless and have no idea. Could anyone please...
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Measuring Load-Pull contours - Spectre User Guide example
Hi,I am trying to generate load-pull contours to determine the optimal load of my amplifier. I work with virtuoso 6.1.5. I follow the instructions given in "Virtuoso Spectre Circuit Simulator RF...
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Can a beginner ask here for some help?
Hi, I am a student at local faculty of Electrical Engineeing, and I just recently started using Cadence Virtuoso. The thing is, I am also employed, and I'm attending this course in RF electronics at...
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error in creating netlist
I followed the tutorial in the link below about creating netlist file for hspice simulation. http://www.ece.rice.edu/~cavallar/cadence/tutorial/netlist.htmlI got two problems. Hope you could help.1. I...
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Impedance measurement
Sir/Madam, I have been designing a Differential drive rectiifer for UHF passive RFID in 130nm CMOS process. As the design of rectifier completes I got stuck with the impedance measurement, i.e. for...
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ERROR (SPECTRE-4080): There are no components in the circuit.
Dear Friends,I use Cadence Virtuoso version 6.1.5 with Spectre MMSIM 071.I tried to simulate a simple circuit by it. But I have faced this problem:Loading...
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How to avoid Hidden State in VerilogA model for SpectreRF
Dear All,I am a beginner in verilogA .I wrote a code but when I ran PSS it showed hidden state in the code and didn't run.My behavioural model is as below:- // VerilogA for VERILOG_A_MODEL,...
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ERROR (VACOMP-1008): Cannot compile ahdlcmi module library
Dear Friends,I have faced to this problem, when I have added a VARICAP to my VCO circuit.Error found by spectre during AHDL read-in. ERROR (VACOMP-1008): Cannot compile ahdlcmi module library. Check...
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Z parameters - Mason's invariant varies!
HiAdding the inductor at Source, the Z11 would become Z11+jwL and hence real(Z11) should remain unchanged. However, using SP analysis (Virtuoso - ADE L), by changing the inductor at Source, real(Z11)...
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Plot two variables vs. each other
Dear friendsIn ADE-L, is it possible to sweep on variable "x" (e.g. frequency) and calculate y and z, and plot y vs. z ?What I can do right now is to plot both y and z versus x and I do not know how...
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injection locked oscillator phase noise simulation using pss+pnoise
Hi all,I am designing an injection locked vco. My simulation scenario for the phase noise is as follows:1. Run the vco without the injection signal for 2 microseconds ; let it setttle to the free...
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nonlinear resistance definition in Spectre
Hi, I need to model a nonlinear resistance in spectre but i don't know how to, pleas help me.thanks alot.
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