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Spectre Impedance

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34 Threads found on edaboard.com: Spectre Impedance
Cadence spectre does not like floating nodes,high impedance nodes,internal current loops etc.Therefore I used to use very high resistances to floating nodes, very small resistances to high valued capacitors to make it faking out.It's very messy simulator.
If you have access to spectre or any simulator which can measure S11, you can drive the line deferentially while varying the source impedance. The value of source impedance which minimizes S11 is your differential characteristic impedance. Same can be done for common mode.
Use "xmfr". "analogLib/xfmr" is a "transformer" as spectre Primitive. hoge (t1 b1 t2 b2) transformer n1=1 n2=sqrt(100/5) see "spectre -h transformer".
I tried to measure the input impedance of differential input stage of mixer using s2p analysis in Cadence spectre RF, I got same Z11 in following cases 1) When the Port connected deferentially 2) Using AnalogLib ideal_balun 3) Using RFlib balun (with Balanced output impedance set to 25 Ohms), with balanced output (...)
Hi, I'm trying to use spectre to get output impedance of following circuit 96600 I can do AC sweep and use Vout/Iout to see the output impedance VS frequency. But in this way i can not see the influence of input square wave switching. If i want to see the influence of this square wave, should i use PSS or PSP simulat
I am trying to design a rectifier block for an inductive link. However, I am facing issues with transient simulation in spectre, Cadence. As an example following is a simple resonant tank driven by an ac source with 50 ohm input impedance. The ac source is modeled by a sine voltage source with 50 ohm resistance in series. Series resonant tank consi
Hi, I have to simulate the gain of my designed LNA with certain antenna impedance as a source. I am using cadence spectre for the simulation. The problem is that cadence spectre provides n1port for importing S11 parameters of antenna, which is a passive port. Therefore, if i connect the n1port at LNA input to represent antenna, i (...)
hey iam designing an osc. and i need to see the impedance of the ct. across el LC tank and to check if it is -ve or not any advices on the method using spectre also i need to draw the impedance locus diagram across LC tank , any advices for the technique used (imag. Z on y axis vs real Z on xaxis) thanks
Hi guys, I've gotten something unsure about noise factor. Hope for help here. The Noise Factor is defined as below. N = (Na+G*Ns)/(G*Ns). Different Ns produces different N. And in Cadence spectre, the noise source is usually a port. The impedance of the port provides the thermal noise 4kTRB V^2, which is related to the value of R. Q1: What
Does any body know how to measure the lc tank quality factor with software(rf spectre .i.e cadence) and by calculations too? is it possible to get 900 ohm impedance of an lc tank ?(this lc tank was used for an lna load.)( l=5.49nH , c=651fF).the lna has a dc blocking cap of 2pF value after the tank. what is the relation between the (...)
is output port must be added for IIP3 measurement? if port needed what should be its impedance.iam getting different IIP3 results with and without the port and also different results for different port impedances.help me please.................
Hi Guys: I had integrated a buffer stage at the output of the designed VCO, for isolation. How do I measure the S21 and S12 plot of this buffer stage in spectre-RF to observe the isolation characteristic. Thanks in advance Rgds
is Z-parameter from s-parameter analysis in cadence spectre RF will give correct input impedance.I want to calculate input impedance of my Low noise amplifier circuit. Whether input impedance is equal to Z11 parameter.?thanks in advance
Hi, all. In spectre, we can get the node capacitance of the circuit. But these node caps only include the gate caps, excluding the junction caps. Does anybody know how to get the junction caps in spectre? i am not meaning just one transitor, I mean the node connected to every relevant transitor (especially to transistor source or drain).
we can use .print cap(node) to plot capacitor curves in hspice. But how do we do that in spectre? I found there was a captab option in transient analysis. But it seems that it only calculate a capacitors at one point... Is there any idea?
Look stability analysis in spectre help.
I want to see output impedance of an amplifier. I know the method.. result->print->1/gds But I heard that there is xf analysis in spectre like in hspice. And I tried xf analysis, but I didn't get correct data. Please help me. Just I want to know the output impedance. 1. How to make the scheme for measurement? 2. How to setting th
If you think of the circuit as a blackbox, take the node you want to get the output impedeance of. instantiate a capacitor of a very high value in spectre (>1MegaF). Connect one terminal of the capacitor to the node you want ot measure the output impedance of, and connect the other terminal to an AC voltage source and have the AC magnitude as 1. Ru
Thanks
If you do ac analysis in spectre simulator, and then print the DC operating point of the interesting transistor, you will see gds and ro. Normally I treat 1/gds as the output impedance of the transistor, is that correct ? However, I still see that there is another paramater : ro, is it the same one ? which one should be used for analog de


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