Cadence RF Design Forum

Corner and varible sweep simulation in spectre

lahsivece — Thu, 04 Apr 2013 05:08:19 GMT

Hi ,

I am trying to do a multivariable sweep and corner simulation in spectre .

In ocean , it is easy , I can do following

b0_list = list(0.0 1.2)
b1_list = list(0.0 1.2)
b2_list = list(0.0 1.2)

corners='("ss" "ff" "tt" "snfp" "fnsp")

foreach(corner corners

modelFile(list("<path_to_model_library>/model.lib.scs" sprintf(nil "%s" corner)))
foreach(x b2_list
desVar("b2" x)
foreach(y b1_list
desVar("b1" y)
foreach(z b0_list
desVar("b0" z)
resultsDir(sprintf(nil "<path_to_result_directory>/spectre/schematic/corner=%sb5=%gb4=%gb3=%gb2=%gb1=%gb0=%g",corner,b5_z,b4_y,b3_x,x,y,z))
run()
)
)
)
)

How can I modify above to use it for spectre simulations from command line ?

Due to some logistical issues , I can have access to either one MMSIM (for spectre) or IC514( for ocean) for simulation .

Please advise.

Thanks

Addition of Noise file to input voltage source of Cadence Spetcre

Analog Design — Thu, 03 Mar 2011 13:24:39 GMT

Hi.,

I am facing problem in adding noise in transient analysis in cadence spectre .

Can help me how to add noise as input source for transient analysis using simulator cadence spectre .

Virtuoso 6.1.3 help with impedance in sp analysis

freelee — Wed, 15 May 2013 23:27:15 GMT

I am using IC cadence 6.1.3. I need to use this expression

L = imag(Z₁₁ - Z₁₂Z₂₁/Z₂₂) / (2*pi*f)

to find the inductor's self resoance frequency. However, after I run sp analysis, the "zp" I obtained from direct plot separate the real and imaginary part. I need to obtain a complex representation of impedance z from the simulation result, so I can fit it into the equation above. I tried to use zp(1 1 ?result "sp") in the output setup expression, but apparently it doesn't give me the correct answer. If someone know my question and can give me an answer, in IC cadence 6.1.3 after sp analysis, how could I find the complex representation of impedance Z (Z11 Z22 Z12 Z21) that I can used in calculator to find self resonant frequency of inductor. And how do I represent the complex expressoin of S11 S22 as well? Please help if you know the answer. Thank you!

ASK modulated Signal

MicroShab — Fri, 10 May 2013 11:08:43 GMT

Hi,

I am designing an ASK demodulator.
Can you pls tell me how to give ASK modulated signal in Cadence ADE L?
I don't want to design ASK modulator and give that signal as input to demodulator. With the available instances Vsin/Vsource, how can I give a modulated signal to demodulator as input?

Is it possible to use AM index and frequency for this purpose?

Pspice ( Spice ) simulation from virtuoso.

kenblan — Tue, 23 Apr 2013 19:12:47 GMT

I will like to capture a schematic in virtuoso and run pscice simulation on it.

but i am runing into a netlisting problem

rectifier impedance-simulation

Magistus — Fri, 03 May 2013 15:05:46 GMT

hi,

first: sorry for my bad english!

i want to design the analog part of an RFID. to build an appropriate antenna i have to simulate the impedance at the hf1/hf2 pins of the analog part, especially the rectifier. but i am not sure, if a sp-analysis and plotting

imag(zp(1 1 ?result "sp"))

real(zp(1 1 ?result "sp"))

with a "port" connected to hf1 hf2 respectively is the right way. can anyone help me please?

thank you!

Run into problem with calculator plotting

madmarx — Wed, 03 Nov 2010 04:12:52 GMT

Hi,

I'm from university of southern california. I'm using cadence on school's server. However, whenever I try to use calculator to take derivertive or FFT of certain signal, it shows nilERROR (WIA-1091): Data transfer to Visualization & Analysis Tool failed. For assistance, contact Cadence Customer Support with the diagnostic information. The same error appears when I try to take pss simulation. All of my classmates are also running in to this problem. We cann't find the reason. Can someone help us?

Thanks

Yinfei Zhai

How to change .tran options in Virtuoso

HamidKhatibi — Fri, 12 Apr 2013 12:53:16 GMT

Hi everybody

Virtuoso cannot find a DC solution for my extracted (Calibre) circuit. The message says that I46_node0, where I46 refers to my main circuit symbol in the testbench circuit, has no path to ground. However the same circuit has no problem when I use the "Schematic" instead of "Calibre". My circuit I46 has no net0 in it! Hence I cannot understand which node is responsible for this problem!

I thought that I may need to change "gmin" in order to help transient analysis. However, I could not find where I have to change it!

Can anybody help me with it? How to change gmin and how to find a referred net in a circuit which from a symbol view.

Regards,

Hamid

PSS analysis not converging for VCDL

Amessi — Wed, 24 Apr 2013 09:26:56 GMT

I am designing a VCDL for DLL. But the PSS analysis is not converging. I am trying to change "reltol" value but @ very begining of simulation it is showing a warning

'reltol' is not a valid parameter for an instance of `pss' . Ignored

Can anyone tell me if I can change reltol value at all in PSS analysis?

Phase noise of VCO

sharad02 — Sat, 20 Apr 2013 12:01:18 GMT

My name is Sharad, I am a student. I am designing a Voltage Controlled oscillator with current mirror in Virtuoso tool. I am unable to do the phase noise calculations. Please guide me with the steps to perform the phase noise analyses.