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# Virtuoso 6.1.3 help with impedance in sp analysis

Last post Wed, May 29 2013 3:50 AM by Andrew Beckett. 1 replies.
 Started by freelee 15 May 2013 04:27 PM. Topic has 1 replies and 820 views
• #### Wed, May 15 2013 4:27 PM

• freelee
• Joined on Wed, May 15 2013
• Posts 1
• Points 20
Virtuoso 6.1.3 help with impedance in sp analysis
 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!
• Post Points: 20
• #### Wed, May 29 2013 3:50 AM

Re: Virtuoso 6.1.3 help with impedance in sp analysis
 Maybe this solution will help you?Kind Regards,Andrew.
• Post Points: 5
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 Started by freelee at 15 May 2013 04:27 PM. Topic has 1 replies.