James, For low frequencies I believe you could use a smith chart as long as your DUT is less than a quarter wavelength at the frequency of interest. Use a short for the inductance and an open for the capacitance. L would be equal to the imaginary portion of the measurement from the smith chart divided by 2pi*f. The capacitance is equal to 1 / (reflection coefficient*2pi*f). These equations assume that the VNA reading is not normalized. If the DUT has significant losses, or the frequency gets too high the trace on the smith chart will start to spiral inward because the impedance is no longer purely imaginary making this method worthless. You may be able to get more accurate measurements if you create two identical structures that vary only in length. This will help to reduce the affects of the vias, probes, pads, etc if the paracitics of these things are significant compared to the DUT. If you use 2 structures you can take the difference in the measured parasitics divided by the difference in the length which will yield the L or C per unit length. There may be other methods, but thought I would just throw this out there to chew on. CC -----Original Message----- From: James H [mailto:jamesh235914@xxxxxxxxx] Sent: Monday, August 27, 2007 11:38 To: si-list@xxxxxxxxxxxxx Subject: [SI-LIST] How to measure the resistance, inductance and capacitance parasitic of a packaged chip? Dear All, I am studying how to measure the resistance, inductance and capacitance parasitic of a packaged chip. What is the best method to model and measure the parasitic of a chip+package? If I get S11 parametric by one port measurement, how could I use S11 parametric fit to get the resistance, inductance and capacitance value? Thanks & Best Regards, H ------------------------------------------------------------------ To unsubscribe from si-list: si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field or to administer your membership from a web page, go to: //www.freelists.org/webpage/si-list For help: si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field List technical documents are available at: http://www.si-list.net List archives are viewable at: //www.freelists.org/archives/si-list or at our remote archives: http://groups.yahoo.com/group/si-list/messages Old (prior to June 6, 2001) list archives are viewable at: http://www.qsl.net/wb6tpu |**************************************************************************| This email is intended only for the person or entity to which it is addressed and may contain confidential, proprietary and/or privileged material. Any review, distribution, reliance on, or other use of this information by persons or entities other than the intended recipient is prohibited. If you receive this message in error, please immediately notify the sender and delete it and all copies of it from your system. Thank you. |**************************************************************************| ------------------------------------------------------------------ To unsubscribe from si-list: si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field or to administer your membership from a web page, go to: //www.freelists.org/webpage/si-list For help: si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field List technical documents are available at: http://www.si-list.net List archives are viewable at: //www.freelists.org/archives/si-list or at our remote archives: http://groups.yahoo.com/group/si-list/messages Old (prior to June 6, 2001) list archives are viewable at: http://www.qsl.net/wb6tpu