*From*: alfred1520list <alfred1520list@xxxxxxxxx>*To*: Dave Cuthbert <telegrapher9@xxxxxxxxx>*Date*: Wed, 17 Sep 2014 10:18:04 -0700

Ah, it is obvious, the delay is for the entire length of the transmission line. Sorry for the noise. On September 17, 2014 8:35:04 AM PDT, Dave Cuthbert <telegrapher9@xxxxxxxxx> wrote: >The capacitance is the total capacitance of the t-line. Knowing the >effective relative dielectric constant and the line length you can >calculate the propagation delay. > >To check that you have calculated the correct L and C, run it thru the >formula Z = (L/C)^0.5 and Z should be the characteristic impedance. > > Dave Cuthbert > >On Wed, Sep 17, 2014 at 8:57 AM, alfred1520list ><alfred1520list@xxxxxxxxx> >wrote: > >> Hi Dave, >> >> Nice to know. Thanks. >> >> Does length play a part? Is it per unit length? What unit? Thanks. >> >> Best regards >> Alfred >> >> On September 17, 2014 5:57:16 AM PDT, Dave Cuthbert < >> telegrapher9@xxxxxxxxx> wrote: >>> >>> Song, here are my two favorite SI formulas (that's pretty geeky I >know): >>> C = t/Z >>> >>> L = t x Z >>> >>> The capacitance of a t-line (microstrip in your case) is the >propagation >>> delay divided by the line characteristic impedance. >>> >>> The inductance of a t-line is the propagation delay multiplied by >the line >>> characteristic impedance. >>> >>> Let's say you have a 50 ohm line and the propagation delay is 100 >ps. The >>> capacitance is 2 pF and the inductance is 5 nH. >>> >>> Dave Cuthbert, Narte Certified EMC Engineer >>> Consultant for EMC, SI, RF, Power Electronics, and most >everything analog >>> >>> On Tue, Sep 16, 2014 at 9:22 PM, C.C. Hwang <cchwang2013@xxxxxxxxx> >wrote: >>> >>> You can use a 2D solver (such as http://ataitec.com/free_2d_solver) >to >>>> compute all RLGC. >>>> Carl >>>> >>>> On Sun, Sep 14, 2014 at 4:42 PM, ï¿½ï¿½ï¿½ï¿½ï¿½ï¿½ï¿½ï¿½ï¿½ ><wangwensong1986@xxxxxxxxx> wrote: >>>> >>>> Hello everyone, >>>>> Now I want to calculate a approximate value for inductance of >microstrip >>>>> line over a ground plane. >>>>> >>>>> Anyone have any references you can send my way? I know I've been >able to >>>>> find this stuff in the past, but right now I'm coming up empty... >>>>> >>>>> Thank you. >>>>> >>>>> All the best, >>>>> >>>>> Song >>>>> >>>>> >>>>> ------------------------------ >>>>> >>>>> 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: >>>>> http://www.freelists.org/webpage/si-list >>>>> >>>>> For help: >>>>> si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field >>>>> >>>>> >>>>> List forum is accessible at: >>>>> http://tech.groups.yahoo.com/group/si-list >>>>> >>>>> List archives are viewable at: >>>>> http://www.freelists.org/archives/si-list >>>>> >>>>> Old (prior to June 6, 2001) list archives are viewable at: >>>>> http://www.qsl.net/wb6tpu >>>> >>>> >>>> >>>> >>>> >>>> ------------------------------ >>>> >>>> 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: >>>> http://www.freelists.org/webpage/si-list >>>> >>>> For help: >>>> si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field >>>> >>>> >>>> List forum is accessible at: >>>> http://tech.groups.yahoo.com/group/si-list >>>> >>>> List archives are viewable at: >>>> http://www.freelists.org/archives/si-list >>>> >>>> Old (prior to June 6, 2001) list archives are viewable at: >>>> http://www.qsl.net/wb6tpu >>> >>> >>> >>> >>> >>> ------------------------------ >>> >>> 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: >>> http://www.freelists.org/webpage/si-list >>> >>> For help: >>> si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field >>> >>> >>> List forum is accessible at: >>> http://tech.groups.yahoo.com/group/si-list >>> >>> List archives are viewable at: >>> http://www.freelists.org/archives/si-list >>> >>> Old (prior to June 6, 2001) list archives are viewable at: >>> http://www.qsl.net/wb6tpu >>> >>> >>> >> -- >> Sent from my Android phone with K-9 Mail. Please excuse my brevity. >> -- Sent from my Android phone with K-9 Mail. Please excuse my brevity. ------------------------------------------------------------------ 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: http://www.freelists.org/webpage/si-list For help: si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field List forum is accessible at: http://tech.groups.yahoo.com/group/si-list List archives are viewable at: http://www.freelists.org/archives/si-list Old (prior to June 6, 2001) list archives are viewable at: http://www.qsl.net/wb6tpu

**Follow-Ups**:

**References**:**[SI-LIST] Need a equation of inductance calculation for microstrip over the ground plane***From:*王文松

**[SI-LIST] Re: Need a equation of inductance calculation for microstrip over the ground plane***From:*C.C. Hwang

**[SI-LIST] Re: Need a equation of inductance calculation for microstrip over the ground plane***From:*Dave Cuthbert

**[SI-LIST] Re: Need a equation of inductance calculation for microstrip over the ground plane***From:*alfred1520list

**[SI-LIST] Re: Need a equation of inductance calculation for microstrip over the ground plane***From:*Dave Cuthbert

- » [SI-LIST] Need a equation of inductance calculation for microstrip over the ground plane - 王文松
- » [SI-LIST] Re: Need a equation of inductance calculation for microstrip over the ground plane - C.C. Hwang
- » [SI-LIST] Re: Need a equation of inductance calculation for microstrip over the ground plane - Dave Cuthbert
- » [SI-LIST] Re: Need a equation of inductance calculation for microstrip over the ground plane - alfred1520list
- » [SI-LIST] Re: Need a equation of inductance calculation for microstrip over the ground plane - colin_warwick
- » [SI-LIST] Re: Need a equation of inductance calculation for microstrip over the ground plane - Lambert Simonovich
- » [SI-LIST] Re: Need a equation of inductance calculation for microstrip over the ground plane - Dave Cuthbert
- » [SI-LIST] Re: Need a equation of inductance calculation for microstrip over the ground plane - alfred1520list
- » [SI-LIST] Re: Need a equation of inductance calculation for microstrip over the ground plane - Grasso, Charles
- » [SI-LIST] Re: Need a equation of inductance calculation for microstrip over the ground plane - Cristian Gozzi