Mex-Wcalc: ic_microstrip_syn
Description: Wcalc: A transmission line calculator
Keywords: coupled microstrip, coupled microstrip analysis, coupled microstrip synthesis, microstrip, microstrip analysis, microstrip synthesis, stripline, stripline analysis, stripline synthesis,

| Mex-Wcalc: ic_microstrip_syn ic_microstrip_syn - Integrated circuit microstrip transmission line synthesis ## SYNOPSIS [w_out, h_out, tox_out, l_out] = ic_microstrip_syn(z0, w, h, l, tmet, rho, rough, er, tand, f, flag) ## PARAMETERS ### INPUT PARAMETERS z0 : desired characteristic impedance (Ohms) w : width of ic_microstrip line (meters) h : substrate thickness (meters) l : lentgh of ic_microstrip line (meters) tmet : metal thickness (meters) rho : resistivity of wire (relative to copper) rough : conductor surface roughness (meters-rms) er : substrate relative permitivitty tand : substrate loss tangent f : synthesis frequency (Hz) flag : indicates which parameters should be optimized flag=1 : synthesize the metal width flag=1 : synthesize the substrate thickness flag=2 : synthesize the oxide thickness ### OUTPUT VALUES w_out : calculated metal width h_out : calculated substrate thickness tox_out : calculated oxide thickness l_out : calculated metal length ## DESCRIPTION Function to synthesize the physical dimenstions of a single ic_microstrip transmission line to achieve a desired characteristic impedance and electrical length. The desired characteristic impedance and some of the physical dimensions of the ic_microstrip line are given as inputs and the remaining dimensions are calculated. The model accounts for dispersion (frequency dependent propagation velocity). ``
                     |<--W-->|
                      _______
                     | metal | <- tmet,rho,rough
        ----------------------------------------------
       {**************  Oxide (tox,eox) **************
        ----------------------------------------------
       (  substrate                          /|\     (
        )   es,sigmas                     H   |       )
       (                                     \|/     (
        ----------------------------------------------
        XXXXXXXXXXXXXXXXXX ground XXXXXXXXXXXXXXXXXXXX
## EXAMPLE
     % desired impedance
    z0=75;
     % desired electrical length (degrees)
    elen=90;
     % micron to meters conversion factor
    sf=1.0e-6;
     % width
    w=160e-6;
     % length
    l=1000e-6;
     % oxide thickness
    tox=1.0e-6;
     % oxide relative dielectric constant
    eox=4.0;
     % substrate thickness
    h=250e-6;
     % substrate relative dielectric constant
    es=11.8;
     % substrate conductivity (1/(ohm-m))
    sigmas=10;
     % metal thickness
    tmet=1.6e-6;
     % metal resitivity (ohm-m)
    rho=3e-8;
     % metal surface roughness
    rough=0;
     % frequency
    f=2.4e9;
     % synthesize width
    flag=0;
    [w_out,h_out,tox_out,l_out] = ...
        ic_microstrip_syn(z0,elen,w,l,tox,eox,h,es,sigmas,tmet,rho,rough,f,flag);
    disp(sprintf('w   = %8.3g um', w_out*1e6));
    disp(sprintf('h   = %8.3g um', h_out*1e6));
    disp(sprintf('tox = %8.3g um', tox_out*1e6));
    disp(sprintf('l   = %8.3g um', l_out*1e6));
## SEE ALSO air_coil_calc air_coil_syn coax_calc coax_syn coupled_microstrip_calc coupled_microstrip_syn ic_microstrip_calc ic_microstrip_syn microstrip_calc microstrip_syn stripline_calc stripline_syn ## AUTHOR Dan McMahill ## BUGS None known Return to the MEX-Wcalc page.
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