The Designer's Guide Community Forum https://designers-guide.org/forum/YaBB.pl Design >> RF Design >> intercept point IIP3 ?? https://designers-guide.org/forum/YaBB.pl?num=1180964813 Message started by BERBEREPHONE on Jun 4th, 2007, 6:46am

Title: intercept point IIP3 ?? Post by BERBEREPHONE on Jun 4th, 2007, 6:46am hello has all, please can somebody of you say themselves to me how schematically to extract the point from interception of order 3 (IIP3) under ELDORF for my mixer?? I arrive has frequentiellement to extract only IM3. thus I want to have on the same diagram the point of compression 1dB and the IIP3. veiled to fichier.cir it that I use to define the point 1dB and the IM3: * PROJET NAME : * LIBNAME     : * CELL-NAME   : mixer * VIEW        : schematic * SIMULATIONS : * TECHNO      : CMOS065 * TEMP. RANGE : *-------------------------------------------------------------------- *          Options *-------------------------------------------------------------------- .OPTION XA = 6.250000e-07 NOASCII STVER GEAR EPS=1e-6 OPTYP=2 NOPROBEOP GRAMP=9 nowarn=240 nowarn=902 *-------------------------------------------------------------------- *    Netlist Inclusion *-------------------------------------------------------------------- .include ./eldoD/schematic/netlist/netlist *-------------------------------------------------------------------- *    Corner Inclusion *-------------------------------------------------------------------- .include ./eldoD/schematic/netlist/corners #com .include process_alter .step param vdd list 1.35 1.65 .temp -40 125 #endcom *-------------------------------------------------------------------- *       Supply *-------------------------------------------------------------------- .param  Vdd =1.2 .param  V_OL=0 .param  Freq_OL = 50G .param  Freq_RF = 60G .param  PI=3.1415926535897932384626433832795 *-----------Matching-----------* .param  Lg =  61p   .param  Ls = 30p     .param  Lg_OL = 553p *------------------------------* *-----------Filtre DC----------* .param  Cc1=10p .param  Cc2=20p *------------------------------* *-----------Filtre IF----------* .param  C_OL=4f .param  L_OL=2.53n .param  L_FI = 10n *------------------------------* Vvplus   Vdd     0   DC  Vdd Vvminus  vminus  0   DC   0   .param P_RF=-20 .param P_OL= 0 .param  Spacing = 2Meg RL  IF  vminus   50 *-------------------------------------------------------------------- *      Stimuli *-------------------------------------------------------------------- .temp 25 *-------------------------------------------------------------------- * Calcul de IM3 en utilisant PdBm *-------------------------------------------------------------------- VOL        OL        vminus    Rport=50     FOUR     fund3            MA                      (1)  0.10   -90   !(0)   0.8    0   (1)    0.22   -90 VRF        RF        vminus    Rport=50     FOUR     fund1    fund2   PdBm  (1,0)  P_RF  -90 (0,1)   P_RF   -90 *-------------------------------------------------------------------- *-------------------------------------------------------------------- *  Simulation commands *-------------------------------------------------------------------- .probe V !.step param P_RF -35 0 0.5 *-------------------------------------------------------------------- * Steady-State analysis definition *-------------------------------------------------------------------- .sst fund1={Freq_RF+{Spacing/2] nharm1=4 fund2={Freq_RF-{Spacing/2] nharm2=4  fund3=Freq_OL nharm3=4 .option sst_max_liniter=100   .option sst_spectrum=1 *-------------------------------------------------------------------- *plot *-------------------------------------------------------------------- .plot fsst vdb(RF) .plot fsst vdb(IF,vminus) .plot fsst Pdbm(VRF) .plot fsst Pdbm(RL) .plot tsst v(IF,vminus) *-------------------------------------------------------------------- * definition of the third intermodulation *-------------------------------------------------------------------- .extract fsst label=IM3 (yval(PdBm(RL), fund1-fund3) - yval(PdBm(RL), {2*fund1-fund2-fund3})) .extract fsst label=IIP3 0.5*meas(IM3) + P_RF .extract fsst label=OIP3 0.5*meas(IM3) + yval(PdBm(RL),{fund1-fund3}) *-------------------------------------------------------------------- * definition of the third order intercept point *-------------------------------------------------------------------- .extract FSST label=P1 yval(PdBm(RL), {fund1-fund3}) .extract FSST label=P3 yval(PdBm(RL), {2*fund1-fund2-fund3}) .extract FSST label=BIS_IM3 {meas(P1) - meas(P3)} .extract FSST label=BIS_IIP3 {meas(IM3)/2 + P_RF} .extract FSST label=BIS_OIP3 {meas(P1) + meas(IM3)/2} #com *-------------------------------------------------------------------- * functions for direct IIP3-OIP3 extracts *-------------------------------------------------------------------- .extract fsst label=IIP3_ref  iipx( PdBm(VRF), PdBm(RL), {fund1-fund3},{2*fund1-fund2-fund3} ) .extract fsst label=OIP3_ref  oipx( PdBm(RL) ,           {fund1-fund3},{2*fund1-fund2-fund3} ) .extract fsst label=IIP3_ref_bis  iipx( vdb(RF), PdBm(RL), {fund1-fund3},{2*fund1-fund2-fund3} ) #endcom thank you for you

The Designer's Guide Community Forum » Powered by YaBB 2.2.2! YaBB © 2000-2008. All Rights Reserved.