On Sunday 07 April 2013, Karl Hammar wrote: > I get different volt calculated vs. measured in node 2 of > simulation below. Can anyone point to where my mistake is? > > It should be 0.5 V for 50 Ohm input impedance but only > measures to less than 200 mV. Replacing circuit 50 Ohm BNC > terminator gives me the correct 500mV. > > My stuff is available in: > > http://turkos.aspodata.se/git/openhw/rfid/
It works for me. My guess at where the mistake is .. something you haven't shown us. >From your batch file ... #Freq I(L) V(2) 12.5E+6 0.023063 0.030071 12.51E+6 0.023253 0.031361 ..... 13.55E+6 0.073021 0.49164 13.56E+6 0.073039 0.49553 13.57E+6 0.072994 0.49898 13.58E+6 0.072886 0.50198 13.59E+6 0.072715 0.50454 13.6E+6 0.072482 0.50665 13.61E+6 0.07219 0.50831 13.62E+6 0.071839 0.50953 13.63E+6 0.071434 0.51032 13.64E+6 0.070975 0.51068 13.65E+6 0.070468 0.51063 13.66E+6 0.069913 0.5102 13.67E+6 0.069317 0.50939 13.68E+6 0.06868 0.50822 13.69E+6 0.068009 0.50673 13.7E+6 0.067305 0.50492 13.71E+6 0.066573 0.50283 13.72E+6 0.065816 0.50047 I also ran some interactive tests. Gnucap 2009.12.07 RCS 26.136 ..... gnucap> spice gnucap-spice>C1a 2 4 7.39e-10 gnucap-spice>C1b 0 3 7.39e-10 gnucap-spice>C2 2 0 1.65e-09 gnucap-spice>Cpar 4 3 1e-11 gnucap-spice>L 4 3 4.4e-07 gnucap-spice>Rpar 4 3 1500 gnucap-spice>.print ac z(2) zp(2) zr(2) zi(2) gnucap-spice>.ac 12meg 14meg 10k #Freq z(2) zp(2) zr(2) zi(2) 12.Meg 1.6451 -72.192 0.50313 -1.5663 12.01Meg 1.6104 -71.54 0.50991 -1.5275 ..... 12.28Meg 0.81418 -21.71 0.75642 -0.30118 12.29Meg 0.80752 -17.859 0.76861 -0.24764 12.3Meg 0.80467 -13.907 0.78108 -0.1934 12.31Meg 0.80583 -9.8929 0.79384 -0.13845 12.32Meg 0.81114 -5.8555 0.80691 -0.082753 12.33Meg 0.82071 -1.8369 0.82028 -0.026307 12.34Meg 0.83455 2.1224 0.83398 0.030907 12.35Meg 0.85266 5.9852 0.84801 0.088909 ..... 13.55Meg 48.258 5.1804 48.061 4.3574 13.56Meg 49.099 1.9652 49.07 1.6837 13.57Meg 49.789 -1.3062 49.776 -1.135 13.58Meg 50.316 -4.6125 50.153 -4.0463 13.59Meg 50.671 -7.9309 50.187 -6.9915 13.6Meg 50.85 -11.238 49.875 -9.9101 13.61Meg 50.855 -14.512 49.233 -12.743 13.62Meg 50.694 -17.73 48.286 -15.438 13.63Meg 50.376 -20.874 47.069 -17.95 13.64Meg 49.917 -23.928 45.627 -20.246 13.65Meg 49.335 -26.877 44.006 -22.303 13.66Meg 48.648 -29.712 42.252 -24.112 ..... gnucap-spice>r0 1 2 50 gnucap-spice>V1 1 0 generator(1) ac 1 gnucap-spice>.print ac v(2) vp(2) vr(2) vi(2) gnucap-spice>.ac #Freq v(2) vp(2) vr(2) vi(2) 12.Meg 0.032559 -70.415 0.010914 -0.030675 12.01Meg 0.031868 -69.808 0.011 -0.02991 ..... 12.28Meg 0.016041 -21.37 0.014938 -0.0058451 12.29Meg 0.015906 -17.579 0.015163 -0.0048039 12.3Meg 0.015846 -13.689 0.015396 -0.0037499 12.31Meg 0.015865 -9.7367 0.015636 -0.002683 12.32Meg 0.015965 -5.7622 0.015884 -0.0016029 12.33Meg 0.016149 -1.8072 0.016141 -509.29u 12.34Meg 0.016417 2.0876 0.016406 598.03u 12.35Meg 0.016769 5.8851 0.01668 0.0017193 ..... 13.55Meg 0.49164 2.6362 0.49112 0.022612 13.56Meg 0.49553 0.99154 0.49545 0.0085749 13.57Meg 0.49898 -0.6545 0.49894 -0.0056998 13.58Meg 0.50198 -2.299 0.50158 -0.020137 13.59Meg 0.50454 -3.939 0.50335 -0.034659 13.6Meg 0.50665 -5.5716 0.50426 -0.04919 13.61Meg 0.50831 -7.194 0.50431 -0.063655 13.62Meg 0.50953 -8.8035 0.50353 -0.077982 13.63Meg 0.51032 -10.398 0.50194 -0.092101 13.64Meg 0.51068 -11.974 0.49957 -0.10595 13.65Meg 0.51063 -13.53 0.49646 -0.11947 13.66Meg 0.5102 -15.064 0.49266 -0.1326 ..... It's interesting that zero-phase occurs at a different frequency than max voltage or max impedance. Your use of the "generator" keyword is probably not what you want, but that is not the problem here. Since you specified an AC value, it overrides the "generator" making it apply only to transient analysis. _______________________________________________ Help-gnucap mailing list [email protected] https://lists.gnu.org/mailman/listinfo/help-gnucap
