你撒下一粒善良的种_子， 会在暗中蔓延出一片灿烂的花海
分类： LINUX
2008-10-21 18:26:18
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| If the Q is too high the simulator static and dynamic accuracy settings simple damp any oscillation built up. The following settings should be used: 1. Force the trapezoid integration method. In this case the mapping from continous poles to discrete time poles is exact at the stability border. 2. Set maximum time step to < 1/100 of the expected oscillation period. Other wise the stepsize choosen by the simulator ignore simple the initial startup. 3. Set the accuracy between 10e-4 and 10e-6. The stepsize also depend on the static accuracy setting. The startup current source should be in the best case a random number with gaussian distribution and an variance equal to the integrated current noise spectral density over the hole frequency. The problem with realistic single pulse startup is that it inject into the tank less energy because only the very narrow frequency range with the tank Q receive startup energy. I have seen startup with noise source but not with single startup pulse for the same freqency spectrum and noise energy. I did not dive deeper there and it is more than a decade ago. | ||
