Abstract
A code non-invasive approach for the coupling of the 3D Maxwell equations in their FD-TD difference form to the PISCES device simulator has been developed. The algorithms are coupled through the standard PISCES input setup, which is reset every time step. The method requires the specification of a time dependent current drive to the device, in parallel with an effective capacitance that represents external displacement current effects. To do this, an effective parallel capacitance is simulated in the PISCES setup, by first setting the serial capacitance C, and then by changing the drive voltage impulsively each time step so that the time derivatives of the applied voltage V{sub app} are ignored. The V{sub app} is made very large relative to the potential at the device terminals, and R is continually adjusted to set the effective current V{sub app}/R to the desired drive value each cycle. The success of this procedure is demonstrated through calculations for a diode at the end of a microstrip transmission line. Comparison is made with simple analytic solutions at low frequency to avoid capacitive effects in the non-ideal PISCES diode.
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