FDTD analysis of active circuits with equivalent current source approach

The finite-difference time-domain (FDTD) method is a powerful electromagnetic wave simulator. Recently, it has been extended to include lumped device and active device to provide field simulations for microwave active circuits. For active circuits, the performance of the entire circuit depends dominantly on the active device. For accurate analysis, the interaction between the active device and electromagnetic field appears to be important in the simulation. In this paper, the implementation of the equivalent current sources in the FDTD method to model the interaction of three-terminal active devices and electromagnetic fields is investigated.