Takemi Watanabe

Dynamic C-V Characteristic for Simulation of Crosstalk Caused by a Varactor Load

In this paper, crosstalk analysis of parallel microstrip lines with a varactor load is described. The varactor load has a transition characteristic. The transition characteristic causes a complicated reflected wave. It is difficult to estimate crosstalk induced by the reflected wave accurately. To estimate the crosstalk, the transition characteristic is investigated. The transition characteristic is expressed as the dynamic C-V characteristic. The crosstalk is simulated using the dynamic C-V characteristic. The result of the simulation agrees with the measured crosstalk. This agreement shows that the dynamic C-V characteristic is effective to estimate crosstalk.

Simulation of reflected voltages using V-Q characteristic of a load for crosstalk simulation

In this paper, a new simulation method for crosstalk simulation is described. To simulate the crosstalk accurately, accurate simulation of reflected voltages from loads is required. The authors have studied the simulation method of reflected voltages using a dynamic C-V characteristic. However, this method has a problem that the procedure of calculation becomes complicated. This paper proposes a new simulation method using V-Q characteristic. The proposed method reduces the amount of calculation for the simulation. The simulation accuracy is little lowered though the amount of calculation is much reduced.

Equivalent transition capacitance of a nonlinear devise connected with a transmission line for crosstalk analysis

In crosstalk analysis, reflection of a load connected with terminating a transmission line is important. In order to investigate behavior of the reflection, we measured the reflected and the input voltages for the load, and estimated equivalent transition capacitances that explain a relation between the input and the reflected voltages. This paper reports an experimental method to extract reflected voltages at a varactor load and estimated results of the equivalent transition capacitance of the load. It is shown that the reflected voltages simulated using the equivalent capacitance agree with the measured results.