Simulate surface acoustic wave devices using VHDL-AMS

Network analyzer is the main instrument to measure SAW (surface acoustic wave) devices. Many research workers are familiar with the results coming from network analyzer. From this kind of results we can easily analyze the devices and select which meets the requirement of the design. In this paper, a way was proposed to simulate SAW devices using VHDL-AMS to get results similar to those measured by network analyzer. This way made it easy to design SAW devices by computer. Only changing some parameters, you can get the results before a SAW device is manufactured. It is also extendible for the system level computer-aided simulation containing SAW. As an example, we used three models of SAW devices to simulate a SAW filter on ST-X quartz. These three models are crossed-field model, modified crossed-field model and network model. The software used in simulation is ADVance MS (mentor graphics). In order to conquer the shortage of the VHDL-AMS, Foster's reactance theorem was used. The results were compared with the results measured by network analyzer. It shows that the simulation of network model is closer to that of measurement, in which the parameters were calculated by FEM.