||With advances in technology, the signal processing speed of digital electronic products are faster and faster. The conventional single-ended transmission line structure has been unable to meet the needs of high-speed transmission. Since the differential transmission line structure has the advantage of anti-interference and low propagation voltage, it is suitable for the needs of high-speed transmission, and is widely used in digital electronics products. Therefore, the main purposes of this thesis are developing the measurement theory and calculating the equivalent circuit parameters by a self-developed software for the differential transmission line.
In this thesis, first, we introduce how important about constructing the equivalent circuit model of interconnections. Then, we introduce what the commercial software which is for constructing the equivalent circuit model. In chapter two, we present the basic time-domain concepts and theories about the measurement technology. In chapter three, we develop the software for achieving theory calculation which is presented in chapter two. And we develop the user interface for simplifying the operation. In chapter four, we present three different types of DUT (device under test), and measure the impedance profiles of DUTs with Time Domain Reflectometry (TDR). According to the measurement theory which is proposed in the previous chapter, we develop the measurement technology and get the data. Then, we calculate the equivalent circuit parameters with the self-developed software. According to the theory, we propose the equivalent circuit model, and construct the equivalent circuit model and simulate the impedance profile in time domain with CST DESIGN STUDIO. Finally, we compare the simulation result with measurement result, and verify that the measurement theory and equivalent circuit model which are proposed by this work.