Overshoot and Undershoot Control for Signal Generator

In this paper, properties of overshoot and undershoot as functions of circuit parameters are investigated. We establish transient analysis circuit model for the test conditions of signal generator, then analyze the overshoot and undershoot by this model, and point out they are mainly related to the distributed inductance, resistance, and the loading capacitance of circuits. Three comparative tests are designed to verify the above analysis. Finally, three kinds of solutions are derived. They are reducing the distributed inductance of lines, increasing the loading capacitance, and the resistance of lines. In which, the method of increasing resistance of lines, adding an appropriate resistance between signal generator port and a load, is the optimum solution, which is a trade-off between the overshoot peak voltage and the rise time. In addition, at the beginning of this paper, a brief introduction for the SOPC technique, the DDS technique, and the construction of signal generator by these two techniques is given.