Modeling and Simulation of a Memristor-Based Sawtooth Signal Generator Using Nonlinear Dopant Drift Memristor Models

The new circuit element memristor is under inspection for new type of analogue applications. Memristors are already used in some oscillator circuits. Recently, it has been shown that a sawtooth signal generator with a memristor can be made using HP model of Ti02 memristor and its emulator. HP memristor model is obsolete now. In literature, there are ionic memristor models which uses window functions. In this paper, several well-known nonlinear drift memristor model’s usability to simulate such a sawtooth signal generator is examined. A nalysis of the sawtooth signal generator is done using five different models. It has been shown solving circuit equations that some of the models have closed form solutions and some of the solutions are invalid at the memristor boundaries (when the state variable is equal to zero or one). Biolek’s window function and a modified Biolek’s window function, Zha’s window function are found to be the most useful ones to model the memristor throughout its whole operation using simulations made in Matlab. Low and high frequency behavior of the signal generator is also shown