Research On Ultra-wideband Circuit Based On Memristor

As the fourth basic passive components, because of nanometer-sized, fast switching, low power consumption and other characteristics, memristors have been paid more and more attention and research. The combinational circuit of memristors and other passive components can produce the unconventional waveform. This paper takes the memristor suitable for high frequency as the object of study, the model and the device characteristics are researched. It is applied to the circuit of producing ultra-wideband signal.Firstly, the research status of memristor and ultra-wideband pulse generating circuit are introduced, the theory and the working mechanism of the memristor are described. The physical structure, conduction mechanism, manufacture techniques and mathematical models of tantalum oxide memristor are analyzed in detail. It is simulate with MATLAB software and the hysteresis curve of the memristor is obtained. And the SPICE model is built, the simulation also shows the memristor’s nonlinear characteristic.Secondly, The UWB signal generator based on the memristor is designed. The signal generator is simulated by MATLAB and SPICE software from two aspects of the behavioral level and circuit level. Simulation results:the output signals having a center frequency of 5 GHz both having a bandwidth of about 2 GHz.Finally, the composition of UWB signal generator includes a spiral inductor, a MIM capacitor, a thin-film resistor and transmission lines. Their high-frequency characteristics are analyzed. Then the on-chip inductor based on the signal generator is analyzed theoretically. A on-chip inductor is designed, which has L value of 5.7 nH, the maximum Q value of 13.3, the self-resonant frequency of 9.1 GHz with HFSS software. A MIM capacitor of 0.12pF and a thin-film resistor of 50Ω. based on the ideal signal generator are also designed. And the signal generator that contains parasitic is simulated, the result:the output signal having a center frequency of 5 GHz with a bandwidth of about 1.5 GHz. It is still ultra-wideband signal.