Memristor, the acronym of memory resistor, is a non-volatile memory element and relies on the relationship between the electric components charge, q and flux-linkage, ?. Although the history of devices exhibiting the memristive behavior dates back to more than two centuries but also it was first mathematically postulated in 1971 by Leon Chua as the fourth basic circuit element and later Chua and Kang extended the phenomenon of memristors to memristive system in 1978.
In 2008, a group of scientists from hp under the supervision of Stanley Williams claimed that they have found the Chua’s missing memristor based on an analysis of a thin film of titanium dioxide and the result was published in their seminal paper in Nature. However, the real world memristor circuit is currently under development by various teams including hp, SK Hynix and HRL Laboratories and so on. As memristor is commercially unavailable due to the cost and technical difficulties in fabricating nano-scale devices. Therefore, it is important to design an real-world applicable emulator circuit which can exploits the potentiality of memristor and can exhibits the behavioral phenomenon of memristors and memristive system such as zero-crossing and frequency-dependent pinched hysteresis loop.
Several research group presented memristor emulating circuit but Kim et al represented a comparatively effective analog memristor emulator based on the features of hp TiO2 memristor. However, the analog memristor emulator represented in Kim et al also contained several limitations as the emulating circuit depends on the power supply. Moreover, the memristance ratio was inadequate and had limitations on the basis of connectivity with other circuit elements.
In this thesis a CMOS based memristor emulator circuit is designed to overcome the shortcomings of the emulator presented in Kim et al. The modified CMOS based memristor emulator is also relies on the features of hp TiO2 memristor. This memristor emulator is highly compatible as real-world memristor emulating circuit as the CMOS circuit is smaller in size and power efficient than its predecessor. Moreover, the memristor emulator is independent of power supply and can work effectively in any types of power supply. The memristance ratio is comparable higher than the memristor emulator present in Kim et al. Furthermore, the memristor emulator is a 2 port device and can connect with other memristor serially or anti-serially as well as with the other circuit elements.