REALIZATION OF CDTA BASED INCREMNETAL/DECREMENTAL TYPE MEMRISTOR EMULATOR CIRCUIT

Abstract

Memristor is a fourth basic circuit element. It shows the relationship between charge (q) and flux (𝟇). Although memristor is a hypothetical concept, its realization is important for interaction with other circuit element for designers. In this project, a new memristor emulator circuit has been designed using Current Differencing Transconductance Amplifier (CDTA) block. The CDTA block consists of two units: (1) Current Differencing Unit (CDU) and (2) Transconductance Amplifier (TA) unit. The TA unit of CDTA block offers an extra control parameter, transconductance parameter (gm) in addition to frequency (f) and amplitude value of voltage across emulator (Vm). Since, gm can be controlled using external voltage/current, the memductance of proposed emulator circuit can be tuned electronically. The proposed emulator circuit provides both type of memductance, incremental and decremental, solely by interchanging the CDTA output terminals controlled by simple switch. The realization of proposed emulator circuit is simple in comparison to the existing emulator circuits and avoids the use of extra circuitry like ADC, DAC, analog multiplier and multiple sub-circuits. The proposed emulator circuit consists of one CDTA block, two resistors and one capacitor. In order to test the functionality of the proposed emulator circuit, a passive component has connected both ways, serial and parallel, than MC circuit is analyzed and results have been included in the end of the report. The simulations have done using SYMICA DE software and technology used is TSMC 250nm.