Resistorless Memristor Emulator Using CFTA and Its Experimental Verification

Abstract

This article presents a novel charge-controlled memristor emulator circuit. The proposed memristor emulator utilizes a single Current Follower Transconductance Amplifier (CFTA) as an active current mode analog building block and a grounded capacitor as a passive element. The circuit presented follows all the fingerprints of an ideal memristor. It operates in both incremental as well as decremental mode. The functional performance of the emulator circuit is verified at different operating frequencies and performs well up to 9 MHz. The theoretical and non-ideal analyses are verified for the proposed emulator. Moreover, Monte Carlo sampling and non-volatility analysis are performed to investigate the robustness of the emulator circuit. The functionality of the proposed model has been verified through PSPICE simulation using TSMC 0.18 μm CMOS technology at the supply voltage of ±1.2 V. The experimental confirmation of the presented circuit is also performed by building a breadboard micromodel using ICs CA3080 and AD844AN. Memristor based Chua's circuit model is included as one of its applications.

Low-Power VDBA based Grounded and Floating Memristor Emulators

“…4) Supply voltage is much higher in [9]- [22]. 5) The suggested memristor emulators can simulate both grounded and floating memristors, whereas those reported in [9], [10], [12], [13], [15]- [18], [20]- [22] can only simulate grounded or floating memristors. 6) The memristor emulators in the earlier version [9], [12], [13], [16], [18], [21], [22] use resistors while the proposed memristor emulators do not employ resistors.…”

New Zero Power Memristor Emulator Model and Its Application in Memristive Neural Computation

“…The design in [9,10] adopted a similar current mode block i.e., VDTA (Voltage Differencing Transconduc-tance Amplifiers) to implement memristor emulators with 50MHz as the maximum operating frequency for both works. Prasad and his team modeled a resistor-less memristor emulator [11] using a single CFTA (Current Follower Transconductance Amplifier) block. Kanyal et al [12] investigated a high-frequency memristor emulator with the help of OTA, operating up to 8MHz.…”

Design of a CMOS memristor emulator-based, self-adaptive spiking analog-to-digital data conversion as the lowest level of a self-x hierarchy

“…There are several challenges to implementing the SNN inspired by biological neural sensors systems based on memristor as a synapse, such as reliability, compatibility with CMOS technology, the fabrication complexity of memristor systems, the lifetime of memristor devices, the finite number of resistance levels, and resistance level stability (Krestinskaya et al, 2019;Zhang et al, 2020). Therefore, one more class of researchers have focused on memristor emulators to implement memristor SNN architectures on contemporary chips (Babacan et al, 2017;Cao and Wang, 2021;Kanyal et al, 2018;Prasad et al, 2021;Sánchez-López et al, 2014;Yadav et al, 2021;König, 2020, 2021b). Compared to the CMOS-based memristor, the material-based type offers more advantages beyond Moore technology to support a much more compact design and less power consumption.…”

“…Additionally, Kanyal et al (2018) proposed a memristor circuit utilizing two operational transconductance amplifiers (OTA) and one capacitor. Similarly, in Prasad et al (2021), they proposed a memristor circuit built with a Z-copy current follower transconductance amplifier (ZC-CFTA) and capacitor. Likewise, Sánchez-López et al (2014) proposed a memristor emulator with a single multiplier and four second generation current conveyors (CCII).…”