Development of CMOS Analog Memristor Emulator for Associative Learning and Neuromorphic Applications
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| Publicado en: | ProQuest Dissertations and Theses (2025) |
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| Acceso en línea: | Citation/Abstract Full Text - PDF |
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| Resumen: | In 1971, Leon Chua proposed the memristor as the fourth essential two-terminal passive circuit element, emphasizing the symmetry of basic circuit equations. This device's defining feature was the ability of its input voltage to modify the value of its instantaneous resistance, which is also a non-volatile quantity because it remains even after the input is removed from circuit. Nanoscale CMOS transistors are likely to reach a physical limit within the next decade. Beyond CMOS is a long-term objective of developing new nanoscale components with distinct functionality and dynamics. These include memristive devices, spintronics, molecular electronics, quantum computers, and conventional electronic components containing unique state variables such as resistance, photons, flux, and others. These research ideas are still being developed and cannot be quickly integrated into standard CMOS production procedures. It necessitates the research and development of novel devices that can surpass standard similar CMOS implementations. The memristor is one such gadget. Following the success of the memristor, Di Ventra, Pershin, and Chua expanded the concept of memory circuit components to capacitive and inductive systems, developing the memcapacitor and meminductor, respectively. Stanley Williams' research group at Hewlett-Packard (HP) in California is credited with developing the world's first memristor in 2008.Memristors have benefited analogue circuits, nonlinear circuits, sensors, control systems, storage systems, cellular neural networks, logic circuits, neuromorphic circuits, and a wide range of other applications. The initial step in implementing memristive properties in the aforementioned applications is to investigate memristive behavior using simulations. To do this, three main strategies are used: behavioral modeling, SPICE (Simulation Program with Integrated Circuit Emphasis) models, and emulation circuits. Smooth continuous cubic non-linear functions, square non-linear functions, piecewise linear models, and hyperbolic sine models were used to recreate the behavior of the Hewlett-Packard (HP) memristor. The second strategy involved creating SPICE models to represent the HP memristor. These techniques are particularly exciting because they use commercially available tools; nevertheless, there is one big disadvantage: they can only be used to numerically simulate memristor-based circuits. The literature has provided a range of emulation circuits, each with its own design, process and architecture. This approach proposes incremental and decremental grounded and floating memristor emulator circuits using op-amps and multipliers. Some other emulators, on the other hand, not only become sophisticated and complex, necessitating demanding operating conditions, but they also lack the memristive fingerprints that can be used to demonstrate that the proposed circuit is a memristor.Based on the foregoing considerations, every emulator circuit must have frequency-dependent pinched hysteresis loop characteristics that must cross the origin for any input signal that is periodic in nature irrespective of its amplitude, frequency and starting conditions. Circuits designed for emulating the behaviour of memristors are essential for studying and developing real-world applications, such as the ones described above. Therefore, several emulator circuits based on commercially available components have been elaborated to accurately simulate the real behaviour of memristors (MR), meminductors (MI), and memcapacitors (MC).The research work presented in this thesis concerns with the study and design of novel mem-elements emulator circuit and applications using CMOS Transistors, operational transconductance amplifier (OTA) as current mode (CM) analog building blocks (ABBs). The thesis contains seven Chapters, out of which research contributions of the author are provided in two Chapters. |
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| ISBN: | 9798315754527 |
| Fuente: | ProQuest Dissertations & Theses Global |