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MOS Capacitor

MOS Capacitor

A Metal-Oxide-Semiconductor (MOS) capacitor is a fundamental structure used extensively in semiconductor device technology, particularly in the fabrication of integrated circuits and MOSFETs (metal-oxide-semiconductor field-effect transistors). The MOS capacitor consists of three layers: a metal gate, a dielectric oxide, and a semiconductor substrate.
The metal gate is typically made from highly conductive materials such as aluminum or polysilicon. Beneath the metal gate lies a thin layer of...

Design Example: Capacitance Multiplier Circuit

Design Example: Capacitance Multiplier Circuit

In integrated circuit technology, a capacitance multiplier is often utilized to produce a larger capacitance value when a small physical capacitance falls short. This is achieved by a circuit that multiplies capacitance values by a factor of up to 1000, such that a 10-pF capacitor can replicate the performance of a 100-nF capacitor.
The circuit illustrated in Figure 1 below incorporates two op-amps, with the first operating as a voltage follower and the second acting as an inverting amplifier.

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Multi-Layer Molecular Quantum-Dot Cellular Automata Multiplexing Structure with Physical Verification for Secure

Jun-Cheol Jeon¹

¹Department of Convergence Science, Kongju National University, Gongju 32588, Republic of Korea.

International Journal of Molecular Sciences

|October 16, 2025

Summary

Molecular quantum-dot cellular automata (QCA) offer a nanoquantum solution for digital circuit design challenges. This study introduces an ultra-slim multi-layer multiplexer (Mux) with significant improvements in design costs.

Keywords:

molecular quantum-dot cellular automata multiplexer nanotechnology physical verification random access memory

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Area of Science:

Nanotechnology
Quantum Computing
Molecular Electronics

Background:

Existing CMOS technology faces limitations in digital circuit design.
Molecular quantum-dot cellular automata (QCA) present a promising alternative due to small size, high speed, and low power consumption.
The field is advancing towards a nanoquantum environment, necessitating novel circuit designs.

Purpose of the Study:

To propose an ultra-slim vertical panel type multi-layer 2-to-1 multiplexer (Mux) using molecular QCA.
To demonstrate the expansion of this design to a 4-to-1 Mux and its application in D-latch and RAM cells.
To physically validate cell polarization phenomena and ensure secure RAM design through noise elimination.

Main Methods:

Development of a novel 5 × 5 × 1 ultra-slim vertical panel type multi-layer Mux architecture.
Physical modeling of cell polarization using potential energy, inter-electron distance, and cell positioning.
Simulation of circuit operation and performance using QCADesigner 2.0.3 and QCADesignerE.
Integration of noise elimination and output signal polarization for secure RAM design.

Main Results:

The proposed multi-layer 2-to-1 Mux demonstrates significant improvements in design costs, achieving at least 1473% and 277% enhancements.
Successful expansion to 4-to-1 Mux, D-latch, and RAM cell designs using the novel vertical panel format.
Physical validation of polarization phenomena, confirming the operational principles of molecular QCA cells.

Conclusions:

The proposed ultra-slim vertical panel multi-layer Mux design offers substantial advantages over conventional multi-layer Muxes.
Molecular QCA technology is a viable and efficient solution for future nanoquantum digital circuits.
The study provides a foundation for secure and high-performance molecular QCA-based memory and logic circuits.