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Related Concept Videos

MOS Capacitor01:25

MOS Capacitor

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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...
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MOSFET01:16

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The Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET) plays a pivotal role in modern electronics thanks to its versatility and efficiency in controlling electrical currents. This device, also known as IGFET, MISFET, and MOSFET, has three main terminals: the Source, Drain, and Gate. MOSFETs are classified into n-channel or p-channel types based on the doping characteristics of their substrate and the source or drain regions.
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Characteristics of MOSFET01:17

Characteristics of MOSFET

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Metal-oxide-semiconductor field-effect Transistors, or MOSFETs, play a critical role in electronic circuits. They are primarily utilized for amplifying and switching signals.
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MOSFET: Depletion Mode01:20

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Depletion-mode MOSFETs represent a unique subset of MOSFET technology, functioning fundamentally differently from their enhancement-mode counterparts. Unlike enhancement MOSFETs, which require a positive gate-source voltage (Vgs) to turn on, depletion-mode MOSFETs are inherently conductive and "normally on" devices.
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MOSFET: Enhancement Mode01:22

MOSFET: Enhancement Mode

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Enhancement-mode MOSFETs are pivotal components in electronics, distinguished by their capacity to act as highly efficient switches. They are part of the larger family of metal-oxide Semiconductor Field-Effect Transistors (MOSFETs). They are available in two types: p-channel and n-channel, each tailored to specific polarity operations.
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Equivalent Capacitance01:19

Equivalent Capacitance

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From the study of resistive circuits, it is understood that employing a series-parallel combination serves as an effective strategy for simplifying circuits. Capacitors can be arranged within a circuit in one of two ways: a series configuration or a parallel configuration. The way these capacitors are connected to a battery will influence both the potential drop across each individual capacitor and the size of the charge that each capacitor can store. This is determined by the specific type of...
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In Situ Transmission Electron Microscopy with Biasing and Fabrication of Asymmetric Crossbars Based on Mixed-Phased a-VOx
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A Fast-Transient-Response NMOS LDO with Wide Load-Capacitance Range for Cross-Point Memory.

Luchang He1,2, Xi Li2, Siqiu Xu2

  • 1School of Microelectronics, University of Science and Technology of China, Hefei 230026, China.

Sensors (Basel, Switzerland)
|December 11, 2022
PubMed
Summary
This summary is machine-generated.

A novel NMOS low-dropout regulator (LDO) offers stable V/2 read bias for cross-point memory. This fast-transient design ensures reliable performance across wide load variations and capacitor-less conditions.

Keywords:
cross-point memoryfast transient responseflipped voltage amplifierload capacitancelow-dropout regulator

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Area of Science:

  • Integrated Circuit Design
  • Semiconductor Devices
  • Memory Technology

Background:

  • Cross-point memory arrays require precise voltage biasing for reliable read operations.
  • Traditional low-dropout regulators (LDOs) may struggle with the dynamic load requirements of advanced memory systems.
  • Optimizing transient response and stability across diverse operating conditions is crucial for memory performance.

Purpose of the Study:

  • To develop a fast-transient-response NMOS LDO for V/2 read bias in cross-point memory.
  • To ensure regulator stability and performance across a wide range of load capacitances and equivalent series resistance (ESR) conditions.
  • To achieve high efficiency and a low figure-of-merit (FOM) for power-sensitive memory applications.

Main Methods:

  • Implementation of a flipped voltage amplifier (FVA) topology within the LDO control loop for enhanced transient speed.
  • Design and simulation in a 110 nm CMOS process.
  • Evaluation of stability, transient response (undershoot, settling time), unity-gain bandwidth (UGB), quiescent current, and current efficiency under various load conditions (0-10 nF capacitance, ESR, 0-100 mA load steps).

Main Results:

  • Stable operation achieved for load capacitances from 0 to 10 nF and under ESR conditions.
  • Unity-gain bandwidth (UGB) of approximately 400 MHz at full load in capacitor-less mode.
  • For a 0-10 mA load step (10 ps edge), undershoot was 144 mV and settling time was 50 ns.
  • With a 1 µF capacitor, a load step from 0-100 mA (10 ps edge) resulted in 20 mV undershoot and 800 ns settling time.
  • Remarkable figure-of-merit (FOM) of 1.01 mV and low quiescent current of 70 µA.
  • High current efficiency of 99.992% achieved at full load with ESR conditions.

Conclusions:

  • The FVA-based NMOS LDO effectively provides a stable V/2 read bias for cross-point memory.
  • The design demonstrates excellent transient response and stability over a wide range of load conditions, including capacitor-less operation.
  • Achieved performance metrics, including high efficiency and low quiescent current, make it suitable for demanding memory applications.