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Biasing of FET01:22

Biasing of FET

332
Biasing a Junction Field Effect Transistor (JFET) is crucial for setting operational parameters and ensuring efficient functioning in electronic circuits. JFETs are characterized by using a single carrier type in N-channel or P-channel configurations, where the channel is surrounded by PN junctions. These junctions are central to the device's ability to control current flow.
In an N-channel JFET, the structure consists of N-type material forming the channel on a P-type substrate, with the...
332
MOSFET: Enhancement Mode01:22

MOSFET: Enhancement Mode

402
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.
In their basic form, enhancement-mode MOSFETs are typically non-conductive when the gate-source voltage (Vgs) is zero. This default 'off' state means no...
402
MOSFET: Depletion Mode01:20

MOSFET: Depletion Mode

415
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.
The primary characteristic of depletion-mode MOSFETs is their ability to conduct current between the drain and source terminals without gate bias. This inherent conductivity...
415
MOS Capacitor01:25

MOS Capacitor

869
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...
869
Biasing of P-N Junction01:16

Biasing of P-N Junction

631
The operation of a p-n junction diode involves various biasing conditions, including forward bias, reverse bias, and equilibrium.
In equilibrium, no external voltage is applied across the p-n junction. The depletion region is formed at the junction interface due to the diffusion of carriers, which leaves behind charged dopants, acceptors on the p-side, and donors on the n-side. These immobile charges create an electric field that prevents further diffusion of carriers. The related energy band...
631
Design Example: Capacitance Multiplier Circuit01:20

Design Example: Capacitance Multiplier Circuit

850
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.
850

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Related Experiment Video

Updated: Jul 30, 2025

Experimental Methods for Trapping Ions Using Microfabricated Surface Ion Traps
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Experimental Methods for Trapping Ions Using Microfabricated Surface Ion Traps

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Investigation of Program Efficiency Overshoot in 3D Vertical Channel NAND Flash with Randomly Distributed Traps.

Chanyang Park1, Jun-Sik Yoon1, Kihoon Nam1

  • 1Department of Electrical Engineering, Pohang University of Science and Technology (POSTECH), Pohang 37673, Republic of Korea.

Nanomaterials (Basel, Switzerland)
|May 13, 2023
PubMed
Summary

Investigating incremental step pulse programming slope (ISPP) in 3D NAND flash memory revealed that random variations and excessive tunneling cause programming overshoot and threshold voltage broadening. Understanding these issues is key for reliable multi-bit storage.

Keywords:
3D NAND flashMonte−Carlo simulationabnormal program cellcharge trap nitrideincremental step pulse programmingovershootover−programmingprogram efficiency

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Area of Science:

  • * Solid-state device physics
  • * Semiconductor memory technology
  • * Nanoscale device characterization

Background:

  • * Three-dimensional (3D) NAND flash memory utilizes vertical nanowire channels for increased density.
  • * Incremental Step Pulse Programming (ISPP) is a technique for storing multiple bits per cell.
  • * Random variations in programming can lead to abnormal cell behavior and data errors.

Purpose of the Study:

  • * To investigate the origins of random variations in ISPP for 3D NAND flash memory.
  • * To analyze the impact of excessive tunneling and abnormal programming on cell characteristics.
  • * To clarify the physical mechanisms behind over-programming and threshold voltage distribution widening.

Main Methods:

  • * Experimental measurement of numerous 3D NAND flash memory cells using ISPP.
  • * Distinguishing between read variation and over-programming during cell analysis.
  • * 3D Monte-Carlo simulation to model randomness and identify physical origins of over-programming.

Main Results:

  • * Excessive tunneling from the channel to the storage layer was identified as a cause of program efficiency overshoot.
  • * Abnormal program cells lead to a broadening of the threshold voltage distribution.
  • * 3D Monte-Carlo simulations revealed that program step voltage and randomly distributed trap sites in the nitride are key contributors to over-programming.

Conclusions:

  • * The study quantitatively analyzed the concurrent effects of program step voltage and trap site distribution on ISPP variations.
  • * Findings elucidate the origins of variation and overshoot in ISPP, particularly concerning randomly located nanoscale traps.
  • * Enhanced understanding of random over-programming can help mitigate obstacles for multi-bit storage techniques in 3D NAND flash memory.