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Related Concept Videos

Design Example: Capacitance Multiplier Circuit01:20

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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Related Experiment Video

Updated: May 23, 2026

Fabrication of Three-Dimensional Graphene-Based Polyhedrons via Origami-Like Self-Folding
14:52

Fabrication of Three-Dimensional Graphene-Based Polyhedrons via Origami-Like Self-Folding

Published on: September 23, 2018

Graphene-based frequency tripler.

Hong-Yan Chen1, Joerg Appenzeller

  • 1School of Electrical and Computer Engineering and Birck Nanotechnology Center, Purdue University, West Lafayette, Indiana 47907, USA. chen200@purdue.edu

Nano Letters
|March 29, 2012
PubMed
Summary
This summary is machine-generated.

Researchers developed a graphene frequency tripler, overcoming the material's lack of a bandgap. This novel device utilizes electrostatic doping to harness graphene's unique ambipolar properties for electronic applications.

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Fabrication of Gate-tunable Graphene Devices for Scanning Tunneling Microscopy Studies with Coulomb Impurities
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Fabrication of Gate-tunable Graphene Devices for Scanning Tunneling Microscopy Studies with Coulomb Impurities

Published on: July 24, 2015

Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Electrical Engineering

Background:

  • Graphene is a 2D material with exceptional electrical transport properties.
  • High electron and hole mobility make it suitable for high-performance electronic channels.
  • Graphene's lack of a bandgap leads to ambipolar characteristics and no device off-state, posing challenges for conventional electronics.

Purpose of the Study:

  • To address the challenge of utilizing graphene's electronic properties despite its lack of a bandgap.
  • To propose a novel device concept that exploits graphene's unique characteristics.
  • To demonstrate a graphene-based frequency tripler.

Main Methods:

  • Development of a novel device architecture for a graphene-based frequency tripler.
  • Implementation of an innovative electrostatic doping approach.
  • Exploitation of graphene's intrinsic ambipolar behavior.

Main Results:

  • Successful demonstration of a graphene-based frequency tripler.
  • Validation of the electrostatic doping approach for controlling graphene's electronic properties.
  • Effective utilization of graphene's ambipolar behavior in a functional electronic device.

Conclusions:

  • The proposed device overcomes the limitations of graphene's zero bandgap for electronic applications.
  • Electrostatic doping offers a viable method to harness graphene's superior electronic properties.
  • Graphene-based frequency triplers represent a promising new direction for high-performance electronic devices.