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Related Concept Videos

Oscillations In An LC Circuit01:30

Oscillations In An LC Circuit

An idealized LC circuit of zero resistance can oscillate without any source of emf by shifting the energy stored in the circuit between the electric and magnetic fields. In such an LC circuit, if the capacitor contains a charge q before the switch is closed, then all the energy of the circuit is initially stored in the electric field of the capacitor. This energy is given by

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Gigahertz integrated graphene ring oscillators.

Erica Guerriero1, Laura Polloni, Massimiliano Bianchi

  • 1L-NESS, Department of Physics, Politecnico di Milano, Polo di Como, Via Anzani 42, 22100 Como, Italy.

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|May 30, 2013
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Summary
This summary is machine-generated.

Integrated graphene ring oscillators achieve record speeds for low-dimensional nanomaterials. These graphene oscillators demonstrate high performance, paving the way for advanced digital and analog electronic circuits.

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Area of Science:

  • Materials Science
  • Electrical Engineering
  • Nanotechnology

Background:

  • Ring oscillators (ROs) are crucial for assessing digital technology performance limits.
  • Existing ROs using low-dimensional nanomaterials show limited performance due to low current drive and large parasitics.

Purpose of the Study:

  • To demonstrate integrated ring oscillators fabricated from wafer-scale graphene.
  • To evaluate the performance of graphene-based ROs and their potential in electronic circuits.

Main Methods:

  • Fabrication of integrated ROs using graphene grown by chemical vapor deposition.
  • Characterization of oscillation frequency and output voltage swing.
  • Demonstration of stand-alone graphene mixers for frequency conversion.

Main Results:

  • Achieved highest oscillation frequency of 1.28 GHz and output voltage swing of 0.57 V.
  • Graphene ROs exhibit the fastest performance among low-dimensional nanomaterials and are robust against supply voltage fluctuations.
  • Successfully demonstrated the first integrated graphene oscillators and stand-alone graphene mixers.

Conclusions:

  • Parasitic capacitances, not intrinsic graphene properties, limit current RO performance, indicating potential for further enhancement.
  • These gigahertz graphene integrated circuits represent a significant advancement for high-speed digital and analog electronics.
  • Graphene oscillators offer a promising platform for applications where high operating speed can be balanced against power consumption.