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Related Experiment Videos

Polarization-switching D/A converter.

Shunming Sun1, Thottam S Kalkur

  • 1Department of Electrical and Computer Engineering, University of Colorado at Colorado Springs, Colorado Springs, CO 80933-7150, USA.

IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
|July 29, 2005
PubMed
Summary

This study introduces a new digital-to-analog (D/A) conversion method using polarization. Ferroelectric capacitors offer advantages over CMOS capacitors for this novel polarization-switching digital-to-analog converter (PDAC) technology.

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Area of Science:

  • Electrical Engineering
  • Materials Science
  • Semiconductor Devices

Background:

  • Traditional digital-to-analog (D/A) converters face limitations in performance and integration.
  • Ferroelectric materials offer unique properties like spontaneous polarization and high dielectric constants.
  • Nonlinearity in charge-voltage behavior is crucial for advanced capacitor applications.

Purpose of the Study:

  • To present a novel D/A conversion technique utilizing polarization as the conversion medium.
  • To explore the implementation of this technique using both CMOS and ferroelectric capacitors.
  • To evaluate the performance of a polarization-switching digital-to-analog converter (PDAC) architecture.

Main Methods:

  • Developed a novel digital-to-analog conversion technique based on polarization.

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  • Implemented the polarization-switching digital-to-analog converter (PDAC) architecture.
  • Fabricated and tested two 9-bit bipolar PDAC prototypes: one using CMOS capacitors and another using ferroelectric capacitors.

    • Main Results:

    • Ferroelectric capacitors demonstrated significantly larger effective capacitance compared to CMOS capacitors.
    • Ferroelectric-based PDACs showed reduced influence from bottom-electrode parasitic capacitance.
    • The ferroelectric PDAC exhibited potential for nonvolatile memory function due to hysteresis.

    Conclusions:

    • Polarization-based D/A conversion is a viable technique, particularly with ferroelectric materials.
    • Ferroelectric capacitors offer superior performance characteristics for PDACs.
    • The proposed PDAC architecture and its implementations show promise for advanced data conversion and memory applications.