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Parallel PWMs based fully digital transmitter with wide carrier frequency range.

Bo Zhou1, Kun Zhang, Wenbiao Zhou

  • 1School of Information and Electronics, Beijing Institute of Technology, Beijing 100081, China.

Thescientificworldjournal
|November 14, 2013
PubMed
Summary

New carrier-frequency (CF) and intermediate-frequency (IF) pulse-width modulators (PWMs) offer a fully digital transmitter with unit-delay autocalibration. This design achieves wide frequency range, high power efficiency, and low error vector magnitude (EVM).

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Area of Science:

  • Electrical Engineering
  • Signal Processing
  • Integrated Circuit Design

Background:

  • Pulse-width modulators (PWMs) are crucial for digital signal transmission.
  • Existing designs face limitations in reconfiguration, power efficiency, and signal purity.

Purpose of the Study:

  • To propose novel carrier-frequency (CF) and intermediate-frequency (IF) PWMs for enhanced digital transmitter performance.
  • To implement a fully digital transmitter with unit-delay autocalibration for high reconfiguration.

Main Methods:

  • Development of delay-line-based CF and IF PWM architectures.
  • Combination of IF-PWM and precorrected CF-PWM for transmitter implementation.
  • Utilizing 180 nm CMOS technology for high reconfiguration.

Main Results:

  • Achieved a wide CF range from 2 MHz to 1 GHz.
  • Demonstrated high power efficiency of 70%.
  • Obtained a low error vector magnitude (EVM) of 3% with 20 dB spectrum purity improvement.

Conclusions:

  • The proposed PWMs enable a highly reconfigurable, efficient, and accurate fully digital transmitter.
  • The architecture offers significant improvements in performance metrics compared to existing designs.
  • This work advances digital transmitter technology for various communication applications.