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Precisely synchronous and cascadable multi-channel arbitrary waveform generator.

Ke Liu1, Shulin Tian1, Guangkun Guo1

  • 1School of Automation Engineering, University of Electronic Science and Technology of China, Chengdu 611731, China.

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Summary
This summary is machine-generated.

This study presents a novel synchronization structure for high-speed arbitrary waveform generators (AWGs) using a multi-memory paralleled direct digital synthesizer (DDS). The design ensures precise phase alignment for multi-channel analog outputs, crucial for advanced signal generation.

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Area of Science:

  • Electrical Engineering
  • Signal Processing
  • Instrumentation

Background:

  • Arbitrary waveform generators (AWGs) require high output bandwidth and precise phase synchronization for multi-channel analog outputs.
  • Existing multi-memory paralleled direct digital synthesizer (DDS) structures for AWGs face synchronization challenges.
  • Accurate relative phase adjustment is critical for applications like quadrature modulators.

Purpose of the Study:

  • To propose and validate a novel synchronization structure for multi-channel high-speed AWGs.
  • To overcome the limitations of existing DDS architectures in achieving precise output synchronization.
  • To enable the generation of complex waveforms with accurate phase control.

Main Methods:

  • Developed a synchronization structure for multi-channel AWGs utilizing a multi-memory paralleled DDS.
  • Implemented careful distribution of clock and trigger signals to eliminate random initial phase.
  • Designed an embedded clock synchronization calibration module to mitigate phase differences from digital-to-analog converters.

Main Results:

  • Designed and implemented a four-channel, 600 MS/s AWG.
  • Achieved a 240 MHz output bandwidth and 16 MSa storage depth.
  • Demonstrated inter-channel initial skew accuracy < 150 ps and phase resolution of 0.0001°.
  • Showcased capability for generating I/Q signals and cascading for more channels with < 1.6 ns inter-channel skew.

Conclusions:

  • The proposed synchronization structure effectively addresses phase alignment issues in high-speed multi-channel AWGs.
  • The developed AWG meets stringent specifications for applications requiring precise multi-channel analog signal generation.
  • The architecture supports scalability for systems needing numerous synchronized output channels.