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Related Experiment Video

Updated: Feb 22, 2026

Generation and Coherent Control of Pulsed Quantum Frequency Combs
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Note: A high-frequency signal generator based on direct digital synthesizer and field-programmable gate array.

Yuanbo Du1, Wenbing Li1, Yapeng Ge1

  • 1MOE Key Laboratory of Fundamental Physical Quantities Measurement, Hubei Key Laboratory of Gravitation and Quantum Physics, School of Physics, Huazhong University of Science and Technology, 1037 Luoyu Road, Wuhan 430074, People's Republic of China.

The Review of Scientific Instruments
|October 2, 2017
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Summary

A novel high-frequency signal generator using direct digital synthesis (DDS) and field-programmable gate array (FPGA) achieves 1.4 GHz output. This DDS-FPGA system offers high precision for atomic, molecular, and optical physics experiments.

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Area of Science:

  • Physics
  • Electrical Engineering
  • Signal Processing

Background:

  • High-frequency signal generation is crucial for precision measurements in advanced physics.
  • Existing methods may lack the required frequency resolution, phase stability, or speed.
  • Direct digital synthesis (DDS) and field-programmable gate arrays (FPGAs) offer potential for improved performance.

Purpose of the Study:

  • To develop and characterize a high-frequency signal generator utilizing DDS and FPGA technology.
  • To evaluate the performance metrics, including output frequency, resolution, phase noise, and time delay.
  • To demonstrate the applicability of the developed signal generator in driving precision experimental equipment.

Main Methods:

  • Implementation of a signal generator architecture combining a DDS chip controlled by an FPGA.
  • Characterization of the DDS output frequency range and resolution.
  • Measurement of phase noise at various output frequencies and offsets.
  • Assessment of the system's time delay and response time when driving an acousto-optic modulator.

Main Results:

  • The signal generator achieves a maximum output frequency of 1.4 GHz with a frequency resolution of 190 pHz.
  • Measured phase noise at 1.2 GHz is -65 dBc/Hz@1 Hz (including reference clock) and -82 dBc/Hz@1 Hz (intrinsic).
  • The DDS exhibits a time delay under 150 ns, contributing to a 24 ns rise time when driving an acousto-optic modulator.

Conclusions:

  • The developed DDS-FPGA signal generator meets stringent requirements for high-frequency precision applications.
  • Its high frequency, resolution, and low phase noise make it suitable for demanding experiments.
  • The system's performance is validated through its successful application in driving an acousto-optic modulator for precision measurements.