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A New Time Calibration Method for Switched-capacitor-array-based Waveform Samplers.

H Kim1, C-T Chen1, N Eclov1

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Summary
This summary is machine-generated.

A new time calibration method precisely measures non-uniform sampling intervals in DRS4 waveform samplers. This technique achieves an electronic time resolution of approximately 2.4 ps RMS, improving precision for switched-capacitor array technology.

Keywords:
Switched-CapacitorsTime CalibrationWaveform Sampling

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Area of Science:

  • Electronics
  • Instrumentation
  • Signal Processing

Background:

  • The DRS4 waveform sampler utilizes switched-capacitor cells, which inherently have non-uniform sampling intervals.
  • Precise time calibration is crucial for accurate waveform analysis in high-speed electronic systems.

Purpose of the Study:

  • To develop and validate a novel time calibration method for the DRS4 waveform sampler.
  • To accurately measure and correct for non-uniform sampling intervals in switched-capacitor cells.
  • To enhance the electronic time resolution of the DRS4 evaluation board.

Main Methods:

  • Utilized the proportionality between differential amplitude and sampling interval of adjacent cells responding to a sawtooth pulse.
  • Employed a 40 ns period sawtooth pulse generated by a Tektronix AWG7102 to calibrate 1024 cells individually.
  • Measured time resolution using two simultaneous Gaussian pulses and Gaussian fitting.

Main Results:

  • Achieved an electronic time resolution of approximately 2.4 ps RMS for the DRS4 evaluation board.
  • Demonstrated the method's ability to individually calibrate all 1024 switched-capacitor cells.
  • Compared time resolution dependencies with existing calibration methods.

Conclusions:

  • The new time calibration method effectively addresses non-uniform sampling intervals in DRS4 waveform samplers.
  • The developed technique significantly improves electronic time resolution.
  • This method shows potential applicability for other switched-capacitor-array waveform samplers.