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A New Time Calibration Method for Switched-capacitor-array-based Waveform Samplers.
Nuclear Instruments & Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment
|December 16, 2014
Summary
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.
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.
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