A new time calibration method for switched-capacitor-array-based waveform samplers

We have developed a new time calibration method for the DRS4 waveform sampler that enables us to precisely measure the non-uniform sampling interval inherent in the switched-capacitor cells of the DRS4. The method uses the proportionality between the differential amplitude and sampling interval of a...

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Bibliographic Details
Published in:Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment Accelerators, spectrometers, detectors and associated equipment, 2014-12, Vol.767 (C), p.67-74
Main Authors: Kim, H., Chen, C.-T., Eclov, N., Ronzhin, A., Murat, P., Ramberg, E., Los, S., Moses, W., Choong, W.-S., Kao, C.-M.
Format: Article
Language:English
Subjects:
Accelerators
Boards
Calibration
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
Gaussian
INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
Intervals
Samplers
Sampling
Switched-Capacitors
Time Calibration
Waveform Sampling
Waveforms
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Summary:We have developed a new time calibration method for the DRS4 waveform sampler that enables us to precisely measure the non-uniform sampling interval inherent in the switched-capacitor cells of the DRS4. The method uses the proportionality between the differential amplitude and sampling interval of adjacent switched-capacitor cells responding to a sawtooth-shape pulse. In the experiment, a sawtooth-shape pulse with a 40ns period generated by a Tektronix AWG7102 is fed to a DRS4 evaluation board for calibrating the sampling intervals of all 1024 cells individually. The electronic time resolution of the DRS4 evaluation board with the new time calibration is measured to be ~2.4ps RMS by using two simultaneous Gaussian pulses with 2.35ns full-width at half-maximum and applying a Gaussian fit. The time resolution dependencies on the time difference with the new time calibration are measured and compared to results obtained by another method. The new method could be applicable for other switched-capacitor-array technology-based waveform samplers for precise time calibration.
ISSN:0168-9002
1872-9576
DOI:10.1016/j.nima.2014.08.025