Discriminator Design Considerations for Time-Interval Measurement Circuits in Collider Detector Systems

Michael L. Simpson; Michael J. Paulus

doi:10.1109/23.659559

Discriminator Design Considerations for Time-Interval Measurement Circuits in Collider Detector Systems

Michael L. Simpson, Michael J. Paulus

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9 Scopus citations

Abstract

An analysis of timing jitter from leading-edge discriminators (LED's) and constant-fraction discriminators (CFD's) is presented. The jitter is calculated for the cases of random white noise, coherent noise (e.g., digital switching noise or ac power-line hum), and mixed (random and coherent) noise for both discriminator architectures. A general jitter equation valid for all of these conditions is derived. It is shown that the discriminator bandwidth for minimum jitter is strongly dependent on the amount of coherent noise. This effect is shown to be more pronounced for the LED. Even though off-line walk adjustments are possible for many timing measurements, the CFD is shown to provide a major advantage by acting as a correlated double sampler that removes much of the coherent noise expected in large, multichannel collider detector systems.

Original language	English
Pages (from-to)	98-104
Number of pages	7
Journal	IEEE Transactions on Nuclear Science
Volume	45
Issue number	1
DOIs	https://doi.org/10.1109/23.659559
State	Published - 1998

Funding

Manuscript received May 5, 1997; revised October 2, 1997. This work was supported by the U.S. Department of Energy and performed at the Oak Ridge National Laboratory, managed by Lockheed Martin Energy Research, Inc., for the U.S. Department of Energy under Contract DE-AC05-84OR21400. The authors are with Oak Ridge National Laboratory, Oak Ridge, TN 37831-6006 USA. Publisher Item Identifier S 0018-9499(98)01216-7.

Keywords

Collider detector systems
Constant fraction discriminator
Timing electronics
Timing jitter

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10.1109/23.659559

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abstract = "An analysis of timing jitter from leading-edge discriminators (LED's) and constant-fraction discriminators (CFD's) is presented. The jitter is calculated for the cases of random white noise, coherent noise (e.g., digital switching noise or ac power-line hum), and mixed (random and coherent) noise for both discriminator architectures. A general jitter equation valid for all of these conditions is derived. It is shown that the discriminator bandwidth for minimum jitter is strongly dependent on the amount of coherent noise. This effect is shown to be more pronounced for the LED. Even though off-line walk adjustments are possible for many timing measurements, the CFD is shown to provide a major advantage by acting as a correlated double sampler that removes much of the coherent noise expected in large, multichannel collider detector systems.",

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AB - An analysis of timing jitter from leading-edge discriminators (LED's) and constant-fraction discriminators (CFD's) is presented. The jitter is calculated for the cases of random white noise, coherent noise (e.g., digital switching noise or ac power-line hum), and mixed (random and coherent) noise for both discriminator architectures. A general jitter equation valid for all of these conditions is derived. It is shown that the discriminator bandwidth for minimum jitter is strongly dependent on the amount of coherent noise. This effect is shown to be more pronounced for the LED. Even though off-line walk adjustments are possible for many timing measurements, the CFD is shown to provide a major advantage by acting as a correlated double sampler that removes much of the coherent noise expected in large, multichannel collider detector systems.

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Discriminator Design Considerations for Time-Interval Measurement Circuits in Collider Detector Systems

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