Performance of non-delay-line constant-fraction discriminator timing circuits

Conference · Mon Aug 01 00:00:00 EDT 1994 · IEEE Transactions on Nuclear Science (Institute of Electrical and Electronics Engineers); (United States)

OSTI ID:6815947

Binkley, D M ^[1]

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1. CTI PET Systems, Inc., Knoxville, TN (United States)

The delay line in the constant-fraction discriminator (CFD) can be replaced with circuit networks to permit monolithic fabrication. The previously reported non-delay-line CFD utilizing a single-pole highpass filter is reviewed, followed by a presentation of non-delay-line circuits utilizing Gaussian lowpass filters. Circuit response for non-delay-line CFDs utilizing single-pole highpass or single-pole lowpass filters is shown to be equivalent. However, timing-signal underdrive and zero-crossing slope are increased and timing latter reduced when higher-order low pass filters are used. Comparisons of non-delay-line and delay-line CFD circuits timing performance are presented for lowpass-filtered step inputs representative of scintillation detector signals. Timing resolution of non-delay-line and delay-line CFDs is compared for BGO/photomultiplier scintillation detector applications. Monte Carlo simulations indicate that comparable timing resolution is available with proper selection of non-delay-line CFD filter time-constants. A fully-monolithic CMOS, non-delay-line CFD was fabricated to experimentally validate timing resolution. The measured timing resolution of 3.26 ns FWHM and 6.5 ns FWTM is in good agreement with measured resolution of 3.30 ns FWHM and 6.4 ns FWTM for a standard delay-line CFD circuit.

• OSTI ID: 6815947
• Report Number(s): CONF-931051--
• Journal Information: IEEE Transactions on Nuclear Science (Institute of Electrical and Electronics Engineers); (United States), Journal Name: IEEE Transactions on Nuclear Science (Institute of Electrical and Electronics Engineers); (United States) Vol. 41:4Pt1; ISSN 0018-9499; ISSN IETNAE
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
426000 -- Engineering-- Components
Electron Devices & Circuits-- (1990-)
440101* -- Radiation Instrumentation-- General Detectors or Monitors & Radiometric Instruments
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
BGO DETECTORS
COMPUTERIZED SIMULATION
DELAY CIRCUITS
DISCRIMINATORS
ELECTRONIC CIRCUITS
INTEGRATED CIRCUITS
MEASURING INSTRUMENTS
MICROELECTRONIC CIRCUITS
PERFORMANCE
PULSE CIRCUITS
PULSE DISCRIMINATORS
RADIATION DETECTORS
RESOLUTION
SCINTILLATION COUNTERS
SIMULATION
SOLID SCINTILLATION DETECTORS
TIME RESOLUTION
TIMING CIRCUITS
TIMING PROPERTIES