A 10-mc/s, 0.5- mu m CMOS constant-fraction discriminator having built-in pulse tail cancellation

A 0.5- mu m, fully-integrated CMOS, constant-fraction discriminator (CFD) is presented for 10-Mc/s operation. The CFD utilizes a timing-shaping filter to provide amplitude insensitive time discrimination without delay lines or other external components. Continuous-time baseline restorers are used to...

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Bibliographic Details
Published in:IEEE transactions on nuclear science 2002-06, Vol.49 (3)
Main Authors: Binkley, D M, Puckett, B S, Swann, B K, Rochelle, JA, Musrock, MS, Casey, ME
Format: Article
Language:English
Subjects:
BGO (crystal)
Cancellation
CMOS
Computational fluid dynamics
Detectors
Discriminators
Dynamic range
Mathematical models
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Summary:A 0.5- mu m, fully-integrated CMOS, constant-fraction discriminator (CFD) is presented for 10-Mc/s operation. The CFD utilizes a timing-shaping filter to provide amplitude insensitive time discrimination without delay lines or other external components. Continuous-time baseline restorers are used to cancel CMOS dc offsets and provide signal tail cancellation for both the arming and constant-fraction signals. Near total signal tail cancellation at 100 ns permits operation at count rates up to 10 Mc/s. Measured intrinsic timing resolution is 40 to 90 ps FWRM for a 3.7:1 input dynamic range and measured walk is 20 ps for a 2.7:1 dynamic range increasing to 80 ps for a 3.7:1 dynamic range. Measured tinting resolution for an LSO/PMT detector against a plastic/PMT detector is 1.00-ns FWHM at low count rates increasing to 1.27-ns FWRM at 6.0 Mc/s. The CFD is part of a 0.5- mu m CMOS front-end integrated circuit designed for large-area, high-count-rate LSO or BGO detectors used in PET medical imaging.
ISSN:0018-9499
DOI:10.1109/TNS.2002.1039626