A power-efficient, low-noise, wideband, integrated CMOS preamplifier for LSO/APD PET systems

A power-efficient, low-noise, wideband, 0.8-/spl mu/ CMOS charge-sensitive preamplifier has been designed and optimized for LSO/APD based PET systems. Low-noise, wideband performance is needed to achieve 1-ns FWHM timing resolution available from LSO/APD detectors, and power efficiency is needed sin...

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Bibliographic Details
Published in:IEEE transactions on nuclear science 2000-06, Vol.47 (3), p.810-817
Main Authors: Binkley, D.M., Puckett, B.S., Casey, M.E., Lecomte, R., Saoudi, A.
Format: Article
Language:English
Subjects:
Amplifiers (electronic)
Avalanche diodes
Capacitance
Design optimization
Detectors
Electric potential
Electrical capacitance tomography
Energy resolution
Gamma rays
Methodology
Noise
Optimization methods
Photodiodes
Positron emission
Positron emission tomography
Preamplifiers
Radiation detectors
Time measurements
Timing
Transconductance
Voltage
White noise
Wideband
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Summary:A power-efficient, low-noise, wideband, 0.8-/spl mu/ CMOS charge-sensitive preamplifier has been designed and optimized for LSO/APD based PET systems. Low-noise, wideband performance is needed to achieve 1-ns FWHM timing resolution available from LSO/APD detectors, and power efficiency is needed since thousands of preamplifiers are required in a LSO/APD based PET tomograph. A methodology for optimizing wideband timing performance is presented to minimize dominant, frequency-turn-up, input-noise current associated with input noise voltage and total capacitance at the input. The methodology suggests the use of a nMOS input device operating in moderate inversion for high transconductance and low input white-noise voltage consistent with moderate input capacitance. Measured preamplifier input-referred, white-noise voltage is 0.65 mV//spl radic/Hz and risetime is 6 ns (58 MHz 3-dB bandwidth). Measured timing resolution is 1.15 ns FWHM and energy resolution is 12.1% FWHM for 511-keV gamma rays detected by a 4/spl times/4/spl times/10 mm LSO crystal coupled to an APD. Measurements include the APD capacitance of 30 pF and are obtained at a preamplifier input-device current of only 2 mA.
ISSN:0018-9499
1558-1578
DOI:10.1109/23.856522