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

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5 Author(s)
Binkley, D.M. ; Concorde Microsystems Inc., Knoxville, TN, USA ; Puckett, B.S. ; Casey, M.E. ; Lecomte, R.
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A power-efficient, low-noise, wideband, 0.8-μ 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 nV/√(Hz) and risetime is 6 ns (58 MHz 3-dB bandwidth). Measured timing resolution is 1.17 ns FWHM and energy resolution is 18% FWHM for 511-keV gamma rays detected by a 4×4×10 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

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Nuclear Science Symposium, 1999. Conference Record. 1999 IEEE  (Volume:1 )

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