Electrical & Computer Engineering, Department of


First Advisor

Sina Balkir

Second Advisor

Michael Hoffman

Date of this Version

Winter 12-2-2021


J. Medinger. Low-Noise, Low-Power Analog Front End for Dual Detector, Event-Driven Radioactive Isotope Identification. MS thesis, University of Nebraska-Lincoln, Lincoln, Nebraska, December 2021


A THESIS Presented to the Faculty of The Graduate College at the University of Nebraska In Partial Fulfillment of Requirements For the Degree of Master of Science, Major: Electrical Engineering, Under the Supervision of Professors Sina Balkir and Michael Hoffman. Lincoln, Nebraska: December, 2021

Copyright © 2021 Joseph Medinger


An analog front end (AFE) design for a low-noise, low-power, event-driven radioactive spectroscopy system is implemented in a 65 nm CMOS technology. The AFE is optimized for use with two scintillation based detectors, CsI(Na) and LaBr3(Ce), that utilize photo-multiplier tubes for charge amplification. The amplification within the AFE is accomplished through charge sensitive amplifier designs that are tailored to each detector type. The AFE includes adjustable bias generation circuits to allow amplifier tuning for process, voltage, and temperature variations. The presented AFE is implemented along with analog to digital acquisition circuits and a microcontroller to provide a single-chip radioactive spectroscopy system ASIC. The fabricated system ASIC performance is verified through radioactive spectroscopy testing of known isotope samples.

Advisors: Sina Balkir and Michael Hoffman