## Theses, Dissertations, and Student Research from Electrical & Computer Engineering

Sina Balkir

Michael Hoffman

Fall 11-30-2018

#### Citation

Rogge, D. (2018). ASIC Design to Support Low Power High Voltage Power Supply for Radiation Monitoring Applications (Master's Thesis)

A Thesis Presented to the Faculty of The Graduate College at the University of Nebraska In Partial Fulfilment 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, 2018

A low power high voltage power supply is designed for use in a long duration radiation monitoring system. The supply employs a flexible pulse frequency modulation switching controller implemented in a 0.35 $\mu$m CMOS technology. The controller drives and regulates a flyback transformer driven 12-stage Cockroft-Walton voltage multiplier chain. The chain provides bias for the dynodes of a photomultiplier tube. The supply voltage is selectable via a 12-bit on-chip digital to analog converter. The system is designed for low power operation and immunity to supply voltage variation as the application is battery-powered.