Connor Nogales

• Graduate Student at University of Colorado Boulder

The effect of source (gate-side) and load (drain-side) impedance match on the linearity and efficiency of an envelope-tracked power amplifier (PA) is investigated. Conventionally designed GaN PAs exhibit an increasing gain magnitude and phase with increasing drain supply voltage. When this supply voltage is dynamically modulated in discrete levels...

This letter demonstrates a gate pulsing technique to reduce the ringing in multilevel dynamic voltage supplies used for modulating the drain bias of GaN radio-frequency power amplifiers (RFPAs). Supply modulation can improve overall average efficiency when the RFPA is amplifying signals with varying envelopes. Multilevel discrete supply modulators...

Modern RF communication and electronic warfare applications require systems capable of amplifying signals with high bandwidths and high peak-to-average power ratios (PAPRs). One technique used to meet these demands is supply modulation also known as envelope tracking where the drain voltage of the power amplifier (PA) is dynamically changed accordi...

Water electrolysis is a key technology for oxygen and hydrogen production in space, finding application in environmental control and life support systems, propulsion technologies, and high-density energy storage devices. However, the management of multiphase flows in microgravity is complicated due to the absence of buoyancy. Diamagnetic buoyancy c...

This article presents the design and nonlinear analysis of an octave-bandwidth transmit in-phase power combiner feed network. The goal is to evaluate the effect of nonlinearities on the in-phase spatial power combiner figures of merit (FoMs), namely effective isotropically radiated power (EIRP), overall efficiency, and linearity across a wide bandw...

MakerSat-1, a 1U cubesat, is a proof-of-concept mission from Northwest Nazarene University (NNU) and Made In

This chapter overviews different machine vision systems in agricultural applications. Several different applications are presented, but a machine vision system which estimates fruit yield, an example of an orchard management application, is discussed at length. From the farmer’s perspective, an early yield prediction serves as an early revenue esti...

Northwest Nazarene University (NNU) undergraduate engineering students and faculty designed and built Idaho's first CubeSat, MakerSat-0, which NASA launched into orbit on Nov. 18, 2017 from Vandenberg AFB aboard a Delta II rocket. MakerSat-0 was one of five CubeSats chosen by NASA in 2016 for the ELaNa XIV mission. It is the first in a series of pr...

MakerSat is a technology proof-of-concept mission from Northwest Nazarene University that will demonstrate microgravity additive manufacturing, assembly, and deployment of a CubeSat from the International Space Station (ISS). MakerSat is a 1U multi-project satellite, supporting up to four science payloads that can be developed by four independent t...