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In this paper, we report the latest progress of a GaN-based broad-band power amplifier using AlGaN/GaN high electron mobility transistors (HEMTs), grown on sapphire substrates, as the active devices. The devices were flip-chip integrated onto the aluminum nitride circuit board for thermal management and electric connection. The circuit topology used novel(More)
Simultaneous measurements of mean airflow rate, vocal intensity and fundamental frequency were made during flexible video endoscopic recording of the vowel /i/ sustained in two vocal registers, modal and falsetto. The glottal closure patterns of four males and four females were evaluated by visually inspecting the video images. Acoustic signals were(More)
We review advances in GaN-based microwave power field-effect-transistors (FETs). Evolution in device technology included metal-semiconductor-field-effect-transistors (MESFETs), heterostructure-field-effect-transistors (HFETs), modulation-doped-field-effect-transistors (MODFETs) or highmobility-transistors (HEMT), HEMTs with high Al contents, HEMTs with gate(More)
Objective. The mechanisms of tinnitus are known to alter neuronal circuits in the brainstem and cortex, which are common to several comorbid conditions. This study examines the relationship between tinnitus and anxiety/depression. Subjects and Methods. Ninety-one male veterans with subjective tinnitus were enrolled in a Veterans Affairs Tinnitus Clinic. The(More)
We report a GaN-based broadband power amplifier using AlGaN/GaN-HEMTs, grown on sapphire substrates, as the active devices. The circuit topology used novel LCRmatching networks in a 4-way binaryWilkinson combiner structure. The devices were flip-chip bonded onto the AlN circuit for thermal management. Using devices with 0.7-pm gate length and 4-mm gate(More)
OBJECTIVE There is a growing trend for the routine use of the facial nerve monitor (FNM) in chronic ear surgery. We aimed to examine current patterns in the use of FNMs in chronic ear surgery. STUDY DESIGN Descriptive design (survey). SETTING Academic health center. METHODS A 10-question survey was designed to identify level of training, scope of(More)
Background: Allograft coronary artery disease (ACAD) is a common cause of morbidity and mortality post-orthotopic heart transplantation (OHT). ACAD progression may be reduced by modifying cardiovascular risk factors, such as hyperlipidemia and hypertension. We sought to evaluate the management of hyperlipidemia and hypertension among OHT recipients followed(More)
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