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Performance and reliability data for harmonically-terminated, high-efficiency microwave power amplifiers designed from active harmonic loadpull data utilizing high breakdown voltage AlGaAs-InGaAs-GaAs pHEMTs are reported. Single stage MIC amplifiers fabricated with 2/spl times/25 mm gate width pHEMTs resulted in P/sub out/=20 W and PAE=66% at 1.5 GHz and(More)
In a developmental center, blood lead level was determined by atomic absorption for individuals who were admitted, discharged, or had pica. In 1977, blood lead level was 0 to 29 ug/dL in 298 (92%), 30 to 49 ug/dL in 20 (6%), and 50 to 79 ug/dL in 5 (2%) of the 323 individuals screened. In contrast, in 1994, blood lead level was 0 to 4 ug/dL in 58 (88%) and(More)
Near-infrared spectroscopy may allow continuous and noninvasive monitoring of regional brain hemoglobin oxygen saturation by measuring the differential absorption of infrared light by oxyhemoglobin and deoxyhemoglobin. We have previously examined the correlation between the spectroscopic signal generated by a prototype cerebral oximeter (Invos 3100;(More)
We report AlGaAs/InGaAs/GaAs PHEMTs with high efficiency and power output, suitable for use in K and Ka-band applications. On-wafer active load-pull measurements were performed at 20 GHz on double-recessed devices with a gatelength (L/sub g/) of 0.14 /spl mu/m. P/sub out/=26.7 dBm was obtained from a 640 /spl mu/m part with power added efficiency (PAE) of(More)
Of 49 employees serving developmentally disabled persons, 13 (27%) were found to have parvovirus B19 infection on the basis of serum positivity for parvovirus B19 IgM by enzyme-linked immunosorbent assay. Two employees had severe peripheral symmetric polyarthropathy lasting longer than 6 months. Infection control measures are described.
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