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Noise parameters of HEMTs: analysis of their properties from a circuit model approach (1996)

Caddemi, A. ; Sannino, M.

Bradford : Emerald

Compel 15 (1996), S. 47-57

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ISSN: 0332-1649

Source: Emerald Fulltext Archive Database 1994-2005

Topics: Electrical Engineering, Measurement and Control Technology , Mathematics

Notes: Noise parameters of high electron mobility transistors (HEMT) at microwave frequencies are a subject of active research since the knowledge of their performance is of key importance for the use of these devices for designing low-noise amplifiers. Employs a simple noise model to derive the analytical expressions for the device noise parameters F0, G0 and N in terms of the electrical elements associated with the basic equivalent circuit of an HEMT. Analyses such expressions to establish some fundamental relationships, as well as the expected noise performance of the device when the parasitic elements representing package effects are included.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1108/03321649610130236

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Microwave effects on isolated chick embryo hearts (1986)

Caddemi, A. ; Tamburello, C. C. ; Zanforlin, L. ; [et al.]

New York, NY [u.a.] : Wiley-Blackwell

Bioelectromagnetics 7 (1986), S. 359-367

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ISSN: 0197-8462

Keywords: microwaves ; heartbeat ; chick embryo hearts ; Life and Medical Sciences ; Occupational Health and Environmental Toxicology

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Biology , Physics

Notes: This study was designed to examine the effects of microwaves on the electric activity of hearts as a means of elucidating interactive mechanisms of nonionizing radiations with cardiac tissue. Experiments were performed on isolated hearts of 9-12-day-old chick embryos placed in small petri dishes. Oxygenated isotonic Ringer's solution at 37°C permitted heart survival. Samples were irradiatd at 2.45 GHz with a power density of 3 mW/cm2. The heart signal was detected with a glass micropipet inserted into the sinoatrial node and examined by means of a Berg-Fourier analyzer. Pulsed microwaves caused the locking of the heartbeat to the modulation frequency, whereas continuous wave irradiation might have induced slight bradycardia. Pulsed fields induced stimulation or regularization of the heartbeat in arrhythmia, fibrillation, or arrest of the heart.

Additional Material: 6 Ill.