scholarly journals S-band hybrid amplifiers based on hydrogenated diamond FETs

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Walter Ciccognani ◽  
Sergio Colangeli ◽  
Claudio Verona ◽  
Fabio Di Pietrantonio ◽  
Domenico Cannatà ◽  
...  
Keyword(s):  
High Power ◽  
Noise Figure ◽  
Low Noise ◽  
The Other ◽  
Two Stage ◽  
Microwave Frequencies ◽  
High Power Operation ◽  
Power Operation ◽  
Two Stages ◽  
Noise Amplification

Abstract The first realizations of S-band hybrid amplifiers based on hydrogenated-diamond (H-diamond) FETs are reported. As test vehicles of the adopted H-diamond technology at microwave frequencies, two designs are proposed: one, oriented to low-noise amplification, the other, oriented to high-power operation. The two amplifying stages are so devised as to be cascaded into a two-stage amplifier. The activities performed, from the technological steps to characterization, modelling, design and realization are illustrated. Measured performance demonstrates, for the low-noise stage, a noise figure between 7 and 8 dB in the 2–2.5 GHz bandwidth, associated with a transducer gain between 5 and 8 dB. The OIP3 at 2 GHz is 21 dBm. As to the power-oriented stage, its transducer gain is 5–6 dB in the 2–2.5 GHz bandwidth. The 1-dB output compression point at 2 GHz is 20 dBm whereas the OIP3 is 33 dBm. Cascading the measured S-parameters of the two stages yields a transducer gain of 15 ± 1.2 dB in the 2–3 GHz bandwidth.

Low‐noise and high‐power operation in high reflectivity coated nonabsorbing mirror GaAlAs lasers

1990 ◽  
Vol 68 (9) ◽  
pp. 4420-4425 ◽  
Author(s):  
H. Naito ◽  
H. Nakanishi ◽  
H. Nagai ◽  
M. Yuri ◽  
N. Yoshikawa ◽  
...  
Keyword(s):  
High Power ◽  
Low Noise ◽  
High Reflectivity ◽  
High Power Operation ◽  
Power Operation

High-power operation of 630 nm-band transverse-mode stabilised AlGaInP laser diodes with current-blocking region near facets

1991 ◽  
Vol 27 (8) ◽  
pp. 661 ◽  
Author(s):  
H. Hamada ◽  
M. Shono ◽  
S. Honda ◽  
R. Hiroyama ◽  
K. Matsukawa ◽  
...  
Keyword(s):  
High Power ◽  
Laser Diodes ◽  
Transverse Mode ◽  
High Power Operation ◽  
Power Operation ◽  
Current Blocking

Tapered laser arrays for high power operation (> 1.4 W CW) at 1.59 [micro sign]m for applications in surgery

1998 ◽  
Vol 34 (10) ◽  
pp. 993 ◽  
Author(s):  
P.J. Williams ◽  
J.J. Lewandowski ◽  
D.J. Robbins ◽  
A.K. Wood ◽  
F.O. Robson ◽  
...  
Keyword(s):  
High Power ◽  
Laser Arrays ◽  
High Power Operation ◽  
Power Operation ◽  
Tapered Laser

High-Power Operation of Acoustic-Electric Power Feedthroughs Through Thick Metallic Barriers

2012 ◽  
Author(s):  
K. R. Wilt ◽  
H. A. Scarton ◽  
G. J. Saulnier ◽  
T. J. Lawry ◽  
J. D. Ashdown
Keyword(s):  
Power Density ◽  
High Power ◽  
Electrical Power ◽  
Power Transfer ◽  
Receive Transducer ◽  
High Power Operation ◽  
Linear Effects ◽  
Power Limits ◽  
Power Operation ◽  
Power Testing

Throughout the last few years there has been a significant push to develop a means for the transmission of electrical power through solid metallic walls using ultrasonic means. The bulk of this effort has been focused on using two coaxially aligned piezoelectric transducers on opposite sides of a thick metallic transmission barrier, where one transducer serves as the “transmit” transducer and the other as the “receive” transducer. Previous modeling has predicted reasonably high power transfer efficiencies through the wall using this type of “acoustic-electric channel” to be possible at low power levels, which implies that channel component operates in a linear range with little concern of failure. High-power testing of two acoustic-electric channels has been done in an effort to determine power limits on such channels and to determine levels at which non-linear effects on the piezoelectrics become non-negligible. The tested channels are characterized by the “power density” imposed on the transmit transducer, that is, the power applied per unit area, as the values found for maximum power density are considered to be independent of transducer radii. The constructed channels are shown to be capable of transmitting large amounts of power (over 100 watts) without failure; and further, extrapolation of the results to channels with larger diameter transducers predicts power transfer of 1 kW to be highly feasible.

High-power operation of 630 nm-band tensile strained multiquantum-well AlGaInP laser diodes with a multiquantum barrier

1993 ◽  
Vol 29 (11) ◽  
pp. 1010-1011 ◽  
Author(s):  
M. Shono ◽  
S. Honda ◽  
T. Ikegami ◽  
Y. Bessyo ◽  
R. Hiroyama ◽  
...  
Keyword(s):  
High Power ◽  
Laser Diodes ◽  
High Power Operation ◽  
Power Operation ◽  
Multiquantum Well
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