Results 241 to 250 of about 73,477 (301)
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Nature Medicine, 2007
With opinions on nearly everything under the sun, Nobel Laureate Peter Doherty is an equal opportunity offender. But he has always saved his best ideas for science.
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With opinions on nearly everything under the sun, Nobel Laureate Peter Doherty is an equal opportunity offender. But he has always saved his best ideas for science.
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2021
Abstract Diana Doherty is principal oboe of the Sydney Symphony Orchestra (Australia). She won first prize at the Prague Spring International Music Competition in 1991 and was a joint winner of the 1995 Young Concert Artist auditions in New York.
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Abstract Diana Doherty is principal oboe of the Sydney Symphony Orchestra (Australia). She won first prize at the Prague Spring International Music Competition in 1991 and was a joint winner of the 1995 Young Concert Artist auditions in New York.
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Power efficiency of OFDM signal amplification with Doherty and extended Doherty transmitters
2008 14th European Wireless Conference, 2008OFDM (orthogonal frequency division multiplex) achieves high spectral efficiency in broadband wireless communications but has poor amplification efficiency due to its large peak-to-average power ratio. This paper presents achievable average power efficiency for the OFDM signal when the Doherty and extended Doherty transmitters are employed.
Yasushi Yamao +2 more
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Authors’ reply to Doherty and Hawkins
BMJ, 2017We thank Doherty and Hawkins for their responses to our article.123 Our paper is a meta-analysis, so we adhered to the PRISMA guidelines.4 The CONSORT guidelines, as mentioned by Doherty, are for individual randomised trials and do not apply to our paper. The …
Øyvind, Holme +3 more
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Authors’ reply to Waldron and Doherty
BMJ, 2015We welcome Waldron and Doherty’s reply and are reassured by local efforts.1 2 We agree that for UK and Northern Ireland alone, the threat is low. However, our letter was aimed at an international readership, and Middle East respiratory syndrome coronavirus (MERS-CoV) infected travellers pose different threats to each receiving country because awareness
Alexander, Kumar +2 more
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Doherty Goes Digital: Digitally Enhanced Doherty Power Amplifiers
IEEE Microwave Magazine, 2016Efficiency enhancement techniques for high-power amplification systems are now mature technologies, with Doherty power amplifiers (PAs) being widely used in field-deployed wireless base stations. A typical Doherty PA consists of two parallel amplifiers (a carrier amplifier, biased in class-AB, and a peaking amplifier, biased in class-C), an input ...
Ramzi Darraji +2 more
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IEEE Microwave Magazine, 2010
For modulated signals with a high peak-to-average power ratio (PAPR), the transmitter has to be operated with its average output power backed off for an acceptable linearity at the expense of low efficiency. To achieve high efficiency and high linearity at the same time, both an efficiency enhancement technique and a linearization technique should be ...
Kim, B, Kim, I, Moon, J
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For modulated signals with a high peak-to-average power ratio (PAPR), the transmitter has to be operated with its average output power backed off for an acceptable linearity at the expense of low efficiency. To achieve high efficiency and high linearity at the same time, both an efficiency enhancement technique and a linearization technique should be ...
Kim, B, Kim, I, Moon, J
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The microwave Doherty amplifier
1994 IEEE MTT-S International Microwave Symposium Digest (Cat. No.94CH3389-4), 2002A microwave Doherty amplifier has been designed using PHEMT devices in a novel configuration at L-band. Power-added efficiency of 61% is achieved at -1 dB gain compression in CW and is maintained at 61% at 5.5 dB back-off from the above point. The theory, design and measurement for this new amplifier are discussed. >
R.J. McMorrow, D.M. Upton, P.R. Maloney
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2009
The Doherty power amplifier (DPA) is hereby presented and described starting from the basic idea up to more advanced and state-of-art results and guidelines. The DPA historical aspect is also covered, describing the timeline of its evolution. Moreover, the reasons related to why this architecture, roughly 80 years after its invention, is still on its ...
COLANTONIO, PAOLO +3 more
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The Doherty power amplifier (DPA) is hereby presented and described starting from the basic idea up to more advanced and state-of-art results and guidelines. The DPA historical aspect is also covered, describing the timeline of its evolution. Moreover, the reasons related to why this architecture, roughly 80 years after its invention, is still on its ...
COLANTONIO, PAOLO +3 more
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2015 IEEE MTT-S International Microwave Symposium, 2015
The Doherty power amplifier (DPA) architecture, in various formats using different technologies, has been a very popular means of providing high conversion efficiencies from raw electrical power to sophisticated modulated RF and microwave signals ever since the requirements for very high power amplitude modulated (AM) radio transmitters in the mid-1930'
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The Doherty power amplifier (DPA) architecture, in various formats using different technologies, has been a very popular means of providing high conversion efficiencies from raw electrical power to sophisticated modulated RF and microwave signals ever since the requirements for very high power amplitude modulated (AM) radio transmitters in the mid-1930'
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