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The approach is suitable for the experimental characterization of existing amplifiers
Consequently, relaxed amplifiers with lower power consumption can be used.
Open accessProceedings ArticleDOI
Stephen Ralph, Ronan Farrell 
01 Aug 2007
22 Citations
Switching power amplifiers offer the potential for superior efficiencies if used at radio frequencies.
The study uncovers several important new features of the amplifiers.
Proceedings ArticleDOI
Frederick H. Raab, David Ruppe 
23 Jun 2003
8 Citations
The use of electronically tuned components allows the PA to be tuned and operated efficiently over a wide range of frequencies without band-switching.
Proceedings ArticleDOI
Thomas Lehmann, R. Knoechel 
15 Jun 2008
26 Citations
The average power added efficiency of the whole transmitter may be improved by 30% compared to conventional amplifiers.
It is a promising candidate to design broadband and high-efficiency power amplifiers.
Although the amplifiers are only partially gain-clamped, results show that they exhibit good gain-clamped characteristics.
The presence of the minimum of the efficiency affects the design of amplifiers specifically optimized for frequency conversion by FWM.
Imperfect amplifiers can also enhance the system performance, under conditions which are generally satisfied in practice.

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Why is wavelength of 1285nm important for a laser?
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The wavelength of 1285nm is significant for lasers due to its relevance in various applications. In the context of laser communication systems, different wavelengths are chosen based on propagation issues and technology maturity. Additionally, in the development of broadband wavelength-swept lasers, a scanning range from 1129nm to 1352nm was achieved, highlighting the importance of this wavelength region in biophotonics and optical fiber sensors. Moreover, a wavelength-swept laser constructed at the 850nm region demonstrated high performance with narrow linewidths and broad bandwidths, showcasing the versatility and utility of different wavelength ranges in laser systems. Therefore, the 1285nm wavelength holds importance across various fields such as communication, biophotonics, and sensor technologies.
How many transistors do Class A amplifiers use?
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Class A amplifiers use at least one transistor for amplification.
What is the typical photocurrent required for efficient operation of photodetectors in imaging systems?
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The typical photocurrent required for efficient operation of photodetectors in imaging systems varies depending on the specific design and application. However, recent advancements in photodiode technology have enabled the generation of high RF power directly from the output of a photodiode, with maximum small-signal compression currents exceeding 700 mA at 300 MHz. In the case of germanium vertical p-i-n photodetectors, the photocurrent is shown to be proportional to the width of the depletion layer, which allows for high-speed operation. In the case of InAs/GaAs p-i-p quantum dots infrared photodetectors, the device exhibits low dark current and large photocurrent at room temperature. For two-dimensional-electron-gas-based AlGaN/GaN metal-semiconductor-metal photodetectors, the photocurrent response characteristics indicate a peak response at a specific wavelength, suggesting a potential for high-speed operation. Therefore, the required photocurrent for efficient operation of photodetectors in imaging systems can vary depending on the specific technology and design.
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To decrease cosmic noise during orbital angular momentum (OAM) transmission, a proposed method is to utilize an OAM multiplexing transmission scheme in a satellite formation relay system. This scheme involves establishing a channel model for the OAM wave from the base station to the relay satellites and then forwarding it to the central receiver. The influence of orbit distribution and random jitter on channel capacity is analyzed, and it is found that a uniform and evenly spaced satellite formation has the highest multiplexed channel capacity and anti-interference performance. Another approach is to introduce the interferometry code spread in the antenna element of OAM multiplexing transmission at the transmitter. This reduces the peak-to-average power ratio (PAPR) and improves power amplification efficiency.
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What is advantage of HE11 mode communication?
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The advantage of HE11 mode communication is its high common-mode rejection degree, high out-of-band rejection, and simple structure. HE11 mode communication also allows for better coupling to the fundamental free space Gaussian mode, resulting in smaller reflection and improved performance. Additionally, HE11 mode communication offers a wide bandwidth and low reflection, making it suitable for high power gyro-amplifiers operating in the low terahertz region. The mode converter used in HE11 mode communication has a high conversion efficiency, with the ability to convert a significant portion of power from TM11 mode to HE11 mode. Overall, HE11 mode communication provides efficient power transmission, low loss, and improved performance in various applications.
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