Telecoms ♦ news digest
of the porphyin molecules and the spacing of those components. They designed specific structures that ruled out the other possibilities so that the only contribution to enhanced photocurrent could be from the hot electrons harvested from the plasmons.
“In our measurements, compared to conventional photoexcitation, we saw increases of three to 10 times in the efficiency of our process,” Bonnell comments. “And we didn’t even optimise the system. In principle you can envision huge increases in efficiency.”
Devices incorporating this process of harvesting plasmon-induced hot electrons could be customized for different applications by changing the size and spacing of nanoparticles, which would alter the wavelength of light to which the plasmon responds.
“You could imagine having a paint on your laptop that acted like a solar cell to power it using only sunlight,” Bonnell says. “These materials could also improve communications devices, becoming part of efficient molecular circuits.”
This work is described further in the paper, «Plasmon- Induced Electrical Conduction in Molecular Devices,» by Parag Banerjee et al in ACS Nano, 2010, 4 (2), pp 1019 - 1025. DOI: 10.1021/nn901148m
The research was supported by the U.S. Department of Energy and the National Science Foundation.
Anadigics unveils InGaP power amplifier series
The company’s ProVantage indium gallium phosphide PAs are suited to 3G & 4G high power mode efficiency
Anadigics has introduced the new ProVantage power amplifier (PA) product family.
The company’s ProVantage solutions deliver excellent efficiency and linearity to extend battery life and ensure high data throughput in LTE, WCDMA/HSPA, CDMA/ EVDO, and TD-SCDMA mobile devices.
“We recognise the tremendous diversity in mobile device requirements, ranging from voice-centric feature phones to power-hungry smartphones and tablets,” says Navi Miglani, product marketing director of Cellular Products at Anadigics.
“Our new ProVantage power amplifiers are optimised to deliver outstanding value by providing a best-in-class combination of high power mode efficiency, linearity, and reduced system costs. This, addition to our world-class cellular products portfolio, complements our industry- leading ProEficient and ProEficient-Plus solutions and enables Anadigics to target the needs of a wider range of market segments,” Miglani continues.
Anadigics ProVantage power amplifiers leverage the company’s InGaP-Plus technology to achieve outstanding performance and integration. These power amplifiers help extend battery life by offering three selectable bias modes that optimise efficiency for low, medium and high output power levels, as well as a shutdown mode with low leakage current.
ProVantage solutions are also designed for use with an external switch mode power supply (SMPS), such as average power tracking (APT), to further increase efficiency and reduce current consumption at low and medium operating powers.
Anadigics’ ProVantage power amplifiers provide world- class linearity to ensure stable cellular connectivity and high data throughput. The complete family of ProVantage solutions are offered in compact 3 mm x 3 mm x 0.9 mm packages and feature internal voltage regulation to save valuable PCB space.
Details of the packages are shown in the table below.
October 2013
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