news review
Mitsubishi Electric’s Ku-band GaN HEMT goes into orbit
MITSUBISHI ELECTRIC CORPORATION has developed a GaN high-electron mobility transistor (HEMT) Ku-band (12–18GHz) amplifier for satellite earth stations.
The MGFK47G3745 features an output power of 50W at 24V high-voltage operation, linear gain of 9dB and power added efficiency of 30 percent, 10 points greater than its predecessor, the MGFK44A4045.
Mitsubishi says it expects the device to reduce the number of high frequency amplifiers by half and contribute to greater power saving and downsizing for power transmitter equipment.
The module also has an output power meeting 3rd-order inter modulation (IM3) of -25dBc of 43dBm and is internally impedance-matched. The IDQ (Quiescent Drain Current) is 1A and the frequency is 13.75 – 14.5 GHz (Ku band).
Simplified schematic of amplifier In recent years, the use of GaAs amplifiers in microwave power transmitters has been increasingly replaced with GaN amplifiers due to their high breakdown-voltage,
power density and saturated electron speeds.
Satellite-based communication, especially in the Ku-band, enables communication to be established under adverse conditions, such as during natural disasters, and in areas where communication facilities are hard to build. Mobile earth-based stations require in-vehicle portability and must be easy to install, so power-saving measures and downsized power transmitters are highly useful in helping to minimise the size of earth stations.
Mitsubishi Electric will begin shipping samples of the MGFK47G3745 on October 1st.
First Solar and PG&E unite for 72 MW California projects
First Solar has signed power purchase agreements with Pacific Gas and Electric Company (PG&E) for 72 MW AC of solar electricity to be generated at two photovoltaic power plants that First Solar is developing in central California.
The 32-megawatt (MW) Lost Hills project in Kern County and the 40-MW Cuyama project in Santa Barbara County are expected to create up to 600 jobs at peak construction.
Project construction could start in 2013 as soon as the development process is complete, depending on plans of the projects’ eventual owners.
Together, Lost Hills and Cuyama will produce enough clean, renewable energy
to power some 24,000 California homes, offsetting approximately 45,000 metric tons of CO2 annually - the equivalent of taking about 8,900 cars off the road each year.
“We are very pleased to add these projects to PG&E’s solar portfolio, helping it and California reach their renewable energy goals,” said Brian Kunz, First Solar Vice President of Project Development. “Grid-friendly utility-scale power plants from First Solar are readily integrated into the electrical infrastructure.”
The power purchase agreements - each with a delivery term beginning in 2019 - are subject to approval by the California Public Utilities Commission, whose decision is expected in the first half of 2013.
12
www.compoundsemiconductor.net October 2012
Lumileds boosts lumens per watt
by 27 percent PHILIPS LUMILEDS has unveiled the LUXEON H50-2 LED. With a typical efficacy of more than 80 lumens per watt, the LUXEON H50-2 LED improves on the efficacy of the existing LUXEON H 50V LED by 27 percent. What’s more, it offers 10 percent more lumens per watt and 30 percent higher luminous flux than other competitive products, as well as lumen maintenance that exceeds rigorous ENERGYSTAR requirements. Designed for space constrained, retrofit bulbs such as the A19, the compact LUXEON H50-2 has a high voltage architecture that enables more form factors and lowers costs through the use of cost-efficient drivers.
Unlike other high voltage LED products, every LUXEON H50-2 LED is hot tested at 850C to guarantee performance at operating conditions, and is colour binned into three and five SDCM to ensure consistency among LED packages. In addition to A-line retrofits, the LUXEON H50-2 can drive down the costs of other space-constrained lamps such as candelabra and GU10 lamps. For specialty applications such as undercabinet, track and poultry lighting, LUXEON H50-2 has a smaller form factor that allows for even more streamlined solutions.
“We continually work with our customers to help them address the challenges through the introduction of innovative new LED packages such as the LUXEON H50-2,” says Viji Krishnamurthy, Product Manager at Philips Lumileds. “This new LED package, works with simple, highly efficient drivers enabling lighting designers to create unique form factors at lower costs, while still offering LUXEON performance and quality.”
Page 1 |
Page 2 |
Page 3 |
Page 4 |
Page 5 |
Page 6 |
Page 7 |
Page 8 |
Page 9 |
Page 10 |
Page 11 |
Page 12 |
Page 13 |
Page 14 |
Page 15 |
Page 16 |
Page 17 |
Page 18 |
Page 19 |
Page 20 |
Page 21 |
Page 22 |
Page 23 |
Page 24 |
Page 25 |
Page 26 |
Page 27 |
Page 28 |
Page 29 |
Page 30 |
Page 31 |
Page 32 |
Page 33 |
Page 34 |
Page 35 |
Page 36 |
Page 37 |
Page 38 |
Page 39 |
Page 40 |
Page 41 |
Page 42 |
Page 43 |
Page 44 |
Page 45 |
Page 46 |
Page 47 |
Page 48 |
Page 49 |
Page 50 |
Page 51 |
Page 52 |
Page 53 |
Page 54 |
Page 55 |
Page 56 |
Page 57 |
Page 58 |
Page 59 |
Page 60 |
Page 61 |
Page 62 |
Page 63 |
Page 64 |
Page 65 |
Page 66 |
Page 67 |
Page 68 |
Page 69 |
Page 70 |
Page 71 |
Page 72 |
Page 73 |
Page 74 |
Page 75 |
Page 76 |
Page 77 |
Page 78 |
Page 79 |
Page 80 |
Page 81 |
Page 82 |
Page 83 |
Page 84 |
Page 85 |
Page 86 |
Page 87 |
Page 88 |
Page 89 |
Page 90 |
Page 91 |
Page 92 |
Page 93 |
Page 94 |
Page 95 |
Page 96 |
Page 97 |
Page 98 |
Page 99 |
Page 100 |
Page 101 |
Page 102 |
Page 103 |
Page 104 |
Page 105 |
Page 106 |
Page 107 |
Page 108 |
Page 109 |
Page 110 |
Page 111 |
Page 112 |
Page 113 |
Page 114 |
Page 115 |
Page 116 |
Page 117 |
Page 118 |
Page 119 |
Page 120 |
Page 121 |
Page 122 |
Page 123 |
Page 124 |
Page 125 |
Page 126 |
Page 127 |
Page 128 |
Page 129 |
Page 130 |
Page 131