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  • MMIC问答 1 2009-10-12 17:30
    今天开始,推出一个系列的“MMIC问答”,基本包括MMIC设计的方方面面。当然,这个高度不是我所能达到的,我只是做做打字员,借花献佛。再次强烈推荐Steve Marsh著《Practical MMIC Design》。 *** Chapter 2: Component Technology and Foundry Choice Questions:  1. What characteristics of the semiconductors material determine the frequency range over which it can be used for producing MMICs? 2. Which semiconductor substrate materials exhibit a wide bandgap, making them suitable for high-output power app...

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  • The International Microwave Symposium (IMS), June 7-12 at the Boston Convention & Exhibition Center in Boston, MA, will feature 430 technical presentations in over 90 sessions, representing the latest research in the field from around the world and organized in four technical tracks: Microwave Systems; Active Components; Passive Components; and Microwave Modeling. “The topics of the program’s diverse technical presentations range from components to systems and feature emerging compon...

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  • WOBURN, Mass.--(BUSINESS WIRE)--Jun. 2, 2009-- Skyworks Solutions, Inc. (NASDAQ:SWKS), an innovator of high reliability analog and mixed signal semiconductors enabling a broad range of end markets, today announced its acquisition of Axiom Microdevices, the world's only volume supplier of CMOS-based power amplifiers for mobile phones. ...

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  • From: compoundsemiconductor.net Partnerships with NREL on concentrated photovoltaics, and a variety of customers on high power RF are set to bring new business to the company's Greensboro fabs. GaAs chip pioneer RF Micro Devices is readying two significant departures from its traditional business model, as it enters the foundry services and solar cell markets. The US National Renewable Energy Laboratory's John Geisz holds an inverted metamorphic GaAs-based solar cell that claimed the ...

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  • Leakage Current In all wireless systems, if there is no data to transmit, the PA is disabled and ideally it consumes no power at all. However, unless a switch is placed in series with the supply voltage driving the PA (which is not attractive because of cost, size and power consumption), the power amplifier will always have a supply voltage applied to the collector (bipolar devices) or drain (FET devices). While the PA can be ‘turned off’, in practice there is always a small amount of leakage ...

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  • From: microwave journal by Darcy Poulin, SiGe Semiconductor Inc. Power amplifiers are important components in almost all wireless communication systems. They normally consume large amounts of power, and therefore play a critical role in battery life for mobile devices. As a rough estimate, in a typical WiMAX radio, the baseband and transceiver will consume about 600 mW, whereas the power amplifier will consume about 1.3 W. When designing a power amplifier, there are a large number of options...

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  • The 8-channel InP monolithic tunable optical router, or MOTOR, produced by University of California, Santa Barbara, scientists. The left half of the chip holds eight wavelength converter arrays, and the right holds the arrayed waveguide grating router. Credit: University of California, Santa Barbara. Researchers at the University of California, Santa Barbara have made a key step towards eliminating optical-to-electrical-to-optical conversion stages in router hardware. UCSB researchers Ste...

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  • Practical MMIC Design 2009-10-12 16:42
    超级赞的一本书,《Practical MMIC Design》,作者Steve Marsh,原先在英国Bookham公司做MMIC很多年。简单介绍一下本书的主要内容: Chapter 1: Introduction Chapter 2: Component Technology and Foundry Choice Chapter 3: Foundry Use and Economics Chapter 4: Simulation and Component Models Chapter 5: Design Chapter 6: Layout Chapter 7: Processing Technology Chapter 8: Test 可以看到,基本上是面面俱到,凡是做MMIC所要涉及的问题,这本书都会覆盖到。工艺、器件、设计仿真、版图及测试,甚至使用Foundry的流程,...

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  • New Saudi and Turkish institutions are gearing up with high-end kit, including MOCVD systems, for III-V device development and processing. Compound semiconductor research looks set to receive a boost in the unlikely Middle Eastern locations of Saudi Arabia and Turkey. The King Abdullah University of Science and Technology (KAUST), located in Jeddah and backed to the tune of $10 billion by the Arab state's leading crude oil producer Aramco, is investing heavily in semiconductor equipment. KAUS...

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  • A Bit of Radio History 2009-10-12 16:41
    1831 -- Faraday discovered electromagnetic induction between two entirely separated circuits. 1838 -- Steinheil discovered the use of the earth return. 1840 -- Henry first produced high-frequency electric oscillations and pointed out that the discharge of a condenser is oscillatory. 1842 -- Morse made wireless experiments by electric conduction through water. 1845 -- Lindsay made experiments in transmitting message across the River Tay without wires, using the water as a conductor. 1862 -...

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  • Strategy Analytics issued a report “GaAs Industry Downturns 2001 vs. 2009," where the Strategy Analytics GaAs and Compound Technologies service reiterated previous projections of a 5% - 6% drop in GaAs industry revenues for 2009, and explains why the current downturn will not be as extreme for the GaAs industry as in 2001. As SA said previously, the GaAs industry hit a wall in the last quarter of 2008. The effects of a global economic slowdown finally caught up with the handset market&m...

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  • 出关 走火入魔 2009-10-12 16:39
        ...

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  • With a common existing accelerated qualification test providing inaccurate information, representatives from a variety of compound semiconductor companies are calling for input on a standard replacement. Reliability scientists from across the power amplifier manufacturing industry are pushing for a universal qualification testing specification for laminate GaAs modules. GaAs modules after surface mount, die attach, and wire bond, prior to laminate overmolding and singulation. In these GSM...

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  • RVA2007L Combines RFMD’s Proven Leadership in Module Design and Volume Manufacturing With Legacy RF Design Capabilities of Sirenza Acquisition GREENSBORO, N.C., April 1, 2009 (GLOBE NEWSWIRE) — RF Micro Devices, Inc. (Nasdaq:RFMD), a global leader in the design and manufacture of high-performance semiconductor components, today announced the Company has received its first order to supply its highly integrated RVA2007L multi-chip modules into new multi-standard wireless base stations.  The...

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