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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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  • TI- 非常规出动”模数之外”的世界 作者:王今仁 最近大家都在谈一个有趣的事,由于现在经济危机,西天取经这个团队里要裁掉一个人,那么裁掉谁呢。 高层是唐僧,首先被排除;而最底层的沙僧工资低,还任劳任怨,裁掉没意义;只有悟空和八戒,这两个是中层,所以裁掉2个就是八戒和悟空,裁掉一个就在这两个人里面选一个。一般人都会说,裁掉八戒,毕竟留下有能力的比留下拍马屁的强;但在现实生活里,悟空可能比八戒被裁掉的可能性还大。答案是因为八戒懂得跟老板打交道,而悟空不懂。 所以,我们由此来探讨一下如何与老板打交道。 有...

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  • From: compoundsemiconductor.net Technology from the Chinese Academy of Sciences pushes rates of conversion from bulk crystals to substrates past 70 percent, lowering costs. Chinese startup Tankeblue is boasting that it can produce SiC substrates 60 percent cheaper than its competitors, thanks to its crystal growing expertise. “Very high yield and very low cost of production has been achieved,” a company spokesperson told compoundsemiconductor.net. The Beijing company credits this developme...

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  • The Nano Radio 2009-10-12 16:33
    This is not totally new news but a recent article in Scientific American has called some attention to it as researchers have built the world's tiniest radio out of a carbon nanotube. The tiny nanotube is placed between two electrodes and combines the roles of the major electrical components in a radio, including the tuner and amplifier. It can tune in to a radio signal and play the audio through an external speaker. The nanotube radio works differently than a conventional radio that has an anten...

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  • From: Microwave Journal Growing up in the GaAs market in the 80's, I like to follow how the market is doing. In its latest GaAs report, Strategy Analytics states that RFMD, Skyworks and TriQuint lead the overall GaAs device market which grew 9% year-on-year in 2008, with early estimates showing that RFMD, Skyworks and TriQuint further consolidated their leadership of the GaAs device industry, accounting for up to 59% of total GaAs industry revenues. Merchant demand for GaAs devices continues...

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  • From: compoundsemiconductor.net Leading GaAs power amplifier manufacturer RF Micro Devices is to part with over 100 more staff as it reorganizes its back-end manufacturing and operating expense structure. RFMD will now close its Shanghai test and assembly operations, combining some of the functions into its Beijing site and outsourcing others. This move is set to be completed before the end of September, although the exact impact on headcount is currently not known. However the company will ...

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