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  • Power Amplifier Classes 2009-10-12 16:28
    Ideal FET Input and Output      Maximum Output Power Match    ...

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  • From: compoundsemiconductor.net Last week's announcement that China will adopt three different broadband wireless protocols presents the major GaAs players with new opportunities. GaAs companies have welcomed the recent decision by China's Ministry of Industry and Information to roll out three broadband wireless protocols in the country, believing that the move offers up a major new commercial opportunity. On January 7, the ministry approved licenses for China Mobile Communications, Chi...

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  • HILLSBORO, OR & SAN DIEGO, CA (USA) – November 17, 2008 – TriQuint Semiconductor, Inc (NASDAQ: TQNT), a leading RF front-end product manufacturer and foundry services provider, today announced the availability of a revolutionary new high power discrete RF transistor family for broadband applications including radar, signal jammers and wireless communications. TriQuint’s new PowerBand™ family was unveiled today at the MILCOM military communications conference and exhibition at the San Die...

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  • The Portland, Oregon, based RF semiconductor company will imminently start addressing strong demand for its HV-HBT cellular base station amplifiers. TriQuint Semiconductor is to start commercial production early in 2009 on GaAs amplifier products that have recently claimed a cellular base station efficiency record. Low-volume initial production will begin on high-voltage HBT (HV-HBT) devices and ramp into 2010 in response to a strong interest in the technology’s power-saving potent...

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  • From: http://www.mindmeters.com/showlog.asp?log_id=8650 By [ 申音 ] 很长一段时间,我对国内IC设计产业的困境感到迷惑不解。 在这个产业里,聚集了中国最聪明的头脑(其中绝大多数是海归精英)。政府很舍得花钱支持,VC也很重视,有硅谷的成熟商业模式,又背靠全球最大的移动通信和消费电子市场。但事实很悲哀,远在整个经济的冬天到来之前,这个产业就处在集体委靡之中。不断有公司倒闭的消息,仅有的三家海外上市公司,有两家——中星微(Nasdaq:VIMC)和展讯(Nasdaq:SPRD)都处于亏损之中,市值甚至远远不到1亿美元。 上个月...

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  • Skyworks vs. Anadigics 2009-10-12 16:18
    刚刚看了RSS聚合过来的新闻,正好此刻头疼欲裂,所以可以有借口挤点时间更新一篇Blog。两条新闻,一条关于Anadigics的裁员计划;另一条则是Skyworks的季度财报利好: Anadigics: GaAs chipmaker Anadigics is to lay off 15 percent of its workforce, following the misfiring of some of its 2008 production ramp-ups.On November 5, approximately 100 employees learned that they will be leaving the Warren, New Jersey based company's global operations within days. Skyworks: The Woburn, Massachusetts, headquartered comp...

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  • 所里发了票,所以上周五跑到新国展看了通信展。首先想说的就是,那个地方真远,地铁五号线坐到天通苑北,然后乘坐免费班车还要走将近帮个小时才到,几乎就要到了机场。中子家的豪宅就坐落在那里不远,步行十分钟左右,可惜那里真的很荒凉。     咱们本身不是搞通信的,只能算是与通信相关,所以N多企业的展台都可以无视,是冲着RFMD和Anadigics...

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  •   终于被我师兄找到了这本书的电子版,而且是非常清晰。好东西怎能独享?放出来奇书共赏之: 《RF Power Amplifiers for Wireless Communications》 最近在看Steven Cripps的领完一本书,advanced。因为做了好几天财务工作,动作慢了很多。再次提醒给为同仁,看这位老先生的书,一定要有心理准备。Good luck. 还欠下了几篇早就构思好的话题。

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  • Feedback conflict 2009-10-12 16:12
    1. Feedback, a technique that has been used with much success, attempts a basic causal contradiction: after an event has occured, reshape its cause; this violation may only be resolved by time smearing the event to blur the distinction between "before" and "after" to an adequate degree. 2.  Feedback, in comparing input with output, glosses over the fundamental distinction that input and output are not simultaneous events and therefore, not truly capable of direct comparison. In practi...

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  • 西湖踏歌 2009-10-12 16:10
    八月十八的钱塘江潮,没有赶上。不过,桂花初开的满陇晨雨,却被我抓个正着。按照我们可爱的小强导游的话,现在的满陇桂花,已经开了百分之三到百分之六。尽管未到全盛之时,我们下榻的杭州海华满陇度假酒店所在的满觉陇村,已经高朋满座。无论是各家酒店还是附近山民,纷纷在桂花之下摆好了藤椅,沏好了西湖龙井,招待来自四海五湖的游客。 这是一个美丽的季节,北京已经开始有了帝城之秋的味道,而杭州仍然骄阳似火,湿热难耐。今年的Agilent EESof用户大会,就摆在了美丽的西湖之畔。而我,也从而有机会踏上这片留下无数美丽传说异或故...

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  • DDS Output Wave 2009-10-12 16:05
      It's an ultra-high speed Direct Digital frequency-Synthesizer (DDS) with clock frequency of more than 5GHz. The architecture is ROM-less with a sine-weighted nonlinear DAC insteading of the traditional ROM for phase-magnitude convertion. While this can improve the speed of taotal DDS circuit, it can't give as high SFDR as ROM-with architecture does. However, look at the output wave, with 5GHz clock frequency and Frequency-Control-Word of 1, the simulation result show a well-look 19....

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  • Accumulator + Encoder 2009-10-12 16:03
  • EMDS for ADS 2009-10-12 16:00
    The integrated 3D electromagnetic analysis capabilities in Advanced Design System 2008, Update 2, eliminate the need for standalone EM tools and improve productivity. Credit: Agilent EEsof.

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  • 前天Agilent公司来讲座“基于PNA-X的非线性矢量网络分析仪”。众所周知,S参数是小信号的线性参数,所以对于表征器件的特性--尤其是大功率器件来说不是特别精确;而大信号的参数获取,则通常要借助于Load-pull和功率计等测量仪器和手段。这个非线性矢量网络分析仪(NVNA),则可以测量器件的很多非线性特性,它的基本应用包括: 基于矢量校准的示波器; 频域测量; 直流脉冲测量; 射频脉冲测量; 多音激励测量; 多包络域测量; Real HotS22测量; X参数测量和非线性模型提取; ... NVNA提供了“N in 1”的功能--集成更多的功能,而不仅仅...

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  • 毫米波频段是满足日益强烈的高精度探测及高速率数据通信要求的关键资源。继8毫米波段(26.5~40GHz)之后,3毫米波段(75~111GHz)成为世界各国高频技术竞争的制高点。基于固态半导体技术的毫米波单片集成电路(MMIC)由于具有体积小、重量轻、高性能及低成本等优势而被广泛应用于军事和民用领域。InP基异质结双极型晶体管是实现3毫米波段MMIC应用最主要的固态半导体器件,是国际工业界和学术界研究的热点;但由于其高技术门槛,所以目前只有美国和日本等少数发达国家掌握了相关工艺技术。 中国科学院微电子研究所金智研究组对InGaAs/In...

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