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  • 我们开发的4英寸InGaP/GaAs HBT MMIC工艺流程。每一个步骤都有大量的实验和数据支持,已经非常成熟。 A. 制作对准标记。溅射金属Ti/W。在溅射金属之前,要用酸性腐蚀液对4 英寸外延片表面进行处理,否则标记金属容易起皱脱落。另外,在后面的工艺步骤中要注意对标记进行保护。 B.  蒸发发射极金属Ti/Pt/Au,Ti,Pt 和Au 分别为黏附层、阻挡层、导电层。InGaAs 和金属之间的接触势垒非常低,只要金属能和半导体良好浸润,紧密接触,就能形成欧姆接触,属于非合金欧姆接触。同时此金属将作为发射极腐蚀的掩膜。 C. 发射极台面腐蚀。...

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  •   HBT、HEMT是微波毫米波领域中非常重要的高速固态器件,其中HBT由于具有功率密度和增益高、相位噪声低、线性度好、单电源工作、芯片面积小和价格性能比低等特点,已经逐步发展为MMIC领域中一个非常有竞争力的技术。目前,HBT已被广泛应用于高速光通信系统,如光调制驱动电路、时钟提取、数据恢复、MUX/DEMUX和光接收机电路。 HBT与HEMT比较,具有以下几个方面的优势: (1)HBT是一种电流方向垂直于器件表面的双极型器件,器件速度由外延层的厚度和掺杂水平决定。目前采用先进的外延生长技术(MBE和MOCVD)能够生长单原子层精...

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  • GaAs Magnetic Memory 2009-10-12 15:00
    The evolution of GaAs into an alternative to silicon in memory technology has progressed a step further, with BAE Systems making an investment in Micromem. The defense contractor is now assessing Micromem’s technology in its Nashua, New Hampshire, 6-inch GaAs fab for memory and detection applications. According to Steven Van Fleet, a director at Micromem, BAE Systems will have decided production plans for the technology by summer 2008. At this point BAE will return to follow up its investme...

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  • Originally, pulsed-RF test systems were needed to test devices opearting at power levels higher than those which could be continuously tolerated without destruction of the devices, such as occur in radar systems. Subsequently, pulsed measurements were used simply to measure device parameters at anticipated signal levels to assist in the design of circuits for pulsed operation. More recently, pulsed measurements have been used to characterise devices to assist in devising and subsequently fitting...

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  • III-V 化合物半导体 2009-10-12 14:59
    Compound semiconductors are critical to the operation of many electronic and optoelectronic systems including mobile telephony systems, satellite communications and power systems, automotive applications, and more. Because of its unique properties, compound semiconductors have emerged as key enabling materials in facilitating the dramatic advancements and improvements in these industries. Unlike silicon, which is a single element semiconductor and, therefore, has a fixed set of inherent electro...

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  • 转移衬底的问题 2009-10-12 14:57
    The transition from to mesa device topology was motivated by the following issues with the transferred substrate process. The dominate failure mechanism associated with the TS-process have to do with the substrate removal steps. After the device and circuit formation is complete, BCB coasts the wafer and vias are etched for the subsequent electroplating of a 5um thick ground plane. At this point a GaAS or AlN carrier wafer was soldered against the ground plane. Often the BCB cracks because of...

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  • Field programmable analog arrays (FPAAs) Full-custom analog design of integrated circuits is time-consuming and their verification expensive. Many attempts have been made to apply rapid-prototyping techniques known from the digital domain to analog designs. The goal of the presented work is to develop an FPAA, which is suitable for reconfigurable implementation of analog continuous-time (CT) high-frequency filters on an integrated circuit. This would enable designers to immediately verify th...

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  • TI的最新策略 2009-10-12 14:52
    From EETChina.com 事实上, TI在2008年已做好准备向竞争对手重新发动攻击,尤其是针对它的“眼中钉”:无晶圆厂竞争对手博通、MTK和高通。此外,数家集成器件制造商(IDM),如飞思卡尔、英飞凌、NEC、NXP和意法半导体,也将同时角逐基带芯片市场。 TI准备推出新的芯片系列来迎战,逐渐展开其“混合”或轻晶圆厂制造策略,并向新的研发模式转型。这些举措中的一部分旨在降低制造成本,使公司成为更具应变能力的竞争者。 此外,TI似乎已经改变了它在逻辑器件(包括基带器件)方面的策略基调。曾几何时,这家芯片厂商还在大肆吹捧其先进的逻...

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  • 太赫兹晶体管 2009-10-12 14:49
    From compoundsemiconductor.net It's the simple goals that tend to capture our imagination, such as the breaking of the four-minute mile and the first ascent of Everest. In our community we also have a similar goal – the building of the first semiconductor chip that can operate at 1 THz. This target is particularly interesting because it is being attacked on two fronts by strikingly different technologies. Quantum cascade lasers (QCLs) are making gains from the optical side as researchers bu...

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  • Pico-projector 2009-10-12 14:38
    想想,你的手机可以将其中的Pic或者PPT投影到墙壁上,是多么炫!这就是所谓的Pico-projector,即皮投影仪。早就听闻了Ti的DLP(Dynamic Light Projection)技术--已在Barcelona展出,但是迟迟没有产品推出。这是一个诱人的市场,可以由于成本的原因,还没有成熟到可以推到市场。不过,那个日子一定不远了。 说起光电技术,其实化合物半导体是很重要的角色。LED,光互连,激光--甚至激光驱动器,都有化合物半导体的影子。这个市场非常庞大,科研上前途也很光明,可惜呀--难言! Luminus Devices' experience comes from its devel...

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  • RFMD研发“内幕” 2009-10-12 14:36
    Vic Steel is looking to keep RFMD ahead of the rest of the GaAs field with MEMS for RF switch integration in handsets and an unexpected foray into photovoltaics. The company's vice-president of corporate R&D shares his game plan with Andy Extance. Which is the single most important technology currently in development at RFMD? Of course, I would say they're all important, so that's a hard question. I think our MEMS technology has the best potential to revolutionize several aspects of o...

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  • From: compoundsemiconductor.cnet TriQuint to acquire WJ Communications for $72m More GaAs consolidation on the cards, as WJ product innovation expands TriQuint's RF/Analog product portfolio and RF module capability HILLSBORO, Ore.--(BUSINESS WIRE)--TriQuint Semiconductor (NASDAQ:TQNT), a leading RF supplier to the wireless communications industry and WJ Communications, Inc. (NASDAQ:WJCI), today announced a definitive agreement for TriQuint to acquire WJ. WJ is a leading supplier of radio fre...

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  • Optichron 2009-10-12 14:34
    IIC-China 2008北京站,来捧场的公司太少了,大公司更少,远没有前年那么热闹了。不过还是发现了很感兴趣的东西。譬如说,美国Optichron,一个专门做PA的数字预失真(DPD:Digital Pre-Distortion)和峰值因素衰减(CFR:Crest Fator Reduction)芯片的小公司。他目前一共只推出两款芯片:OP5000和OP4400。关于PA的线性化,目前在无线通信领域中基本上都是用前馈和数字预失真,而前馈方案由于在输出功率上的优势所以占据叫数字预失真更大的市场。但是数字预失真技术的“数字化”,它正获得越来越多的应用。数字预失真的基本原理是用多...

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  • TriQuint 2009-10-12 14:32
    From eetchina.com 去年四季度,一场手机射频PA短缺的风波在中国漫延,瑞萨是这场PA短缺风波中的主角,因为联发科平台上主要采用了该公司的PA,据悉市场缺口达到了40%,部分PA在灰色市场被抄到原价的两倍;此外,用于3G手机,比如WCDMA/HSDPA的PA也出现全面告急,原因为主要供应商ANADIGICS没有预测到不同市场的终端设备同时出现对多个PA的需求,于是产能严重短缺。 “采用我们PA的用户不会出现这种情况。”TriQuint亚太区销售总监林伟仪对《国际电子商情》记者表示,“这正是越来越多的用户喜欢与我们合作的原因。&rdqu...

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  • 再次表达一下对Steve C. Cripps的景仰,滔滔江水......最近抓紧时间研读他的第二版《RF Power Amplifiers for Wireless Communications》,很多原先比较模糊的概念变得清晰起来,可谓获益匪浅。写了几篇小小的读书笔记,仅仅是将人家的东西自己敲了一遍。分为几个不同的专题,这样做既使自己加深了映像,也可以备日后温习。好东西不可独享,放在这里抛砖引玉。希望对一些朋友用些用处,更希望高手们批评指正,大家共同进步。 1. 《

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