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当前状态:
座谈已结束
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| 主题: 瑞萨应用于无绳电话/FRS的高频装置 | ||
| 在线问答: | ||
| [问：seven8080] | 想了解在对讲机领域的具体应用 | |
| [答：Jacky] | Question is too board. Please specify. | [2006-3-23 10:34:13] |
| [问：pufeng] | 能否提供RF产品的布线方面的技巧和经验吗？ | |
| [答：Jacky] | Question is too board. please specify. | [2006-3-23 10:38:50] |
| [问：aeroboy1104] | What is the FRS and GMRS stand for? | |
| [答：Hiroshi] | FRS - Family Radio Service GMRS - General Mobile Radio Service | [2006-3-23 10:39:48] |
| [问：月儿] | MMIC在无绳电话上的使用,要注意什么问题?在PCB布线上有何讲究? | |
| [答：Jacky] | May you specify this question? | [2006-3-23 10:39:56] |
| [问：cc003] | 有WiMAX产品吗 | |
| [答：Michelle] | 是的，我们有Diode可以支持Wimax。 | [2006-3-23 10:41:14] |
| [问：cc003] | 你们无绳电话有什么优势？？？ | |
| [答：Hiroshi] | We provide devices to be used in cordless phone, not end-product. | [2006-3-23 10:42:48] |
| [问：jiangchengbin] | 请问用于2.4G接口的PA，只是提供模拟的部分？ | |
| [答：Jacky] | Also can be used in digital applications. | [2006-3-23 10:46:18] |
| [问：月儿] | RF产品的阻抗匹配很重要,如何达到这一点? | |
| [答：Michelle] | 这个问题很难简单的讲清楚。 事实上，RF的阻抗匹配要做以下的工作。首先要获得的RF产品的S参数，同时为了达到最好的匹配效果，也要考虑PCB的参数影响，再利用匹配软件进行匹配。选择合适的拓扑结构和合适的参数。 现在匹配软件有很多种，比如可以选择ADS或者Microwave。 | [2006-3-23 10:52:56] |
| [问：fenghao] | 制作高频晶体管的公司很多,Renesas的高频晶体管的突出优点是什么?在市场中的地位或份额如何? | |
| [答：Hiroshi] | We have around 35% share in RF MOSFET for UHF,VHF TV tuner. In this market, Philips, Infineon and Renesas are big three providers in the world. In cordless phone, we provide RF LNA transistors. Our position is not so high in this market, but for 5,8Ghz our SiGe HBT is accepted with good performaces now. In walkie Talkie market, our PW trs is just started to provide to the customers. Thank you. | [2006-3-23 10:57:13] |
| [问：yuanli25] | 封装结构对2GHz以上的功率晶体管有何影响?附加的散热器对性能影响大吗?如何安装散热器? | |
| [答：Bell] | Renesas transistor package design already considered and minimized the effect in RF applcation. Of course adding an additonal heat sink will affect the RF characteristic. So the best way is to use PCB layout to help heat dissipation. | [2006-3-23 10:59:09] |
| [问：zhangguilan] | 和ST, Philips等公司相比,Renesas用于低噪声放大器的硅锗晶体管的噪音系数和增益性能有何特别的优点? | |
| [答：Michelle] | Renesas的晶体管的工艺决定了它具有：宽频带，低噪声和高增益的优势。比如说HAxxx系列，PG＝16dB，NF＝1.5dB. | [2006-3-23 11:01:14] |
| [问：jiangchengbin] | 请问2.4G的PA，有针对zigbee/wifi的应用嘛？有没有demo board？ | |
| [答：Jacky] | Yes. currently not yet have demo board. Pls contact our sales office. | [2006-3-23 11:03:58] |
| [问：pufeng] | 在VHF和UHF频段，Renesas现在能提供的最高功率的功率放大管有那些? | |
| [答：Hiroshi] | We are providind PW Amp devices for 800MHz mobile use and 400-500MHz walkie-Talkie. Highest Po is around 7W. | [2006-3-23 11:03:58] |
| [问：suquan] | 请问贵公司的新产品目前在网上可以找到资料吗？ | |
| [答：Michelle] | Some can be found. | [2006-3-23 11:05:32] |
| [问：aeroboy1104] | Renesas的高频晶体管能工作在5GHz还是2.4GHz频段?主要是用在数字无绳电话还是模拟无绳电话? | |
| [答：Jacky] | for both 2.4G & 5.8G. and also for both analog & digital; such as PA, LNA, etc. | [2006-3-23 11:08:35] |
| [问：catdad] | 请问在降低高频分立器件的功耗方面，瑞萨有什么独特的技术？ | |
| [答：Jacky] | Pls contact our engineer. | [2006-3-23 11:09:28] |
| [问：w.liu] | 硅锗工艺的器件的工作温度范围是多少? | |
| [答：Bell] | -10 ~ 85oC | [2006-3-23 11:09:56] |
| [问：MB45] | Renesas有变容二极管吗?它的电容变化比最大有多大? | |
| [答：Michelle] | Yes. Can up to 17min. | [2006-3-23 11:10:01] |
| [问：RCLLYL] | Renesas用在2.4GHz数字无绳电话机上有那些具体的产品型号?可提供完整的电路方案吗? | |
| [答：Hiroshi] | For LNA, Buffer, F-conv, we are selling 2SC5594, 2SC5812, 2SC5849, HSG1001, RQG1001 and HSG1003. We can not provide full circuit solution. | [2006-3-23 11:10:40] |
| [问：liuaiming] | 2SC5945的信噪比？ | |
| [答：Michelle] | You May find all performance in the below link. http://documentation.renesas.com/eng/products /transistor/rej03g0443_2sc5945.pdf | [2006-3-23 11:16:39] |
| [问：fenghao] | 采用分立高频晶体管设计无绳电话完整的放大器电路,如何选择这三级中的晶体管?级间的耦合,放大倍数以及阻抗匹配应如何考虑? | |
| [答：Michelle] | The question is too board.Pls contact us for detail. Of course you can refer to another answer to the impedance matching. We also provide some solutioins and Demo board. | [2006-3-23 11:26:40] |
| [问：ltf3748] | 有 20A的MOSEFET吗？相应的驱动芯片有吗，什么型号，价位怎样？ | |
| [答：Bell] | Yes, Renesas has a full line-up of power MOSFET! Please contact our sales office for more details! | [2006-3-23 11:26:59] |
| [问：sunzhg] | 请问目前限制RF性能提高的因素，除了工艺之外，主要的技术门槛在那里？ | |
| [答：Jacky] | Please contact our engineer. | [2006-3-23 11:27:03] |
| [问：RCLLYL] | Renesas的低噪音晶体管,噪音电平能达到多少?和其它公司相比,有何特点? | |
| [答：Jacky] | depand on frequency, such as our HSG1002 is at 1.2dB@5.8G. | [2006-3-23 11:31:48] |
| [问：linghz] | REnesas的高频分立器件能否同时用于数字无绳和模拟无绳电话机? 能否提供参考电路设计? | |
| [答：Jacky] | Yes. We have circuit diagrams for reference. | [2006-3-23 11:33:10] |
| [问：yuanli25] | 请问功率MOSFET在500MHz时能达到最大的输出功率有多高? | |
| [答：Jacky] | We have RQA0002, up to Pout at ~7W (or 38dBm). | [2006-3-23 11:35:28] |
| [问：kxmxdbx] | 在设计RF中，如何保证同一批电路板在频率发射接收上尽量接近? | |
| [答：Jacky] | Plsease contact our engineer for consultations. | [2006-3-23 11:38:48] |
| [问：MB45] | RF双栅极MOS FET和一般MOSFET在性能上有何不同?主要用在什么领域? | |
| [答：Bell] | For high frequency usage, the in/out capacitance (Ci, Co) must be small. And Transconductance (Gm) should be large. Nomral MOSFET, the major parameter is the Rds_on and Id and thermal resistance Rth. | [2006-3-23 11:39:42] |
| [问：上官雁] | 请问你们有提供免费的无绳电话的方案吗?在你们的网站上可不可以下载到. | |
| [答：Jacky] | We have cuicuit diagrams for reference, but not available at web. | [2006-3-23 11:39:55] |
| [问：pufeng] | 2.4GHz无绳电话在PCB布局上需要注意的问题有那些? | |
| [答：Jacky] | Please contact our engineer for consultations. | [2006-3-23 11:40:29] |
| [问：gwtaa] | 在宽带放大器中，电压反馈型与电流反馈型对晶体管的要求有什么不同？ | |
| [答：Bell] | Voltage feedback and Current feedback are just different topologies. Voltage feedback circuit is easier to be designed, and current feedback has faster response. | [2006-3-23 11:43:59] |
| [问：月儿] | 如何进行MMIC的设计?有无仿真软件? | |
| [答：Jacky] | It"s too board. please specify. | [2006-3-23 11:49:51] |
| [问：gwtaa] | 2.4G频段电感耦合与电容耦合放大器的频响哪个比较好些？ | |
| [答：Jacky] | Depand on circuit design, and what devices used. | [2006-3-23 11:52:58] |
| [问：xinfa] | 一般采用分立器件的NF性能要比采用MMIC要好一些，Renesas的MMIC产品NF性能如何？怎么改进NF性能？ | |
| [答：Michelle] | 我们的产品具有宽频带，高增益和低噪声的特性。 不同产品的NF不同，1.1dB~1.5dB都有。 选择合适的匹配阻抗可以提高NF。 | [2006-3-23 11:53:40] |
| [问：inverter] | 高频管的应用及工作原理 | |
| [答：Jacky] | too board. pls specify. | [2006-3-23 11:54:15] |
| [问：zhangguilan] | 请介绍RF分立晶体管的主要技术参数及如何使用它? | |
| [答：Bell] | Different device has different parameters suitable for different application. Please refer to the presentation material for brief introduction. If you want more details, please contact to our local sales office. | [2006-3-23 11:54:21] |
| [主持人：ChinaECNet] | 所有问题均已提交给Renesas公司的专家。座谈期间未回答的问题，Renesas公司专家也会逐一回答，并在中电网上公布，请大家注意收看。 | [2006-3-23 11:54:54] |
| [问：hncjs] | 支持2.4g吗？ | |
| [答：Jacky] | Yes. such as 2SC5594, 2SC5821, HSG2001, etc. | [2006-3-23 11:56:39] |
| [问：Ho Chee Wei] | During program running, apart form JMP instruction,what instruction will make the pre-fetch queue will be flushed? | |
| [答：Jacky] | it"s MCU related. | [2006-3-23 11:57:52] |
| [问：aeroboy1104] | 高频晶体管是否包括成套的放大器器件,包括低噪音输入级,中间级和最后功率放大级? | |
| [答：Bell] | No, high frequency transistors are those fundamental components of building up the amplifiers, not vice versa. | [2006-3-23 11:59:42] |
| [问：yuanlin] | 在工业控制中有何应用？ | |
| [答：Michelle] | 我们的产品有使用在FRS、Walkie Talkie和Cordless Phon中。 | [2006-3-23 12:00:05] |
| [主持人：ChinaECNet] | 恭喜您， 大唐电信成都光通信分公司的fenghao经过电脑抽奖您在本次座谈中获得一部MP4播放器。请网名为fenghao的用户与中电网联系(8610-82888222-7008 或 lilin@chinaecnet.com)。 | [2006-3-23 12:02:25] |
| [主持人：ChinaECNet] | 在此，中电网特别感谢给予本次中电网在线座谈巨大支持的Renesas公司，特别感谢专门在线回答各位听众（网友）提问的Renesas公司的各位专家们，特别感谢各位听众（网友）积极热情的参与。 | [2006-3-23 12:02:38] |
| [主持人：ChinaECNet] | 祝大家事业有成、生活愉快！欢迎多提宝贵意见，欢迎关注中电网，下次再见。 | [2006-3-23 12:02:47] |
| [问：linghz] | Renesas新型SiGe及Si双极晶体管的主要参数及突出特性有那些? | |
| [答：Michelle] | SiGe是是一种能使宽带通信应用的成本、性能、可制造性和电源管理要求达到最佳平衡的新材料。它主要的特性是低噪声。 同时它可以用Bi-Cmos来集成。 | [2006-3-23 12:06:16] |
| [问：] | 能给我们介绍一下瑞萨的MCU系列吗例如7055系列 | |
| [答：] | 今天我们的重点是Transistor。关于MCU的问题可以和我们的办事处联系。 | |
| [问：] | 请问瑞萨有没有pA级弱信号放大的晶体管?有没有推荐电路? | |
| [答：] | 对于弱信号的放大我们称之为Pre－drive。瑞萨有这样的产品。 | |
| [问：] | 请问瑞萨有没有对讲机领域的解决方案,具体的芯片组是什么?谢谢 | |
| [答：] | Yes.We have the RF Front solutions. You can contact our sales office for detail inf. | |
| [问：] | 就无绳电话而言,2.4GHz和5GHz在性能上有何差别? | |
| [答：] | 5.8GHz使用频带较宽，信号效果较好。 | |
| [问：] | 如何降低功放级的失真以提高无绳电话的音质?在选管时要注意那些特性? | |
| [答：] | In order to loewr the distortion, transistor's maximum collector current (Ic) should be higher, thermo resistance (Rth) should be lower.P1dB should be larger. | |
| [问：] | 有8位的数模转换芯片吗，型号是什么？大体价位是多少？ | |
| [答：] | Current not yet. | |
| [问：] | 无绳电话的输出和接收频率是多少？ 谢谢 | |
| [答：] | For 2.4GHz, transmit Freq. 2.4G; Receive Freq. 900M;For 5.8GHz,transmit Freq. 5.8G; Receive Freq. 900M | |
| [问：] | 高频段宽带与窄带放大器对晶体管有什么不同的要求? | |
| [答：] | Theoretically, there is no different between Wideband or Narrowband requirements in high frequency design. | |
| [问：] | 能否介绍电压控制振荡器(VCO)的工作原理和适用的振荡频率? | |
| [答：] | There are many text books talking about VCO theory and design concern. If you want any suggestion, please feel free to contact sales office engineers. | |
| [问：] | 砷化镓与瑞萨的高频晶体管各有什么特点！ | |
| [答：] | GeAs devices have very high gain, low noise at very high frequency (>12GHz range). Renesas has SiGe, which is a little bit lower operating frequency (~6GHz) but much cheaper than GeAs. | |
| [问：] | 那么它在ZEEGBI中也是一样可以使用的是吗? | |
| [答：] | Yes! | |
| [问：] | 想请问一下国内目前的工艺线是否有加工MMIC的能力？ | |
| [答：] | We guess not. | |
| [问：] | 使用MMIC时,需要注意那些方面以降低PCB寄生参数的影响? | |
| [答：] | Please contact our local engineer. | |
| [问：] | 如何在把RF性能发挥到最好的同时，提高MMIC集成电路的EMC特性？ | |
| [答：] | Please contact our local engineer. | |
| [问：] | 我想知道emc能不能达到要求 | |
| [答：] | Depand on circuit design. | |
| [问：] | 能提供ADS或其他EDA的Library吗? | |
| [答：] | Probably not. | |
| [问：] | 你们有可以用单片机控制的数字通讯集成电路或方案吗？ | |
| [答：] | Yes. Please visit our website at www.renesas.com | |
| [问：] | 请问瑞萨有支持TD的方案吗？功耗如何。 | |
| [答：] | Do you mean "TD" is TDS-CDMA? Yes. We have solutions for TDS-CDMA applications. | |
| [问：] | MMIC器件的价格相对还是比较高，Renesas在价格方面是什么策略？ | |
| [答：] | In term of pricing, we provide competitive prices for targeted applications. | |
| [问：] | Could you pls tell me what MMIC ? Thanks | |
| [答：] | Micro Monolithic Integrated Circuit | |
| [问：] | 使用中RF MOSFET容易烧毁，设计时最重要的要注意什么以确保可靠性？ | |
| [答：] | Actually MOSFET is sensitive to surge noise and ESD. So good system design should has this kind of surge and ESD protection. Renesas has a full line-up of surge and ESD protection diodes for this applicaiton. | |
| [问：] | Renesas RF产品应用范围，信澡比和温飘情况如何？ | |
| [答：] | Based on circuit design, like ~1dB@5.8G. | |
| [问：] | 能否介绍一下MMIC的测量技术和所用的主要仪表? | |
| [答：] | Case by case. | |
| [问：] | 在小信号的设计中，器件的的非线性是不是可以考虑较少？ | |
| [答：] | Case by case. | |
| [问：] | 怎样降低放大器的噪音？ | |
| [答：] | Have answered before. | |
| [问：] | 能否简介或者提供最新器件的封装说明？ | |
| [答：] | It can be found in our homepage. | |
| [问：] | 贵公司有那些大功率的RF宽带功放，输出可达10W以上？ | |
| [答：] | No. We currently only have upto ~8W. | |
| [问：] | Renesas的RF解决方案中有没有专为汽车电子使用的产品及方案？ | |
| [答：] | Not yet. | |
| [问：] | 关于无线数字TV调谐产品,请问Renesas目前是否有硅TURNER芯片. | |
| [答：] | Not yet. | |
| [问：] | 请问RF的阻抗匹配参数是怎么计算的啊 ？？ | |
| [答：] | Please refer to textbook, or related documents. | |
| [问：] | 贵公司的有哪些RF产品可以应用在手机设计上? | |
| [答：] | Renesas有HPA，RFIC和FEM可用在手机上。 | |
| [问：] | 贵公司所提供的器件是否提供仿真模型以供仿真？ | |
| [答：] | S Parameter can be provided. | |
| [问：] | RF放大器的地在PCB排版设计中如果需要隔离同后端大信号，该如何进行？ | |
| [答：] | Same as above-mentioned question. | |
| [问：] | 设计MMIC时,需要注意那些方面以降低PCB寄生参数的影响?如何布局? | |
| [答：] | Same as above-mentioned question. | |
| [问：] | 请问，在PCB上如何合理设计RF电路才能更理想？ | |
| [答：] | There are many technique involved. If you want more details, please contact our sales office. | |
| [问：] | 请问在射频通信中如何抑制谐波以及减小相位误差？ | |
| [答：] | There are many technique involved. If you want more details, please contact our sales office. | |
| [问：] | Renesas用在Wi-Fi的器件有那些?能举例说明吗? | |
| [答：] | We have diodes, transistors, etc. for Wi-Fi applications. | |
| [问：] | 如何选择推挽输出的两个晶体管以扩大输出功率?要考虑到那些因素? | |
| [答：] | We have many solutions for different power out. You can contact us directly to get the relevant solution. | |
| [问：] | MMIC中的过载保护问题如何处理? | |
| [答：] | ||
| [问：] | Renesas有无用于RF技术的动态电压功率管理器件?其型号如何？ | |
| [答：] | ||
| [问：] | RF放大器中如何选择和解决去耦问题?级间耦合采用DC和AC有何优缺点? | |
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| [问：] | RF接地中,通过区域听分隔来提高隔离度,哪数字地和RF地是通过点连接还是大面积直接边接即可? | |
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| [问：] | RF宽带晶体管的低频和高频性能如何?总的带宽目前能达到多高? | |
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| [问：] | RF输出级如何和天线的阻抗匹配以达到最佳的发送?接收级呢? | |
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| [问：] | 本厂开发无线短距通讯（语音），能否提供技术支持？用贵公司的收发器单片机等组成收发电路，如果同意提供技术方案，该怎么联系，谢谢！ | |
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| [问：] | 采用RF分立器件设计放大器时，在电路上如何进行级间的调整?应注意哪些问题？ | |
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| [问：] | 我最近试制RF产品在受热时,在受热受时载噪比下降,请指点如何提高RF载噪比?谢谢 | |
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| [问：] | 在RF 设计过程中,匹配算法大家都会,问题是对 某一晶体管在一定偏置条件下如何快捷取得使用频点对应的输入阻抗? | |
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| [问：] | 在制作PCB时，对LNB和功率输出级应如何布置和布线?有些什么特别要求？ | |
| [答：] | ||
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