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| 主题：飞利浦特殊用途模拟器件介绍 | ||
| 在线问答： | ||
| [问：johnling] | 1400W的低频放大器,选择那种器件? | |
| [答：Ray] | Sorry, our product line don"t have so large power amp now. | [2005-6-28 10:32:56] |
| [问：epu127] | 音频功率放大器，负载为8欧扬声器，请问能否提供一种可靠计算扬声器上消耗的功率？ | |
| [答：Harry] | Output power may be calculated using one of two methods: 1) Po is the square of the RMS output voltage divided by the load resistance. or 2) Po is the output current squared multipled by the load resistance. | [2005-6-28 10:33:51] |
| [问：wkan] | 我现在正在用tea5767hn做一个收音机。您能否给我推荐一款与tea5767匹配的低功耗、价格便宜的音频放大器，并讲解一下它们之间怎么匹配？谢谢。 | |
| [答：Jef] | 如果用耳机驱动的话我们有TDA1308D可以使用，效果很不错，如果驱动小功率扬声器的我们有TDA8542AT可以满足你的要求，你可以从我们的网站上找到相关的资料会告诉你怎马匹配的 | [2005-6-28 10:34:05] |
| [主持人：ChinaECNet] | 在此回答问题的专家是Philips公司的：Joseph Chang，Craig Zhang，Jan Olander，Ray Xia，Jef Hou和Harry Swanson。 | [2005-6-28 10:34:20] |
| [问：yannian_zhu] | SA5211的频响曲线？可否能否提供SA5211的datasheet？ | |
| [答：Jef] | no problems, my email address: jef.hou@philips.com | [2005-6-28 10:38:12] |
| [问：shaolei555] | 对于ne568a锁相环芯片，当信号频率在其捕捉范围内发生突变，比如50MHz突变到100MHz，则捕捉时间为多少？ | |
| [答：Harry] | This is DOD device (i.e. we no longer provide it). However, the capture time depends on the loop filter characteristics. I need more information to answer this question more fully. | [2005-6-28 10:39:45] |
| [问：fourier] | 我现在用到低噪声放大器,400M左右,您能给我推荐型号吗,如何得到仿真模型(ADS软件包)? 谢谢! | |
| [答：Jef] | sorry, we don"t have LAN products. | [2005-6-28 10:40:05] |
| [问：dloco] | 能给出最简单的语音发送接收电路吗，是不是那个婴儿监视电路？ | |
| [答：Ray] | Yes, the audio receiver of baby monitor is a simple structure, which has the fix frequency. | [2005-6-28 10:40:26] |
| [问：coimhuang] | 请问一下，你们有没有带宽在2GHz左右的运算放大器？ | |
| [答：Ray] | Sorry, we don"t have the 2GHz BW OP now. | [2005-6-28 10:42:10] |
| [问：Jency] | 2w的音频放大器能否推荐一个，价格大约多少？布线上面要注意些什么？谢谢 | |
| [答：Jef] | 双声道的我们有TDA8542AT, 2x1.5w，layout可以参考我们的应用手册，从philips的网站可以下载 | [2005-6-28 10:43:03] |
| [问：epu127] | 现在很多的消费类电子带有耳机输出功能，以驱动16，32等欧姆电阻，请问如何计算耳上消耗的功率？及业内有无耳机输出测试标准？如测：信噪比，失真加噪声，动态等。 | |
| [答：Harry] | Output power is dependent upon load resistance, output voltage swing and at what THD specification is used. Usually, 10% THD is used for speaker amplifiers as a worse case condition. and the output voltage swing is measured in RMS value. Pout is output voltage squared divided by the load resistance. | [2005-6-28 10:44:09] |
| [主持人：ChinaECNet] | 我们已经进入问答阶段如果听众想重温演讲或内容可以点击下面“回顾演示”重看演讲。 | [2005-6-28 10:45:52] |
| [主持人：ChinaECNet] | 各位观众，现在用户提问很踊跃，专家正在逐一回答。请耐心等待您问题的答案，同一问题请不要多次提交。 | [2005-6-28 10:46:27] |
| [问：riello] | 现在的MP3播放器,是否都是采用D类放大器? | |
| [答：Ray] | Just some, not all | [2005-6-28 10:46:33] |
| [问：dloco] | 关于语音无限传送的安全保密philips有什么方案提供吗 ，谢谢 | |
| [答：Harry] | In more complex systems that employ baseband protocol such as frequency hopping spread spectrum (FHSS) or Direct Digital Spread Spectrum (DDSS), we have baseband chipsets such as the SA5250. Encryption may be done at the modulation level using various schemes such as CVSD (Continuous Variable Slope Delta) modulation. This is the encryption used in Bluetooth and it is offered in the Bluetooth baseband chip set. | [2005-6-28 10:50:52] |
| [问：tom_ewig] | AB类BTL音频放大器,我司用了很都（TDA8571、TDA7384）4*40W、4*25W等车载功放，可现在发热较大，导致机器高温过不了。贵公司有高效率的可以代替或改进吗？控制温度在100℃以下，如有解决的平台还恳请相关人员发MAIL告知，MAIL：tom_ewig@avl.com.cn 谢谢 | |
| [答：Jef] | 抱歉，这个产品不在我们负责范围内，我会将你的问题转交给相关的部门，谢谢！ | [2005-6-28 10:52:18] |
| [问：zhxs] | 请问，该公司是否有集成无线接收与发射和功率放大为一体的集成IC，且提供通用的串口，最高的串口速率支持多大 | |
| [答：Ray] | Currently we don"t have the single integrated transceiver IC, but we have development plan for the single chip transceiver now. | [2005-6-28 10:55:15] |
| [问：DirectCG] | 音频系统中的干扰源有那些?如何来降低它?在设计上要应注意什么? | |
| [答：Harry] | Usually, an audio amplifier functions with better THD at lower power. There is a power output level or range where THD is minimal in any amplifier. This is usually shown in the characterization curves. In most vendor devices the power output is rated at 10% THD. But <0.5% THD is possible in most consumer grade audio amplifiers. | [2005-6-28 10:55:22] |
| [问：songcaihua] | 我公司正设计微功耗无线水表,要求１０mw发射，接收－１１０dbu,２安时电池工作１０年以上，成本在５０元人民币以下，如何选配？ | |
| [答：Ray] | Philips has the wireless meter reader solution, please contact us after the web seminar. | [2005-6-28 10:57:45] |
| [问：lbgy] | 无滤波器D类放大器采用什么技术来保证THD+N的性能? | |
| [答：Jef] | Which technics used in D Class Amplifier with no filter to ensure that the THD+N is good? | [2005-6-28 11:03:49] |
| [主持人：ChinaECNet] | 各位观众，现在用户提问很踊跃，专家正在逐一回答。请耐心等待您问题的答案，同一问题请不要多次提交。 | [2005-6-28 11:06:33] |
| [问：riello] | 能否介绍D类放大器和AB类放大器的优缺点和应用? | |
| [答：Jef] | 这里有一篇文章介绍得很详细http://www.eetchina.com/ART _8800336845_617703_fb1780e1.HTM | [2005-6-28 11:07:55] |
| [问：honghui525] | 请问音频放大器的功耗是可以准确估算的吗？有什么参考设计可以提供给用户吗？谢谢 | |
| [答：Harry] | The power output of an analog audio amplifier is exactly equal to the square of the RMS output voltage divided by the load resistance. When the output voltage swing is less linear (i.e. THD is worse or higher), the RMS ouput level must be measured directly with a true RMS meter or o-scope. The datasheets for the TDA854x family of audio amplifiers have design examples to help in calculating the power output and other key parameters. | [2005-6-28 11:08:37] |
| [问：bill_xie] | 衡量RF功放的指标是哪几点？ | |
| [答：Ray] | 包括：总谐波失真加噪声(THD+N)，电源变动抑制率(PSSR)，信噪比(SNR)，输出功率POUT， 频率范围等 | [2005-6-28 11:11:38] |
| [问：kllyj2008] | D类放大器的滤波技术很关键,请介绍Philips的低通滤波技术. | |
| [答：Jef] | 有关低通滤波器技术问题我会转交相关部门，他们会和你联系，谢谢！ | [2005-6-28 11:12:49] |
| [问：kllyj2008] | Philips的D类放大器,目前的输出功率能有多高?效率有多高?它的THD+N在满功率时有多大? | |
| [答：Harry] | We are developing low power Class D amps from 1.6 to 2.7 watts. They are rated for THD at 10% and as in the Class AB amps that are currently available, they have better performance at lower output power. Class D amps have >80% efficiency; typically, 85 to 90%. Philips offers much higher Class D amps from 15 to 70 watts per channel. There is also development being done for 6 watt per channel. | [2005-6-28 11:16:09] |
| [问：wind2] | 请问有关于脉冲功率放大器的系列吗？ | |
| [答：Ray] | We are planning to develop this kind of amp now. could you give us some feedback. Thanks. | [2005-6-28 11:16:22] |
| [问：DirectCG] | Philips的模拟开关最低的工作电压能达到多低?它的信号完整性如何? | |
| [答：Jef] | 供电电压范围-0.5v--5.5v，信号完整性要看你的Layout咋样，具体参考SA630手册，谢谢！ | [2005-6-28 11:16:26] |
| [问：yjind] | 对于介绍的高频段器件,能否用在30MHz以下频段? | |
| [答：Jef] | 可以，谢谢！ | [2005-6-28 11:16:47] |
| [问：guohuabao] | Please introduce more RF products information that meet the reqirements of medical instruments. | |
| [答：Harry] | Please sent me or our sales more specific information and details regarding your application. | [2005-6-28 11:17:58] |
| [问：riello] | Philips的那些D类放大器可用在平板电视上如LCD TV? | |
| [答：Jef] | 可以，我们有成功的案例。你可以根据你的具体需求选择性价比高的器件，详细请联系jef.hou@philips.com | [2005-6-28 11:18:17] |
| [问：dlp145] | SA系列能用于DDS吗？ | |
| [答：Harry] | No, the SA5250 is a baseband part for FHSS. Check with our sales regarding DDS baseband parts. | [2005-6-28 11:20:10] |
| [问：lzf2008] | 如果要做一个隔离放大的电流电压,转换电路,贵公司有否相应的解决方案! | |
| [答：Jef] | 我们的SA5211和SA5212可以用作电流电压转换，详细请参考应用手册，谢谢！ | [2005-6-28 11:20:39] |
| [问：chunsen] | 高频如800MHz PCB的设计要注意那几方面的问题?所选用的PCB的准则有那些? | |
| [答：Ray] | PCB LAYOUT CONSIDERATIONS: - Double sided PCB,1/16 Inch G-10 OR FR4. - ONE SIDE HAS GROUND PLANE AND RADIALLY MOUNTED COMPONENTS. - OTHER SIDE HAS CIRCUIT TRACES AND SURFACE MOUNTED COMPONENTS AND ICs. - RF PERFORMANCE MANDATES SHORT INTERCONNECT TRACES AND/OR 50 OHM MICROSTRIP LINE FOR RF PATHS. - IC GROUNDS ARE RETURNED TO THE GROUND SIDE OF THE PCB VIA PLATED THROUGH HOLES OR EYELETS. PLACE DECOUPLING CAPACITORS CLOSE TO IC PINS. - NO POINT TO POINT OR “FREE FLOATING” WIRING FOR THE VCC INTERCONNECTIONS. - IN GENERAL, KEEP ALL LEAD LENGTHS AS SHORT AS POSSIBLE WITH EMPHASIS ON MINIMIZING THE HIGHEST FREQUENCY PATH LENGTHS. | [2005-6-28 11:21:23] |
| [问：fourier] | 我如何得到仿真模型(ADS软件包), 能得到样品吗? | |
| [答：Ray] | Sorry, I don"t have it. But we can provide IC samples if you want. | [2005-6-28 11:23:41] |
| [问：upfc] | 您好，我希望了解飞利浦是否有特低功耗无线通讯IC＋CPU的解决方案，因为我们正在开发一种电池供电的产品，要求CPU＋无线通讯的总体功耗小于50uA，电压3V，谢谢 | |
| [答：Harry] | No, we do not have a low current, single chip solution containing the wireless IC + CPU. More information is needed such as is this a receiver, what is the RF frequency, the supply voltage, the exact application, the transmission range. Phlips has RFID tag devices and they run at very low current but are designed for very short range. | [2005-6-28 11:28:52] |
| [问：kevinlee] | 我想请教：你们的RF模块的资料和样品，可以从哪里获得？我是郑州的公司 | |
| [答：Ray] | Pls contact our local office or desiti to obtain the document and samples. Or you can access web http://www.standardics.philips.com/ to obtain all documents. | [2005-6-28 11:29:20] |
| [问：tianjiu] | 我想选用一种单电源工作的双轨－轨运算放大器，输入为轨－轨，输出为轨－轨，输出及输出低电平与地电平相差不大于5毫伏，请推荐型号。谢谢！ | |
| [答：Jef] | 你可以参考我们的ＳＡ５２３４ | [2005-6-28 11:29:32] |
| [问：kllyj2008] | Philips的D类放大器能否不用散热器? | |
| [答：Harry] | If you mean the heat sink or an area on the PCB to remove the heat from the part, it depends on the power dissipated in the device. In other words, the answer is basically Yes! The size of the heat sink depends on many factors such as, ambient temperature, power dissipation, output power, load resistance, and so forth. Any power device needs some form of heat sinking. | [2005-6-28 11:32:51] |
| [问：sqsensor] | 贵公司是否有低成本的传感器信号调理补偿电路芯片。 | |
| [答：Jef] | 请回复邮件：jef.hou@philips.com | [2005-6-28 11:33:54] |
| [问：yuchun] | 请推荐一款cost down音频放大器，输出满足接入电视audio输入口的要求即可,最小输出电压300mv | |
| [答：Harry] | What is the typical TV audio input level to the audio amp input and what is the operating supply voltage? | [2005-6-28 11:35:24] |
| [问：zzkeng] | 双电源运放和单电源运放有多大差别？对双电源运放我能用单电源吗，会有什么问题吗？ | |
| [答：Jef] | 一般情况下不可以，具体参考产品手册，谢谢！ | [2005-6-28 11:36:09] |
| [问：meteor_chu] | 运算放大器的负载能力与哪些因素有关？如何提高运算放大器的负载能力？ | |
| [答：Jef] | 负载阻抗，供电电压有关；具体请参考产品手册！ | [2005-6-28 11:37:28] |
| [问：maeleton1] | 汽车产品的EMC性能要求较高,Philips的放大器能满足这方面的要求吗? | |
| [答：Jef] | 可以，谢谢！ | [2005-6-28 11:37:48] |
| [问：lbgy] | 手提设备对功耗有特殊的要求,Philips的音频放大器在功耗或效率上有何明显的特点? | |
| [答：Jef] | 我们最新推出ＣＳＰ封装的音频放大器，待机功耗非常小，专门应用在手机ＰＤＡ等便携产品上的 | [2005-6-28 11:45:11] |
| [问：just_soso] | 运算放大器有用于RFID的案例吗 | |
| [答：Jef] | 我们ＲＦＩＤ部门有专门的ＲＦＩＤ方案，谢谢！ | [2005-6-28 11:46:35] |
| [问：lzf2008] | 对于 SA5211/SA5212A 能否构成一个精密的电流电压转换器,我的电路的要求的精密度要求在100uV级别! | |
| [答：Jef] | 可以，详细请参考产品手册，谢谢！ | [2005-6-28 11:48:16] |
| [问：DirectCG] | 模拟频率合成器和直接数字合成器(DDS)在功能上和应用上有何区别?那种频率精度要好些? | |
| [答：Harry] | Analog versus digital synthesizers refer to the output signal. The digital synthesizers provide clock outputs that are square wave forms. The important parameter here is jitter. The analog synthesizers provide very linear sinewave outputs for VCO and low phase noise frequency sources for wireless transceiver. The frequency accuracy and phase noise are the important functional parameters. Both must have similar frequency precision. | [2005-6-28 11:48:38] |
| [问：zhxs] | 无线发射或接收的IC是否有和该公司的DSP有做到无缝连接的产品。PHLIPS有专门用于语音传输的DSP处理器吗（用于无线会议系统） | |
| [答：Jef] | 你的问题将转交给另外的部门，谢谢！ | [2005-6-28 11:48:54] |
| [问：maeleton1] | Philips有没有数字无线电产品可用在汽车电子上? | |
| [答：Ray] | Please tell us what kind of wireless product is it? | [2005-6-28 11:50:43] |
| [主持人：ChinaECNet] | 所有问题均已提交给Philips公司的专家。座谈期间未回答的问题，Philips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。 | [2005-6-28 11:50:44] |
| [问：zzkeng] | D类放大器怎样在电路板上布线？ | |
| [答：Jef] | 请参考产品手册，谢谢！ | [2005-6-28 11:51:32] |
| [问：zzkeng] | 能否介绍一下单片TDA892x D类放大器中的闭环结构如何降低THD? | |
| [答：Jef] | 你的问题将转交相关部门人员，谢谢！ | [2005-6-28 11:52:10] |
| [主持人：ChinaECNet] | 所有问题均已提交给Philips公司的专家。座谈期间未回答的问题，Philips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。 | [2005-6-28 11:53:32] |
| [问：benfu] | 降低VCO相位噪声中有什么特色？ | |
| [答：Harry] | Use passive components with high unloaded Q, and active components (VCO/transistor) with very low phase noise, and a RF frequency synthesizer (SA8027) having excellent spurious response, capture range and lock-up characteristics. | [2005-6-28 11:54:11] |
| [主持人：ChinaECNet] | 由于时间关系，本次中电网“在线座谈”马上就要结束了。虽然各位听众（网友）已与Philips公司的专家讨论了许多问题，但是还有许多提问没有来得及进行交流。本次在线座谈结束后，中电网将请Philips公司的专家继续答复所有的来自各位听众（网友）的提问，然后整理上载到中电网网站上，以便大家查阅。 | [2005-6-28 11:59:20] |
| [主持人：ChinaECNet] | 恭喜您， 大连微龙有限公司的dloco经过电脑抽奖您在本次座谈中获得一部MP3播放器。请网名为dloco的用户与中电网联系(8610-82888222-7008 或 lilin@chinaecnet.com)。 | [2005-6-28 11:59:34] |
| [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Philips公司，特别感谢专门在线回答各位听众（网友）提问的Philips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。 | [2005-6-28 11:59:46] |
| [问：meteor_chu] | 能不能谈谈锁相环锁偏或锁不住频率的原因？ | |
| [答：Jef] | 请检查你的参考时钟信号是否达到要求，谢谢！ | [2005-6-28 12:02:51] |
| [问：yannian_zhu] | SA5211的带宽能否大于200MHz?－7dBm输入OMI为10%时输出有多大？ | |
| [答：Harry] | The data sheet offers a discussion of extending dynamic range at 200MHz or greater and discusses the tradeoffs. See section 12, 13, and 14 in the datasheet. I do not understand the second question please, give me more information. | [2005-6-28 12:03:16] |
| [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。 | [2005-6-28 12:05:05] |
| [问：supernemocn] | 我们需要以下指标的运放，不知道贵公司有什么型号可以选择。 OFFSET VOLTAGE: 10uV DRIFT: ±0.1mV/°C Frequency:50MHz Supply Voltage：3.3V | |
| [答：Harry] | We do not have an op amp with these specifications. | [2005-6-28 12:05:23] |
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