ET
发帖数: 10701 | 1 可这你没解释为啥amplifier transistor contribute more non-linearity呀。
你也说了，transconductance是nonlinearity source,
amplifier的transcondutance, gm = f(vgs, vth), 即使考虑short channel effect,
vds, gm = f(vgs, vth, vds)
对于既定的biasing point, vgs, vth look quite constant for me.
即使vgs, vth变化，那对gm的影响也是线性变化 （level -1 model).
从输入到输入的gain可近似为gm1/(gm2+gmb2) ，如果考虑body effect of cascode tr
ansistor,
而vout = gain * vin 即使vin是small signal sin. 如果gain是个常数，或者线性变化
的，vout的变化也是线性的。
对gm1/(gm2+gmb2) 求导，with respect to bias. 带来影响的我只 |
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ET
发帖数: 10701 | 2 他说的make perfect sense for me.
实际上，这也是提高线性性的办法之一。
但没有解释原问题。因为原问题是问amplifier & cascode 哪个contribute more nonl
inearity.
cascode 是low noise amplifier设计中用到的最多的，source degenerate个resistor
, 恐怕也会贡献不少noise.
不过这就是另外一个话题了。
我只是很好奇这个问题的答案究竟是什么？如果我的分析不对的话。
gm1 |
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S****e
发帖数: 1063 | 3 The voltage error amplifier outputs a current command, which is compared
against a monitored current. when the monitored current exceeds the command,
switching state changes.
take a buck converter for example, upper switch is turned on at fixed time
intervals (e.g by setting a latch). After it turns on, inductor current will
raise until it exceeds the current command (given by the voltage error
amplifier), and then the upper switch will turn off (e.g by resetting a
latch). The latch will be set |
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B*****2
发帖数: 83 | 4 What is the frequency range? To my experiments, I scanned the frequency
from 1 GHz to 20 GHz. Only very few amplifiers, such as an amplifier from
Agilent (used YIG oscillations), could be used. The power is limited to 1W
in order not to heat the samples, the 线性 is not required because it is
just a source, but high stability is required. During the scanning H
field, it should be very stable, so that we could detect the absorption
and reflection. |
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g******u
发帖数: 3060 | 5 因为100个包子的许诺.所以写下这篇.因为笔者只是曾于此事的硬件设计工程师,不可
避免的是有极其片面的感想, 而且由于经验年头有限,如有任何谬误, 欢迎指出或补充,
以冀共同提高. 本文不涉及具体技术细节,有兴趣者放狗一下是很容易学到的.
版上常有ID来询问无线充电, 多数出于一篇MIT小组07年在Science上的文章,宣称在
2米距离内可以传输60W电力,在40%的效率. 这个小组在08年成立一家公司, Witricity,
专门研发家电的无线电力传输,号称,若干年后家庭不再需要插座.
其后在2010年Las Vegas国际消费电子大展上, 海尔电视推出一台不用插座的电视,
引起轰动, 也是用了MIT的技术. 于是大家很自然认为,MIT就是此行业带头人.
其实无线充电源来已久, MIT不但并非是最早, 或者最牛,甚至并非独特!世界上EE的
牛人牛公司之多,本来很难想像.Science虽然有名,可是我们这个角落里,能发 best
paper in transaction on power electronics,这种才叫牛.虽然影响因子可以忽略.
无线传电... 阅读全帖 |
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q*******n
发帖数: 52 | 6 通常用一个error amplifier,接一个Pmos和resistor divider反馈.
弱弱地问: 常用的amplifier接resistor divider反馈是不是一样?
谢谢. |
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c******k
发帖数: 1140 | 7 是否synchronous，不太确定。
setup中有个chopper， chopper的reference 输出连接到lock－in amplifier的
reference in，然后lock－in amplifier的输出就接示波器了。 |
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t****1
发帖数: 827 | 8 工业界只做产品，不做research？
我看过一篇文章，几年前发表的，关于chopper stabilized amplifier, 作者是某个知名大学的教授和他的学生，其中一个还在某知名半导体公司工作，可能是part time 学生。那个文章写的，看得我很景仰，精度比我了解到的工业界最好的还要高至少十倍。再去他们公司网上看看他们最好的chopper stabilized amplifier，精度却比文章上写的差了很多。如果他们的做法真的可以实现象那个文章中写的那么高的精度，为什么不产品化呢？
答案很简单： 为了灌水，做芯片可以不计成本，为了提高某些指标，可以牺牲其它的一些重要指标，造成市场应用的范围非常狭小，几乎没有任何商业价值，可以不管repeatability,测几十个芯片，挑几个性能最好的，把最漂亮的参数写上，也没人去深究，只要理论吹的玄乎一点，，文章就出来了。
工业界做科研，做产品，都必须考量到性价比，成品率，可靠性，顾客会测你的芯片，如果参数达不到data sheet上写的，顾客要退货的，公司名声就臭了。
集成电路的科研，不能成为产品的，没有商业价值的，在性价比上没有竞争力... 阅读全帖 |
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g****t
发帖数: 31659 | 9 我个人观点,绝大多数学术界的research比工业界浅很多.
90%学术界的通常办法:数学家做不动一个问题,就加各种假设.工科的做不动一个问题,
就在实验室创造条件减少约束.凡此种种,都是为了出文章.
然而对任何design来说,约束都是最重要的部分之一.
故意忽视重要约束的所谓"研究",在我看来,都是作假.
反过来,工业界弄虚作假的可能性不是没有,但是要小的多.
达不到data sheet所写,不仅是退货的问题,往往是很现实的赔大钱问题.
另外一个还有鲁棒性问题.很多芯片一年出货几千万上亿,如果有缺陷,那亏损+赔钱不知
道会有多少.最后,工业界产品多考虑一层约束,往往就会给产品带来质的提升,或者给客户
带来多一重方便,会让你的产品有更多的竞争力.所以工业界其实往往是欢迎约束的,新
约束说不定就是没发现的新需求.所以到最后,工业界总体方向是朝着约束往上走,以克
服各种约束为目的.
总之,对design中约束的态度,区分了工业界和学术界大部分研究.
这是我目前的一点浅见.
最后,我这个贴不是说学术界工作者就是inferior.
我讲的是对他们的"成果"的一个观察.
为什么会出现这种问题?... 阅读全帖 |
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c*******e
发帖数: 65 | 10 帮国内朋友发帖。谢谢~
Senior RF IC Designer ---- Nufront
Experienced RFIC designer contributed as a project leader of the RFIC
development group in Nufront, Beijing or Shanghai, China. The Chip design
focus is wireless radio transceiver for cellular systems. Experience in CMOS
RF& analog IC design is required. Knowledge of CMOS RF and analog IC debug
& characterization, device modeling, and design challenges in scaled CMOS
technologies as well as a strong academic and industry background is
strongly prefe... 阅读全帖 |
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a*m
发帖数: 6253 | 11 The successful candidate will be involved in research, definition, design,
simulation, layout supervision, characterization and release to production
of high-performance state of the art BiCMOS integrated circuits in the
following areas:
Power Management – LDOs, SMPS, Battery chargers, LED drivers, Charge Pumps,
Audio Amplifiers – Class D, AB, …
Interface Circuits –SPI, I2C, USB, …
Including the following functional blocks
Gain amplifiers
Bandgaps and references
Temperature sensors
Voltage monit... 阅读全帖 |
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b********d
发帖数: 720 | 12 慎重考虑一下
看看公司高层（CTO,technical VP)里有没有技术和vision大牛，如果没有，硬件的
startup还是蛮难做好的
比如如果领导们都是外行，就算他们marketing能力很强，没有好的市场和技术vision
的话，最后就变成完全被客户订单牵着走了，而且小公司收到的订单可能还不会太大，
也就是几十k或者million这种级别的吧，最后今天客户A让做solar inverter,好，那就
研发solar inverter.明天来了个客户B,要做amplifier,好，那就研发amplifier吧。然
后每次都投入很多钱开发新技术，最后也没赚到什么钱，员工一个个累得要死，手上几
个完全不相关的项目同时进行，真有精分的感觉
如果有中国客户的话，晚上12点去公司conference call,平时经常下半夜还要回中国客
户的邮件或电话
//现在也就中国有钱搞半导体，这些startup或多或少可能都要想办法找点中国大厂赚
赚钱，push得要死
engineer
10 |
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z*****z
发帖数: 2438 | 13 一个零件，所谓的中心有个孔，孔定位在一个芯轴上，4个sensor（接触、非接触都可
）测量一下距离，如图所示。这4个sensor用master校过，然后计算出零件相对master
的偏心（实际中心孔与理想中心孔的距离），不需要角度。
有没有已经成熟的模块可以实现这个功能的，比如，自带4个sensor和amplifier, 输入
控制限到amplifier, amplifer自动判断，输出1/0信号。
希望相对简单些，实在不想用4个sensor接工控再编程。
材料：铸铁
尺寸：dia 50mm
要求精度; 0.01mm
测量周期：不大于10s |
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j******e
发帖数: 50 | 14 Graduate from top 3 university in Canada, published 1st author APL papers
and will submit 1 PRL this month.
如果兄弟们的实验室有OPENING,希望通报一声。
本人有极强的 hand-on and creative skills. 以下是 technical skills.
• Lasers and ultrafast lasers
Expertise with Ti:Sapphire multipass femtosecond amplifier, Ti:Sapphire
regenerative femtosecond amplifier, mode-locked Ti:Sapphire oscillator,
diode lasers, Nd:YAG Q-switched pulse laser, diode pumped solid state (DPSS)
laser, tunable dye laser, excimer lasers, optical p |
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r*****t
发帖数: 2051 | 15 我扔掉了一台quantronix的amplifier，注意是amplifier！30万刀啊！ |
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c*******x
发帖数: 7 | 16 In Bmsplitter implementation, ports 1,2 are input, ports 3,4 are output.
1, 2 beams can be completely combined so 两束激光完全相干.
However, Bmsplitter does NOT allow to set arbitary values for Xs,and Ys.
if 1->3 amp efficiency is r, then 2-> 4 must also be r,and 2->3 = 1->4=t,
and t^2+r^2=1.
You never generate additional power.
You can NOT find a real power implementation to allow you to do (1+1)^2=4>2.
This mathmatical imagination is disconnected from real physics.
However, you can amplify your peak b... 阅读全帖 |
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d*b
发帖数: 21830 | 17 随便给你举个例子吧。
electron撞击iron plate,产生photon shower,然后你用scintillator收集photon,再进
PMT，operational amplifier, ADC counter,然后你可以根据你的counter测算电子的
能量
看简单？听说过stopping power这个词么？多少能量的electron产生多少能量的photon
shower？这个是非线性的，你得写把？然后scinitllator的response线性么？ADC
counter跟amplifier的模拟信号成正比么？
光这点活就够一个phd干一年的了，写个100页的notes不成问题吧？ |
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q*c
发帖数: 17993 | 18 一等奖：300伪币
Dblue
【Ski版2011】神马都是浮云，千万别学滑雪
二等奖：奖金每人200伪币
OnEdge 【Ski版2011】Utah 飞雪杂记 （5）：amplifier和他师傅
honny 【Ski版2011】Ski 2011 at Lake Tahoe
msuspartan 【Ski版2011】雪山飞兔 之十二：Sun Down Spirits Up
amplifier 【Ski版2011】山东快书 -嵌岩滑雪
三等奖：100伪币
bigh 【Ski版2011】飞得更高
特等奖：300伪币
qmc 【Ski版2011】地球上的天堂 - 2010/11年滑雪录像回顾
差点忘了，嘿嘿
感谢大家的参与，感谢所有喜欢滑雪的人们！ |
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w*******y
发帖数: 60932 | 20 Title says it all. This is a very good amplifier I might add. I use it with
my IPhone 4G in my car while streaming pandora .Sounds goes from my iphone
to XMOD and from my XMod to My car stereo's auxiliary jack and the sound is
incredible plus it amplifies sound a lot. I use a Cigarette lighter jack
USB adapter To provide power to the XMod .
I brought two more since they don't really go down to this price often and
I want to have back up's...
Link
Link:
http://www.amazon.com/Creative-Labs-Xmod- |
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w*******y
发帖数: 60932 | 21 Logitech Squeezebox Radio is for $125 + $7.99 shipping with the coupon code
STLISTEN
Regular price is $250
LINK:
https://www.electronics-expo.com/index.php?page=item&id=LOG930000101
&extra=a:2:{i:0;s:40:"
03823345592a403b2f4a37a59384e7ab28f02be1";i:1;s:0:"";}
* Speakers and amplifier
o inch high-definition, soft-dome tweeter and 3-inch high-power,
long-throw woofer
o Bi-amplified class D design with digital electronic crossover
... 阅读全帖 |
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w*******y
发帖数: 60932 | 22 List Price: $399.99
Price: $75.86 & eligible for free shipping with Amazon Prime
You Save: $324.13 (81%)
Link:
http://www.amazon.com/Boston-Acoustics-SNDWRESUBW-SoundWare-Subwoofer/dp/B0027KU358/
In Stock.
Ships from and sold by Amazon.com. Gift-wrap available.
Product Features
* Angular cabinet design fits into corner positions for maximum bass
reinforcemen t
* Can be configured for either forward or downward firing
* 8" Deep Channel Design (DCD) woofer for more bass ... 阅读全帖 |
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w*******y
发帖数: 60932 | 23 My first deal, so be easy on me:
TX-SR508 - 7.1-Channel 3-D Ready Home Theater Receiver $179
(-20% on refurb 11/24 - 11/29)
(-$10 for joining Club Onkyo)
F/S
No tax
=$133.20
Compare this to $250 on Amazon (new)...normally $400.
Link:
http://www.shoponkyo.com/detail.cfm?productid=TX-SR508&modelid=47&group_id=1&detail=1&ext_war=1
At Onkyo, our mission is to deliver outstanding audio and video quality to
your home, no matter what budget youre on. With the 7.1-channel TX-SR508,
you get an entry-leve... 阅读全帖 |
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w*******y
发帖数: 60932 | 24 I normally don't pre-post, but this receiver is already priced below other
sellers. At 6:20 PM EST (3:20 Pacific), Amazon will be offering an
additional discount. Most likely it will be around 50% off ($425), but could
be even lower.
Gold box link
product link
Link:
http://www.amazon.com/gp/product/B003K51IPI
Description
Onkyo HT-RC270 7.2-Channel Network A/V Receiver (Black)
by Onkyo
List Price: $849.00
Price: $499.99 & eligible for free shipping with Amazon Prime
You Save: $349.01 ... 阅读全帖 |
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w*******y
发帖数: 60932 | 27 Amazon:
http://www.amazon.com/Harman-Kardon-Performance-compatible-Upsc
Been waiting for a nice deal on this receiver for a while now.
AVR 2600 7 x 65W 7.1-Channel A/V Receiver
With features like four HDMI inputs with audio processing, Faroudja DCDi
Cinema video processing, all the latest Dolby and DTSaudio modes plus our
own Logic 7processing, adjustable A/V Sync Delay and seven amplifier
channels featuring our high-current ultrawide-bandwidth design, the AVR-2600
provides audio and video perfo... 阅读全帖 |
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w*******y
发帖数: 60932 | 28 First time posting a deal, so hopefully it's a good one.
PC Richard & Son:
http://www.pcrichard.com/catalog/product.jsp?modelNo=TXSR508
has the Onkyo TX-SR508 7.1-Channel 3-D Ready Home Theater Receiver w/ HDMI
1.4a 3D Ready Input for $199.97 with free 3-5 day ground shipping.
I went through checkout and didn't see any tax added (in OH), but this is
about $25-$30 cheaper than the front page deal from Crutchfield/6Ave last
week.
Technical Details
Onkyo's mission is to deliver outstanding audio ... 阅读全帖 |
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w*******y
发帖数: 60932 | 29 wwstereo have this Klipsch Reference Series RW-10D 10 again for lowest price
ever
$199 free shipping after coupon deals. woot
remove space before woot word
Link:
https://www.wwstereo.com/website/ecommerce/productdetail.aspx?product=RW-10d
And YES I am in for one
* frequency response: 28-120Hz +/-3dB
* amplifier power: FTC Rated Power: 260 watts continuous @ <2% THD /
Dynamic Power*: 575 watts
* maximum acoustic output: 112dB @ 30Hz 1/8 space, 1m
* drive components: 10" (25.4cm) C... 阅读全帖 |
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w*******y
发帖数: 60932 | 30 Link:
http://www.amazon.com/gp/product/B000VDZF1A/ref=ox_ya_os_produc
A brand new kit including 5 heart pounding full-length workouts and the
incredible new 3 lb. AMPLIFIER. In this kit, Billy will take you through a
core burning workout, a fat burning workout and well as jump start cardio
workout all using the exclusive amplifier. In addition, the powerful new kit
includes Billy's Weight Loss Success Guide.
List Price: $39.98
Price: $11.99 & eligible for free shipping with Amazon Prime
|
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w*******y
发帖数: 60932 | 31 Never posted a deal before but I think this is a good one:
Microcenter has the Hannspree - ST329MUB - 32" LCD TV - 1080p (FullHD) for $
199 + tax + shipping. (My total was $234).
Link:
http://www.microcenter.com/single_product_results.phtml?product
Specs:
Color Black
Panel
Display Type LCD
Screen Size 32"
Native Resolution 1920x1080
Aspect Ratio 16:9
Refresh Rate 60Hz
Response Time 6.5ms
Brightness 500 cd/m2
Dynamic Contrast Ratio 10,000:1
Viewing Angles H/V ... 阅读全帖 |
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w*******y
发帖数: 60932 | 32 Link:
http://www.musiciansfriend.com/stupid/?CJAID=10684459&CJPID=532
quote
# Frequency response: 56Hz-22kHz
# Crossover frequency: 3kHz
# Low-frequency amplifier power: 40 watts
# High-frequency amplifier power: 30 watts
# Signal-to-noise: >100dB (typical A-weighted)
# Polarity: positive signal at + input produces outward LF cone displacement
# Input impedance: 20k Ohms balanced, 10k ohms unbalanced
# Input sensitivity: 85 mV pink noise input produces 90dBA output SPL at one
meter with volume c... 阅读全帖 |
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w*******y
发帖数: 60932 | 34 Amazon Marketplace has Harman Kardon Soundsticks III:
http://www.amazon.com/Harman-Kardon-Soundsticks-III/dp/B0042F3K
fulfilled by Amazon for $116.23.
Next lowest price from a reputable seller is $135. These sell new for $169
@ most places.
Listen to a work of art.
Praised for its stunning design, the harman kardonSoundSticks II speakers
and subwoofer system became a milestone in harman kardon history when it
became part of the permanent collection at New York City's Museum of Modern
Art (MoM... 阅读全帖 |
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w*******y
发帖数: 60932 | 35 It is $165.29 - 15% shopping discovery = $140 + tax, free shipping or pick
up in store.
BIC F12:
http://www.sears.com/shc/s/p_10153_12605_05794629000P?sid=IDx20
BIC America Formula F-12 - Subwoofer - 150 Watt - black
Powered subwoofer incorporates a high current 475-watt peak amplifier
designed by BASH technology in combination with a 12" injection molded long-
throw woofer. A patented BIC "Venturi" vent eliminates port noise which is
often heard from other subwoofers, especially when playing de... 阅读全帖 |
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w*******y
发帖数: 60932 | 36 onkyo has refurb at 20% off club member prices
must be a club member...enroll on site
new members additional discount
other units available
site says good 12/10 to 12/18 appears to be working now
HT-S6300 - 7.1-Channel Home Theater Package with iPodDock
$349 less 20% free shipping may have tax = 279.20
Link:
https://www.shoponkyo.com/index.cfm
Amplifier
# Channels 7.1
Total System Power 1200W
Power (6 ohms, 1kHz, 1%)/Ch 130W/ch x 7ch
Sub Power 290W
THX Certified -
All Discrete ... 阅读全帖 |
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w*******y
发帖数: 60932 | 37 onkyo has refurb at 20% off club member prices
must be a club member...enroll on site
new members additional discount
other units available
site says good 12/10 to 12/18 appears to be working now
HT-S6300 - 7.1-Channel Home Theater Package with iPodDock
$349 less 20% free shipping may have tax = 279.20
Link:
https://www.shoponkyo.com/index.cfm
Amplifier
# Channels 7.1
Total System Power 1200W
Power (6 ohms, 1kHz, 1%)/Ch 130W/ch x 7ch
Sub Power 290W
THX Certified -
All Discrete Amplifier Circuitr... 阅读全帖 |
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w*******y
发帖数: 60932 | 38 Polk Audio Monitor Series PSW10 10-Inch Powered Subwoofer (Single, Cherry)
Product Features and Technical Details
Size: 10 Inch | Color: Cherry
Product Features
Single 10-inch subwoofer in cherry with built-in high-current amplifier for
big bass
Equipped with one 10-inch polymer-composite dynamic-balance cone driver
Laser-based Klippel measurement technology for improved linearity and deep,
precise sound
Non-resonant all-MDF enclosure construction with 0.75-inch-thick baffles and
internal bracin... 阅读全帖 |
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w*******y
发帖数: 60932 | 39 This has a FRONT AUX input & a FRONT USB input! The included Bluetooth
adapter uses the REAR AUX input. Ipod control and hands free calls with any
Bluetooth phone!!
This includes FREE Shipping, Crutchfield's lifetime support, detailed
installation instructions specific to your car, install kit including wiring
harness for your car and I even got a free pocket insert, since my 4Runner
is a double DIN.
Use this code when ordering, to get it down $20 more to $99.99, a total
savings of $50: 3A825
L... 阅读全帖 |
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w*******y
发帖数: 60932 | 41 Great reviews across amazon!
Bring the thrill of live concerts and "first run" surround sound movie
theaters into your home at a price you can easily afford. Designed to
deliver substantial bass output for home theater applications at a very
affordable price, the Velodyne VX-11 subwoofer has a 10" driver powered by a
150-watt dynamic power Class D amplifier. The front-firing 10" woofer's
output is enhanced by a precisely engineered rear-mounted port to produce
significant bass extension, output ... 阅读全帖 |
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w*******y
发帖数: 60932 | 42 SLIM SPEAKERS, SERIOUS SOUNDKEF's revolutionary T Series is in a different
league from any low profile speaker you've ever heard. As one of the world's
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发帖数: 1248 | 43 青蛙按照要求交作业,请大家指教，谢谢
SWKS
Skyworks Solutions, Inc., together with its subsidiaries, offers analog and
mixed signal semiconductors worldwide. The company provides power amplifiers
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platforms and smart phones. Its product portfolio consists of amplifiers,
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发帖数: 10521 | 48 本次统计截止时间为：2012-08-30 02:00:00 （美东时间）
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发帖数: 10521 | 50 本次统计截止时间为：2013-02-01 01:00:00 （美东时间）
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