c***r
发帖数: 1570 | 1 30W应该行，
不过我有个5W的电吉他音箱，接电箱不行，可能阻抗不匹配 |
|
j******g
发帖数: 386 | 2 买了，接上了，Yamaha silent guitar，bypass可以用，但是声音有点怪怪的，感觉还
不如耳机好听，怎么回事啊？ |
|
|
|
a*********a
发帖数: 3656 | 5 for in chip pixel binning to be better than merging RAW pixel digital
signals in post processing, the binning must happen on analog level.
That is: you add up the analog signal first, then amplify and digitize so
the analog signal is strong and the noises in amplier and digitizer circuits
are only introduced once on the summed signal.
If you merely add up the already digitized signal, then it already contains
the circuit noised from each of the pixels and it can be done equally well
with a RAW f... 阅读全帖 |
|
b*****e
发帖数: 14299 | 6 ☆─────────────────────────────────────☆
blueice (蓝色北冰洋) 于 (Wed Jul 4 16:18:51 2012, 美东) 提到:
看见朋友家取消了cable，只是用HDTV antenna收台，也能收到不少。我们看得也少，
感觉买cable服务不划算，想整个天线算了。
朋友家买的是这个：
http://www.amazon.com/Terk-Amplified-High-Definition-Antenna-Re
☆─────────────────────────────────────☆
xjack (xjack) 于 (Wed Jul 4 16:21:06 2012, 美东) 提到:
据说有地方接地就能看
☆─────────────────────────────────────☆
davychen (ilovefeeter) 于 (Wed Jul 4 16:21:45 2012, 美东) 提到:
没cable电话怎么办
☆────────────────────────────────... 阅读全帖 |
|
l*y
发帖数: 21010 | 7 www.jonsavage.com/film
Bernard Sumner
[interview, April 1994]
Bernard onstage
Bernard Albrecht Sumner
I first met Ian at a gig at the Electric Circus. It might have been the
Anarchy tour, it might have been The Clash, or one of them punk groups. Ian
was with another lad called Ian, and they both had donkey jackets, and Ian
had “HATE” written on the back of his donkey jacket. I remember liking him
. He seemed pretty nice, but we didn’t talk to him that much. I just
remembered him. Later on, about... 阅读全帖 |
|
g******i
发帖数: 581 | 8 杨振宁 国立西南联合大学-学士(1942),硕士(1944)
1957年以中华民国公民身份获得诺贝尔物理学奖，1986年获美国国家科学奖章，1993年
获本杰明.富兰克林奖章，1995年获 爱因斯坦奖章，与李政道提出弱相互作用中宇称不
守恒.与罗伯特·米尔斯一道提出了杨-米尔斯理论，即非阿贝尔规范理论，对基础物理
学产生了深远的影响，是粒子物理学的标准模型的基础
李政道 国立浙江大学物理系/国立西南联合大学-学士 芝加哥大学博士
1957年以中华民国公民身份与杨振宁以弱作用下宇称不守恒的的发现获得诺贝尔物理学奖
吴健雄 国立中央大学数学/物理学士，先后在国立浙江大学,中央研究院物理研究所工
作美国国家科学院院士 美国国家科学奖章获得者，沃尔夫奖获得者，曾任美国物理学
会会长
1957年验证杨振宁李政道的“弱相互作用下的宇称不守恒”，1963年实验证明“β 衰
变在矢量流守恒定律”
在制造原子弹的“曼哈顿计划”中解决了链式反应无法延续的重大难题
被美国物理学会宣布为最伟大的实验物理学家之一
Madam Wu is arguably the most admired female sci... 阅读全帖 |
|
S***e
发帖数: 2072 | 9 09年的前辈啊。。。
你指source? amplifier?
我很土的，iPod／iPad／laptop。。。不好意思。ipod／ipad我有加LOD; amplifier我
用fiio E9，E7。E7也能当解码器用，可以绕过计算机的声卡。E9 spec号称可以达到
600ohm，hd600没问题 。我dt880是600ohm的，觉得有点推不动。声音一直没堡出来的
感觉。
我还有个耳塞想问问值不值得。 |
|
s**t
发帖数: 17016 | 10 这次四月天诗社活动，参加人数众多，量大质优。根据最后投票结果，票数超过或者等
于十票者，可以任选一作品入选本次活动佳作选。
奖金标准：凡参加活动者，每人可得50伪币（注：按人算）。凡作品入选佳作的，每人
可再得80 伪币（注：按人算）.参加活动作品数量最多的三位作者可再获得80伪币。奖
金的发放要通过站务，请大家耐心等候。由于总伪币数目有限，分配起来比较拮据，对
不住大家了。
……………………………………………………………………………………………………
ladyred 210
cattywh 210
NWWolf 130
astonishing 130
miaoying (miao) 130
walkingtall (步步高) 130
flamencofly (flyfly) ... 阅读全帖 |
|
J*****3
发帖数: 4298 | 11 笑死我了，还来玩黑白颠倒的吗？
我给你全文吧，这么撒谎的话，是耶稣教的吗？撒谎神不喜悦
这篇文章是基督教手册用来歪曲人类进化不成立的，是JAMES给我了文章的一个LINK，但是文章看不全，我根据作者名字找到了全文，也读了，发现，文章根本没有说进化不成立，他们断章取义，黑白颠倒地撒谎。我BS这种恶心的行为。
“5、大概在97年，一个著名的非基督徒考古学家，在非洲发现的所谓人类化石，把一
直以来公认的人类进化顺序，猿人——直立人——能人——智人，给彻底推翻了。目前
人类进化链条重新归零，变为空白。”
原文
http://news.nationalgeographic.com/news/2010/05/100506-science-
翻译：
“Even if the new result doesn't quite settle the debate about whether
Neandertals mixed with modern humans, it does underscore how different they
were from our own lineage. And t... 阅读全帖 |
|
I*********y
发帖数: 185 | 12 Oh, regarding that the output power of an EDFA can never exceed a certain
Pmax. Why is that? I checked the commercial specs of many non-AGC EDFA products,
they do have a parameter called "output saturated power", but its definition is
the output power when the amplifier gain drops to a half of the small signal
gain.It by no means implies that it's the upper bound of the amplifier output
power, according to my understanding.
As a matter of fact, Pout increases when Pin increases, even though gain |
|
o*****s
发帖数: 1445 | 13 以下是引用Caffeine在2009-9-13 11:35:00的发言：
昨天花了一下午比较不同的组合，回来写个总结吧。
首先，我对innovative audio video的服务是非常的满意。sales gg自己是音乐家，给
我讲了好多。本来我想一个小时出来，结果搞了4个半小时的试听+讨论。
试听的CD我带了3个。一个是原版the joshua tree, sampled "street with no name".
POP, sampled "Discotheque". Amy Winehouse, Frank, sampled "In My Bed".
首先实验了Rotel amp+B&W 685 vs B&W CM1
CM1明显是太人工了。声音很平面，空间感基本没有。虽然是贵了很多的型号，效果真
是不让人满意。后来听了amy winehouse,高音简直是相比之下非常之讨厌。听了两句我
就把CM1排除了。sales后来搬来了CM5,低音比685显然阐释的好很多。相比之下685的低
音很浑浊，就像煮久了的面条汤，都混到一起去了。所以我现在基本决定living room
要一对C... 阅读全帖 |
|
o*****s
发帖数: 1445 | 14 以下是引用Caffeine在2009-9-13 11:35:00的发言：
昨天花了一下午比较不同的组合，回来写个总结吧。
首先，我对innovative audio video的服务是非常的满意。sales gg自己是音乐家，给
我讲了好多。本来我想一个小时出来，结果搞了4个半小时的试听+讨论。
试听的CD我带了3个。一个是原版the joshua tree, sampled "street with no name".
POP, sampled "Discotheque". Amy Winehouse, Frank, sampled "In My Bed".
首先实验了Rotel amp+B&W 685 vs B&W CM1
CM1明显是太人工了。声音很平面，空间感基本没有。虽然是贵了很多的型号，效果真
是不让人满意。后来听了amy winehouse,高音简直是相比之下非常之讨厌。听了两句我
就把CM1排除了。sales后来搬来了CM5,低音比685显然阐释的好很多。相比之下685的低
音很浑浊，就像煮久了的面条汤，都混到一起去了。所以我现在基本决定living room
要一对C... 阅读全帖 |
|
|
|
c**i
发帖数: 6973 | 17 (1) First off, I am a biologist by training. I did take physics 101 in
college, but never took quantum physics, to my eternal regret.
(2) When I prepared the original posting, I read this though I did not cite
it (but this report is the basis of my statement regrading Intel
announcement--"yesterday").
Brooke Crothers, A peek into the future of Intel processors. CNET, Oct. 19,
2010.
http://news.cnet.com/8301-13924_3-20020078-64.html
(15 nm in the lab)
(3) About your question, first let's hear wha... 阅读全帖 |
|
|
m*******n
发帖数: 307 | 19 音箱因为一般功率比较大，通常的电脑音频口是没法驱动的，需要功率放大器（俗称功
放，英文Amplifier）,所谓有源音箱就是自带功放，无源就是需要外接独立功放，真正
稍微好点的音响设备都是采用独立功放的。
所以你需要一个功放，最便宜的解决方案：Pyle Home PCA1 Mini 2 x 15-Watt Stereo
Power Amplifier ，Amazon上价格： $26.69 |
|
c****l
发帖数: 1086 | 20 问题同样在这里，就像正常组织一样，存在Stem cell (slow cycling)--> transit
amplifying cells (fast cycling progenitors) --> differentiated cells (non-
cycling) 这样hierarchy， 肿瘤组织中同样存在， 化疗药杀死的都是transit
amplifying cells 而不是stem cells。在这种情况下cancer stem cell的理论就具有
一定的意义了。 |
|
Z**********g
发帖数: 222 | 21 1. 关于cell (slow cycling)--> transit : amplifying : cells--> differentiated
cell,在正常组织中研究比较深入的比如intestinal stem cells,文献参阅:
Nature. 2010 Oct 28;467(7319):1055-6.
在肿瘤组织中,证据确实比较少,但也有,参见
Cell. 2009 Sep 18;138(6):1083-95.
2. 看了你的所有帖子,感觉你的观点其实就是clonal evolution.但是我觉得你把
clonal selection和CSC绝对对立了.在肿瘤起始阶段,clonal evolution当然是起作用
的,足够的一系列突变导致某个细胞被彻底恶性转化,这个被转化的肿瘤起始细胞可以认
为是肿瘤的始祖,可能是CSC,也可能不是.如果该起始细胞是CSC,那么它就会发生self-
renewal和differentiation;在CSC self-renewal中,如果对称分裂,那么CSC就开始
expansion了,而非对称分裂,那么就会产生progenitor... 阅读全帖 |
|
W*******a
发帖数: 1769 | 22 You need to understand how Illumina seq works. Two ends of the
library molecule anneal to two oligos on the slide, forming
a bridge, and a PCR is performed in situ to amplify this molecule
into a cluster. The efficiency and consistence of cluster forming
is limited by the size of the insert, you can't have very long
product (>1kb)
classical pair-ends are generated directly from short inserts
usually less than 1kb, so no special library preparation method is
required.
For mate-paired, the t... 阅读全帖 |
|
m******5
发帖数: 1383 | 23 借这个帖子再请教您一个问题
在stable transfection linealize的plasmid的时候，您个人认为有必要PCR amplify
full length integrated plasmid么？还是挑特征序列amplify一下一般就足够了？ |
|
K******S
发帖数: 10109 | 24 you can amplify DNA/RNA but not proteins. That's the key issue. If someone
can come up with a way to amplify proteins, s/he will be very rich.
High throughput: you can do thousands of MALDI-TOF in one day.
sensitivity: MRM constantly detect compounds with low atto-molar
concentration.
Quantitation: a handful of ways to do that. But you've gotta respect the
chemistry. For DNA/RNA, you only have a few different n.a. while for
proteins, you have 20 a.a.
Personally, I don't think high-throughput is ... 阅读全帖 |
|
s*****v
发帖数: 274 | 25 Agree.
It is not that easy as some people thought to amplify a promoter sequence by
PCR, especially with a low quality template. Lots of high GC repeats and
complex higher order structure. You might even get trouble to sequence it
after you amplify the sequence. |
|
b****r
发帖数: 17995 | 26 我主要关心的其实就是能不能躲开SNP，最好也能躲开homopolymer，repeats，这些都
是对Sanger结果很致命的。在一两个标本上的一两次测试不能解决这个问题啊
If there happens to be a SNP located at the 3’ end of the primer, the
primer will very likely to fail to amplify. For my purpose that is pretty
much lethal, as if I am trying to see if a heterozygous mutation is in a
patient’s DNA, but your primer happen to locate in one of the patient’s
SNP and mismatch, the PCR will probably only amplify the wildtype allele,
not the mutant allele. And SNPs are so common in t... 阅读全帖 |
|
c*********r
发帖数: 1312 | 27 我觉得算一点，但不是最重要的。
核算可以amplify，但是如果蛋白可以给你足够量的样本，也不需要amplify。
我觉得MS还是有些问题不能很好的解决。比如DNA/RNA fragmentation可以通过机械作
用/离子等作用等来尽可能的“随机”打断DNA/RNA来保证coverage的均一性。但是MS就
必须用酶来在特定位点来消化。
而且现在很多DNA/RNA测序为了解决扩增带来的bias，好多测序方法都是amplification
-free的。
不过我又仔细想了一下你这个amplification还可以理解为测序过程中的互补配对边合
成边测序，这样的话这个amplification是决定性的，在illumina、PacBio等测序方法
中。
但是oxford nanopore, ion torrent在测序过程不需要利用这个互补配对合成的过程，
当然后者的library prep中可能还是要用到。所以oxford Nanopore是完全和
amplification无关的。
所以关键还是ATCG四种信号相对简单易测，加上各种修饰也还好。蛋白几十种氨基酸加
上各种修饰就太复杂了... 阅读全帖 |
|
s*****g
发帖数: 352 | 28
Your speaker amplifiers are acting as a simple radio receiver. It
actually takes broadcast signals and demodulates it and amplifies
it. Next time this happens, try turn on a radio, (try AM first,
as it's the most likely source), and you will probably find the
station playing the same tune as your "sleeping" speakers. :-)
Please let us know the result of your investigation, as I am
interested in knowing whether my guess is right. Thanks! |
|
r**********d
发帖数: 212 | 29 X. -H. Jia,
" Theoretical investigation of gain-clamped semiconductor optical amplifiers
using the amplified spontaneous emission compensating effect,"
J. Opt. Soc. Am. B 23, 2503-2510 (2006)
请用此链接下载：
http://josab.osa.org/abstract.cfm?id=119224
E-mail：r**********[email protected]
万分感谢！！ |
|
d*b
发帖数: 130 | 30 Epicom New Hires Job Descriptions:
1. RF EE Design Engineer:
(1) RF Front End MMIC design experience: Handset Power Amplifier, WiFi/WiMax
Power Amplifer, Low Noise Amplifier, Switch, filter design, Frequency ~
1GHz-10GHz
(2) PCB design experience: PCB design to test PA, LNA, Switch, filter, etc.
(3) Familiar with MMIC design tools, such as Agilent ADS, AWR MWO or AO,
HFSS, SONET, AutoCad, Cadence, etc.
(4) Familiar with Device (HBT, PHEMT, Diode, etc.) and Device Modeling tool,
such as Agilent I |
|
f*****0
发帖数: 489 | 31 "如果现在很多工艺的电流驱动能力都够的话 这样做有什么好处和弊端呢 "
the most common case is that to avoid loading up the (closed loop) amplifier
especially when a non-resistive load is used.
majority of feedback designs don't work well with very low impedance load. A
good example is the tone control or equalization circuitry in an audio
amplifier. By using a buffer, you are preventing a tough load from impacting
the feedback loop, or to alter its behavior (for example you don't want the
frequency response of a circuit to shift |
|
e***b
发帖数: 53 | 32 IC design? all aspects analog and digital circuits are involved, such as
data converter, codec, DSP, video amplifier, audio amplifier, active filter,
etc. I doubt there is a single chip solution.I guess you need multiple
chips and put them on PCB. |
|
w********e
发帖数: 385 | 33 oscillation? there was a joke that if you want to design an amplifier, try t
o design an oscillator, it will turn out to be an amplifier, vice versa. |
|
m*********8
发帖数: 6 | 34 要写一个travelling wave amplifier的报告，感觉网上没有多少资料。想熟悉一下twa
的理论和现状以及发展，另外，TWA和distributed amplifier有什么关系。请各位大虾
帮忙。 |
|
H***F
发帖数: 2501 | 35 一个东西
要写一个travelling wave amplifier的报告，感觉网上没有多少资料。想熟悉一下twa
的理论和现状以及发展，另外，TWA和distributed amplifier有什么关系。请各位大虾
帮忙。 |
|
f*****0
发帖数: 489 | 36 "That is non-sense! For many OpAmps and Instumentation Amplifiers, one
important specification is noise between 0.1Hz to 10Hz, or 0.01Hz to 10Hz.
That is measured by passing the amplifier output through a bandpass filter
with passband of 0.1Hz to 10Hz or 0.01Hz to 10Hz. Yes, we do use an analog
filters to do that. it works fine at this low frequency. go to take a look
at some datasheets: http://focus.ti.com/lit/ds/symlink/opa2244.pdf"
sorry for being persistent but where did the opa2244 datashee |
|
b********0
发帖数: 80 | 37 这不是好不好的问题，是能不能的问题。
有能drive both capacitive and resistive load的运放，但是成本高，设计复杂。如
果只是需要drive capacitive load的话，很多简单的opamp就可以了。可大部分简单的
opamp却不能drive resistive load，原因前面已经有人基本解释了。Maily gain and
output current issues.
OTA 根opamp 从严格的定义来说，是有区别的，就像前面有人指出的。但是在IC
design 领域，区别根本不严格，常常互用。opamp, amplifier, OTA may mean same
thing.
As for the stability when drive capacitive load, it really depends on the
location of dominate pole of amplifier. If it is at output, more capacitance
makes it more stable. If it is |
|
l*******c
发帖数: 523 | 38 photodetector是电流输出，后续电路一般要加amplifier，加怎样的amplifier，如
linear op-amp 还是log-amp, 往往取决于你需要的BW。
如果对电流大小的精度要求很高，还需考虑inject current 和 dark current. |
|
i****g
发帖数: 19 | 39 很有意思.
不过我是模拟设电路计师,不是EDA界的人,也不喜欢写程序.其实EDA很有商业前途的,尤
其适合咱们中国哥们干.不信你到硅谷EDA公司看看.
对了,如果你仅是一个设计师(也许不大好),你想保住工作.如果你是一个好的设计师,工
作会找你(也许不是现在).下一个境界应该是创造工作了.话扯远啦.
其实模拟电路,在下以为:Bandgap, PLL, ADC/DAC, that is all.不包括RF部分.
其基本部分就是amplifier, 其实你只要会做Folded-cascode OTA, gain-boosting
Folded-cascode OTA, class-AB amplifier (including rail-to-rail),pipeline ADC
, delta-sigma ADC, self-biased PLL, fractional-N PLL, 你就是大拿(只少我认为).
其实pipeline ADC 的关键也是OTA.
你能否开发程序, 能够Integtate到 Cadence tool 里(用SKILL),我只要画好电路,程序
能够根据要求定出 |
|
j******e
发帖数: 50 | 40 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 hands-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 |
|
n***r
发帖数: 25 | 41 Let me go over with you again.
;the gain of the amp is 500k/10=50k x, approaching most opamp's open loop
;gain, if not more.
Let's replace the 10 ohm with 0 ohm. Will your inverting amplifier theory
work? will the transimpedance amplifier work? Admit it, you were misled by
the 10ohm resistor then you came up with a wrong AC bandwith analysis.
;at that king of gain, the bandwidth of the opamp is very low, likely <10hz -
;check out the opamp's datasheet.
Wrong! The bandwidth of the Transimpedance |
|
ET
发帖数: 10701 | 42 假设他们都没有。我专用的。用来power class-D audio amplifier. 我的amplifier用
90nm technology,1.8V 供电，要大电流； dsp部分65nm， 1.2v供电，小电流；所用电
池还是3.3v。
我该咋设计呢？ |
|
