u*******m
发帖数: 3395 | 1 形状是（bode plot）直线下坡然后在某个点转弯成直线上坡。
20dB/decade slope.
原因是最简模型是电容和小电感的串联，电感来自于导线。小电感上有
小电阻串联但电阻作用可忽略。阻抗的转弯点是电感和电容的阻抗抵消
频率。 |
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b*********r
发帖数: 651 | 2 闭环gbw 越高，反应越快
开环 gain 衰减的越快，bw越低，高频noise被滤掉的越多。 |
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s*****M
发帖数: 30 | 3 So,
1. for open loop, lower bandwidth= good noise rejection
2. for close loop, higher bandwidth = good noise rejection
am I right? |
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b*********r
发帖数: 651 | 4 说实在的，我记得反馈好像对noise没什么帮助，又或者是对反馈网络上产生的noise，
没什么效果，也许是我错了，你再去看看razavi。
。。 |
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c****s
发帖数: 2487 | 5 波特图不是以开环响应判断闭环稳定性吗？
理想系统input referred noise的闭环transfer function跟带宽没关系
LPF把有用频带的噪音滤掉的话那信号也剩不下，这不就废了吗
noise
off |
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a*****1
发帖数: 80 | 6 2. RC low pass filter，bandwidth越小就相当于cut-off
frequency越小 为的是滤掉更多高频
1. close loop的反馈调节（例如负反馈）是通过降低低频处的增益来得到高Bandwidth
的。开环G越大，Bandwidth越大。但是cutoff frequency没变
所以两句不矛盾啊，可以查查Thomas Lee的CMOS RF IC design有一部分讲过这个问题 |
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d********g
发帖数: 11948 | 7 我觉得你可以看看noise bandwidth的定义
noise
off |
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i*****t
发帖数: 24265 | 8 二者不矛盾
noise作用于输入，rejection没用，滤波有用
noize作用于中间，那么rejuection哟用，滤波没用
noise
off |
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s***d
发帖数: 15421 | 9 you shold figure out:
1. loop gain zero dB frequency.
this is defining the settling time of the feedback system. Higher zero dB
freq, the faster feedback is. Has nothing to do with input refereed noise. I
think the input refereed noise only or 70% depend on the gain. the high
gain, the less input refereed noise.
i think the noise rejuection you mean is power supply rejection. that is
something to do with feedback. The feedback system such as regulated current
source/mirror is using a opamp simil... 阅读全帖 |
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f****i
发帖数: 20252 | 10 请先定义系统，信号输入输出端口，噪声输入输出端口
noise
off |
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z*****h
发帖数: 547 | 11 系统反应越快说明对noise的rejection越差啊，你想想阿猫阿狗的noise都能让系统反
应怎么会更好呢
noise
off |
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t**********m
发帖数: 205 | 12 You are right.
Those HEPs stick to Einstein and can not explain anything about the universe
, e.g., Bode's law, galaxy patterns, the origin of human, why is there no
superman? Why is human brain rational?
Those HEPs are similar to wallstreet Madof. |
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m**a
发帖数: 75 | 13 发信人: mirrorlake (我是白痴), 信区: Science
标 题: 金玉良言 — You and Your Research ΙΙ
发信站: 生命玄机 BBS (Sun Jul 2 15:16:58 2006)，WWW信件
今天整理一下,发现自己居然少上传一部分。
金玉良言 — You and Your Research ΙΙ（ZZ）
（接上篇）
现在来谈谈驱动力的问题。你观察到大多数伟大的科学家都有惊人的动力。我和John Tuk
ey (1973年获得美国国家科学奖。在数学和统计学理论方面进行了深入的研究，并为统计
学在物理学、社会科学和工程学方面的应用做出了突出贡献。译者注) 一起工作了10年，
他一直动力十足。大约我加入三、四年后的一天，我突然发现John Tukey比我还稍年轻一
些。John是个天才，我显然不是。我于是冲进Bode的办公室，对他说：“像我这“把”年
纪的人如何能和John Tukey了解得一样多？” 他向后靠在椅子上，把手放到脑后，咧嘴
笑
道：“如果你知道这些年像他一样努力的话你就能了解多少，你会大吃一惊的。” 我无
地
自容般地逃出了他 |
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l*********s
发帖数: 5409 | 14 it is normal for mid,small companies; and, it can only bode well :-) |
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G*********8
发帖数: 644 | 16 Big Week Ahead for Euro Zone
By EMESE BARTHA
FRANKFURT—The eurozone debt market faces another big test next week as
fiscally-weak governments prepare a deluge of new bond issues even as
worries about default risk increase. Market watchers expect the yields
demanded by investors to rise sharply from previous offers as a premium.
"In our view, next week's market attention will be mainly focused on EMU [
euro-zone] peripherals' supply as the market has already shown renewed
interest for highly-rate... 阅读全帖 |
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g********n
发帖数: 2314 | 17 Mortgage applications at 7-month low
Industry group says requests for home loans fell 18.9% last week as
borrowing costs increase.
NEW YORK (Reuters) -- Mortgage applications plunged to a seven-month low
last week as demand for home refinancing loans tumbled 30%, data from an
industry group showed Wednesday.
The drop does not bode well for the hard-hit U.S. housing market, which has
been showing some signs of stabilization, with sales rising and home price
declines moderating in many regions of ... 阅读全帖 |
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g********n
发帖数: 2314 | 18 Real estate billionaire Mort Zuckerman describes the state of the housing
market:
America’s housing crisis has not gone away. If anything, it is getting more
severe. Today, median single family house prices nationwide are down by
slightly more than 30 per cent from their early 2006 peak. Fusion IQ, the
research group, estimates that excess inventories will push prices down by a
further 10 per cent. This is a critical issue because home equity was for
years the largest asset on the balance sheet ... 阅读全帖 |
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A**l
发帖数: 225 | 19 Triangle consolidation after a long down leg. Does not bode well.
And mkt was really weak on Friday.
Let's see how it goes next week.
Hope for the best & prepare for the worst. ^_^ |
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w******n
发帖数: 8158 | 21 十大那个妞好靓啊，跟gg们推荐，传说中的小辣椒 |
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p****s
发帖数: 32405 | 27 wut? did I miss anything?
link plz |
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p****s
发帖数: 32405 | 30 十大热门话题
祝大家新年快乐! 发包子了
公告：成人俱乐部 春节抽奖通知！一等
今天也被黑人抢了
过新年，祝大家心想事成，奔一个
爱因斯坦对中国科学的评价
今天我在sams club 钓到一个小黑妹
对女同事有好感，被老婆认定了我是精神
春晚变着方恶心留学生好几年了 (转载)
为谁独行天地，南加大龄女征友
上哪儿买很长的网线啊？
which one? |
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p****s
发帖数: 32405 | 35 like 今天上午你有理有节地举的那个美国滑雪mm, 那个就是实打实hot美女 |
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G******f
发帖数: 16223 | 43 转链接应该还好把。我觉得请勿转帖转载就是意思是不要在其他地方留底，这样lz删了
就没了 |
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A********o
发帖数: 13968 | 50 赞奶 快给哥个链接啊
不过这个小辣椒不是老早就本国你
你们没见过 |
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