w*********n
发帖数: 2 | 1 1. Draw the connection with 3 single-ended inverters in series. Can you do
with 2 inverters? Why? Draw the differential version.
-2 single ended inverters cannot oscillate, differential version can, take 2
-stage differential as 4-stage single ended;
2. How to size PMOS transistor sizes relative to NMOS to get the symmetric
rising/falling edges? Why we want to do this?
-Symmetric rising/falling edge can achieve better flicker noise, refer to
Hajimiri noise model;
3. Now if we increase all the tr... 阅读全帖 |
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x***g
发帖数: 454 | 2 1. Draw the connection with 3 single-ended inverters in series. Can you do
with 2 inverters? Why? Draw the differential version.
2. How to size PMOS transistor sizes relative to NMOS to get the symmetric
rising/falling edges? Why we want to do this?
3. Now if we increase all the transistors’ sizes by 10X, what will be the
new oscillation freq ?
4. Typical ring oscillator duty cycle variation range across PVT?
Which one of the PVT variations affects the most? Methods to adjust
the duty cycle clos... 阅读全帖 |
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s******u
发帖数: 142 | 3 wait for the solutions. BTW, for Q3, increase the sizes by 10X, you mean
aspect ratio W/L increased by 10x, or both W x10, and L x 10? |
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y*****e
发帖数: 40 | 4 等LZ来贴答案。。1懂半个，2、3貌似懂，4完全不懂。。。菜鸟飘过。。。 |
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x***g
发帖数: 454 | 5 喔, 既然有人有兴趣, 那我就先扔个三瓜两枣. 很显然, 有些问题不是三言两语
讲得清的, 有些问题是OPEN的.
首先申明, 这些是实战题, 可不是我拍脑瓜现摆弄. 但妙在它们出自一个DIGITAL GUY
之口, 就让我觉得有点小意思了.
used,
Note 2 single-ended inverters in series will be a latch.
One hint: duty cycle.
The answer is correct if neglecting wire parasitic cap. And the
assumption here is of course, Lmin stays the same and W is increased
by 10X to get 10X stronger. But the best way to understand is to
think about the freq dependence on the RC product.
This is a very open question and can go as ... 阅读全帖 |
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v********a
发帖数: 155 | 6 调查下关心这些问题的都是什么背景的呢
电路设计还是半导体工艺？
我是搞半导体工艺方面的，RO本来不是很懂，但是现在接触的很多，
RO在工艺中是一个 process monitor,不知道在实际电路中啥作用呢 |
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v********a
发帖数: 155 | 7 貌似2楼和我差不多，1,4不懂，2,3还行，
2， tpd=Ceff*Vdd*(1/Ieff,n*Wn/Ln +1/Ieff,p*Wp/Lp )
想symmetric 的话就需要后两项相等,而Ieff=Ieff(Vth,Cox,u)等诸多因素的影响，不
单单是mobility，综合的效果就是Wp大概是Lp的1.5倍左右。
3， 如上，如果W, L同时增大10倍的话，主要的变化来自Vth，一般来说Vth对于W的变
化不大（当然也看具体工艺），而NCE引起的Vth roll over不是一个简单的单调函数，
pfet 和 nfet 也是不一样的，工艺不同，器件不同，变化也是不同，所以只能说，f怎
么变不可知。
大家认为呢 |
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w*********n
发帖数: 2 | 8 1. Draw the connection with 3 single-ended inverters in series. Can you do
with 2 inverters? Why? Draw the differential version.
-2 single ended inverters cannot oscillate, differential version can, take 2
-stage differential as 4-stage single ended;
2. How to size PMOS transistor sizes relative to NMOS to get the symmetric
rising/falling edges? Why we want to do this?
-Symmetric rising/falling edge can achieve better flicker noise, refer to
Hajimiri noise model;
3. Now if we increase all the tr... 阅读全帖 |
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y*****e
发帖数: 40 | 9 大家分歧好大的样子，单就第3个，也貌似是最简单的一个来讲，答案是不是，只增加W
,f几乎不变； 如果W 和L都增加，我怎么算着是100倍的降低呢，哪里错了？
我的思路：
时间常数t=RC, R 与W/L成反比，C于W*L成正比，那RC应该是与L^2成正比喽？ |
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j******e
发帖数: 526 | 10 1 中的differential应该指的是用差分放大器
4 确定只有10%? 我印象中经常有30%，可以加个D触发器也能产生50%
1.
and |
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j******e
发帖数: 526 | 11 基本都是基础吧，razavi的那章基本都囊括了 |
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t*******n
发帖数: 408 | 14 Crystal Osc should be better than any other internal clock sources. |
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b****e
发帖数: 227 | 15 First:
You have to read the website for that residency program and you can get it
either
From Freida http://www.ama-assn.org/vapp/freida/srch/
Or from your AAMC web page.
Then what you have to look for!!! the current residents (any IMG) and where
did they went after residency (some do not write this in their websites) and
if they have fellowships read the names of the current fellows in the filed
you are interested in..
That can give an idea how friendly they are to the IMG.
Also read about the ... 阅读全帖 |
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y**j
发帖数: 10 | 16 Just checked NBME website and got the good news. Took it on Dec 10 at
Atlanta and felt Ok after the exam. It is similar to OSCE but easier. I
studied for 2 weeks in between of interviews. Only book used: First Aid.
Read it through twice and practiced by myself for about 10 cases. The most
important stuff to remember is to be confident. No patients will trust you
if you have no confidence in yourself. Be calm and confident and you will
pass. Best luck to all of you. |
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发帖数: 1 | 17 请问interview会问那类问题？是像找工作面试那样，还是像OSCE考试那样考临床知识
、病例分析？还是都有？
thanks |
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h**********0
发帖数: 57 | 18 本人在加拿大，硕士，想考药剂师，06年国内药学本科，目前犹豫中，是申请个2年的
护士（第2学位那种）出来时RN还是坚持备考药剂师？加拿大的考试好像没有很多人试
过啊，听说最后OSCE的部分很难。但是不试试又怕以后后悔。但是很可能折腾2年最后
也没考过。要是现在读个护士2年后也毕业了。矛盾中。。。求建议，谢谢各位。 |
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c****m
发帖数: 626 | 19 药学院英语交流能力还蛮重要的，
要和其他医疗人员交流，和病人交流。
我一般和同学一起联系OSCE考试，这样如果英语表达得不清楚同学可以给我指出来。 |
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M***e
发帖数: 40 | 20 能科普一下这边的OSCE是什么吗？ 最后的board exam （就是拿license 的考试）需要
考这个吗？
谢谢了先 |
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j******e
发帖数: 50 | 21 好像之前有发给我们哦。我去找找。
我们现在还在capstone呢。。。。今天osce做的我太丢脸了。。。 |
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a**y
发帖数: 6501 | 23 【 以下文字转载自 Fashion 讨论区 】
发信人: aquarius923 (aquarius0205), 信区: Fashion
标 题: 美国全攻略，在美国两年的心血
发信站: BBS 未名空间站 (Sun Oct 9 23:03:53 2011, 美东)
所有分类还是根据我收藏夹的分类来：
American traveling：
Air Tickets：
国际：
美中中美机票打折特价价格查询预定参考 http://www.travelsuperlink.com/backchina/
必要的时候可以根据机票代理list逐个询问机票，不过速度有点慢，时间紧迫的话最好
直接电话联系，我曾经试过同时跟20个客服聊到凌晨。为了省钱，大家要有耐心呢。
iFlyChina.net 飞网中国 http://www.iflychina.net/
美中中美机票价格信息发布 寻找同行 机票代理 最新美国签证预约时间发布
Powered By People，同样可以根据travelsuperlink的方法找客服查询机票。这个网站
最强大的功能是可以让客服主动联系你。首先注册一个账号，... 阅读全帖 |
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w*******y
发帖数: 60932 | 25 Link:
http://www.cigarsinternational.com/prodDisp.asp?item=sp-ca19
Saw this offer in the Car and Driver magazine. It looks to be a good deal
for someone starting to get into Cigars. I can not comment on the quality of
the cigars but I know there are a lot of experts here.
Introductory offer for new customers!
If you like handmade cigars, you're gonna love Cigars International! To
prove it, I've compiled a sampler with 10 of the finest cigars in the world
plus a FREE glasstop humidor for one supe... 阅读全帖 |
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w*******y
发帖数: 60932 | 26 Back in stock:
Top-Shelf Glass Top Humi Sampler
Sampler includes 1 each of:
- Cohiba Red Dot Robusto (5x49)
- Hoyo Excalibur Epicure (5.2x50)
- La Gloria Cubana Serie R #5 (5.5x54)
- Macanudo Hyde Park (5.5x49)
- Partagas Padre (6x50)
- Punch Pita (6.1x50)
- Cu-Avana Intenso Gordo (4.5x54)
- LHC Osc. Fuerte Robusto (5.5x54)
- Cuba Libre Magnum (5.5x55)
- La Estrella Cub. 'R' (5x50)
- Whitetail Glasstop Humidor (50 Capacity)
Click here:
http://cigarsintl.com/sav209
|
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w*******y
发帖数: 60932 | 27 I know there was a similar sampler already posted but this sampler in my
opinion has better Cigars.
Sampler#2
Introductory offer for new customers!
If you like handmade cigars, you're gonna love Cigars International! To
prove it, I've compiled a sampler with 10 of the finest cigars in the world
plus a FREE glasstop humidor for one super-low introductory price: instead
of the normal retail of $146.70, my offer to you is just $29.99!* I'm
betting once you receive these outstanding cigars, togethe... 阅读全帖 |
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