学习仿真--马兰士hdam-sa模块探究

millwood

"这段有错,运放Pin2==负,Pin3==正,Pin6输出"

I know the confusion.

t2/t3 together with the low side pnp output transistor draws current during the negative output cycle on pin 6, and t1 with the upper npn output transistor pushes out current dyring the positive output cycle.

the pin assignments, as you outlined, are correct.

millwood

激光鼠 , I have a hard copy of the book.

it is available from amazon.com, and quite pricy ($60). a classic and must have if you ask me.

激光鼠

原帖由 millwood 于 2007-11-22 22:25 发表
激光鼠 , I have a hard copy of the book.

it is available from amazon.com, and quite pricy ($60). a classic and must have if you ask me.

能不能扫描成PDF啊

小鬼头

hi,millwood.以前我在Walter Jung的个人网页见到他写的运放系列文章.

不知道是不是你说的那本书的内容呢?

激光鼠

那个网站现在是不是打不开的？

小鬼头

原帖由 Biglee_163 于 2007-11-21 00:08 发表
如果R17==0,就会产生震荡

你能发现这个.不错.

上次装制了两次这种输入缓冲级.

第一次,是没有振荡.

第二次,电路有所改动,主体不变.发现有振荡.后几经试验.还是加上这只基极电阻(老外叫base stop电阻)消振最有效.我加的是数百至1K.

仿真真是.....不可全信,也不可不信............

小鬼头

原帖由 激光鼠 于 2007-11-22 22:52 发表
那个网站现在是不是打不开的？

好象是.

Biglee_163

因为没有具体的零件数值,我都是按照框架自己估算后一次一次实验的,所以发现了有震荡.但这震荡很象驱动容性负载的感觉

激光鼠

找国外朋友试了，他那里能打开waltjung.org网站，气啊

Biglee_163

网路369的杰作

locky_z

Ti的有个文档名字SLOD006B.pdf才是"op amp for everyone",这本在Ti上有下载，464Pages
AD出的那本Op Amp Applications handbook"可能才是你们说的那本吧，895Pages

其实两者差不多，但AD的书的例子都是用AD公司的运放来举例。个人觉得Ti好一点

激光鼠

大致翻了一下Ti 的OP AMP for Everyone，教科书式的内容，给初学者看的，只有最后关于布线的知识还马马虎虎。

millwood

I have downloaded the book from Jung's website. please let me know how I can get it to you all. it is 16.7mb compressed.

the link is apparently from analog.com but I am not good enough to post it here.

this is the link to jung's site: http://waltjung.org/ADI_Books.html

enjoy.

激光鼠

加我MSN: jim_zhu@21cn.com
waltjung.org的IP被封了，大陆人无法访问的

locky_z

刚才再仔细去看了一下Walter Jung那本书，的确比Ti的深入，讲解内部电路较多较好

原帖由 millwood 于 2007-11-22 20:11 发表
however, it doesn't have the traditional VAS (voltage amplification stage) of a VFB. Instead, it uses T1 and T2/T3 to for a current transmission line and the constant current source to current drive the output buffer

这本书的115页（98页）上说Q3仍然是VFB电路呀

millwood

I am sending it to you now, 激光鼠.

please let me know when you get it.

激光鼠

原帖由 millwood 于 2007-11-23 00:01 发表
I am sending it to you now, 激光鼠.

please let me know when you get it.

我在AD网站上找到了，谢谢你

millwood

locky_z:

I am not sure about that assertion.

t1 / npn work on the positive cycle without t3.

the purpose of t3 is to turn the current from t1 to the ground so that it turns on the output pnp transistor during the negative (output) cycle.

in otherwords, I don't think the circuit would have worked if you took out t1.

your thoughts?

millwood

原帖由 激光鼠 于 2007-11-23 00:03 发表

我在AD网站上找到了，谢谢你

great. you may want to delete the email from your inbox then.

enjoy.

millwood

原帖由 locky_z 于 2007-11-22 23:54 发表
刚才再仔细去看了一下Walter Jung那本书，的确比Ti的深入，讲解内部电路较多较好

it also goes a lot into the history of various op amp / topologies and their applications, with a slight focus on audio / dsl.

great read, I think.