请教一个问题 T型匹配与 ∏ 型匹配的区别?

Rainbow

请教各位牛人.

zhangst2000

同意楼上的。英语解释未必就是在炫耀，我觉得是在锻炼。

hehehaha

<P>没有什么区别。</P><P>但是恁感觉，好象，如果是PI型的，元器件的值比较好选。</P>

306970

<b>T型匹配与 ∏ 型匹配是两种匹配的形式, 在工作过程中感觉∏ 型比T型容易匹配些.</b>

doubaobao

可以请高人具体谈谈吗？[em07]

cylbailey

In fact, T style seems better than ∏ style, especially in mobile handset PCB

Rainbow

What is the advantage that T style Compare to  ∏ style matching?Could you give more details?

秦川牛

如果衰减值比较大的花，用T形的好一点

woshifanka

<P>1. Type T is better than Type Pi if the DC blocking to the next block is concerned.(eg::Antenna does not need DC blocking for no next block , suggest using  Type Pi.) </P><P>2. Type Pi is batter than type T if the spray reatance in the input of next block is cobcerned.</P><P>As a matter of fact ,T and Pi type of block can be converted from each other.</P>

yellowtoot

<DIV class=quote><B>以下是引用<I>woshifanka</I>在2006-3-13 11:07:00的发言：</B>

<P>1. Type T is better than Type Pi if the DC blocking to the next block is concerned.(eg::Antenna does not need DC blocking for no next block , suggest using  Type Pi.) </P>
<P>2. Type Pi is batter than type T if the spray reatance in the input of next block is cobcerned.</P>
<P>As a matter of fact ,T and Pi type of block can be converted from each other.</P></DIV>


spray reatance 是什么东东啊?
cobcerned呢?

为什么中国人非要写英语, 而且还写得连字典都查不到.
[em13]

西门飘雪

<P>主要是Q和带宽不同去考虑.T行带宽不大!</P>

ftl1015

<DIV class=quote><B>以下是引用<I>yellowtoot</I>在2006-3-16 21:56:00的发言：</B>



spray reatance 是什么东东啊?
cobcerned呢?

为什么中国人非要写英语, 而且还写得连字典都查不到.
[em13]</DIV>

[em28]
[em02]哈哈说得好

woshifanka

不好意思，一时打错了．应该是：reactance,concerned.[em07][em14]

shadow

T型的Q值是不可选的，是网络定的；<b> ∏型则可以达到较高的Q值。</b>

xiaoyu_G

<P>pi型的如果最后是一个电感，可以抑制直流的纹波干扰。</P>

john_li

Agree with <b><FONT color=#000066>西门飘雪,please note the two architecture difference:the load and the source will effect the Q value,off course the bandwidth will change according to the above reason.</FONT></b>

keithen

大家不要阻碍别人用英语,如果看不懂英文的,那你就得好好学习学习,不能妨碍别人的进步.

aquasnake

typing english is more speedy

[upload=gif]UploadFile/2007-11/071115@52RD_未命名2e3.GIF[/upload]

criterion

以下是引用Rainbow在2006-2-13 16:07:00的发言：
请教各位牛人.

以Matching观点的话
T型跟pi型  比L型更能拓展Matching的带宽
也就是不同频率的阻抗相差程度小
至于啥时该用T   啥时该用Pi
可以由原始负载阻抗决定
(也就是不加任何Matching组件  单单只串联0奥姆  看纯粹PCB Trace的负载阻抗)

<img src="attachments/dvbbs/2012-8/20128251140826381.jpg" border="0" onclick="zoom(this)" onload="if(this.width>document.body.clientWidth*0.5) {this.resized=true;this.width=document.body.clientWidth*0.5;this.style.cursor='pointer';} else {this.onclick=null}" alt="" />

不过手机的参考电路   一般是以pi型居多
不论高通平台   还是MTK平台

peter_chao

T型网络匹配的阻抗区域有限，Pi型可以匹配任意阻抗区域至50ohm