摆率和GB的关系

sodede · 发表于 2013-10-11 17:44:50

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如题：知道GB（单位增益带宽）越大，摆率（slew rate）越大。但是，不是很清楚具体关系。如果有他俩转换的公式就好了。

semico_ljj · 发表于 2013-10-11 21:38:48

不是完全对应的

xjf20072608 · 发表于 2013-10-11 21:57:49

回复 1# sodede

SR = GBW * Vov

JoyShockley · 发表于 2013-10-11 22:10:58

回复 3# xjf20072608

楼上正解。
  以最简单的五管双入单出放大器为例：

  SR=Id/CL；wu=gm/CL；Vov=2（0.5Id）/gm=Id/gm

  SR=Vov*wu

199619919 · 发表于 2013-10-12 03:53:36

Slew Rate is the rate of charging up load capacitor when the output swing is large, so it depends on how large the load cap is and how strong the current is. GBW is gain times bandwidth. Bandwidth is decided by load cap, and gain is decided by gm (which set the current) and load res. This is why SR and GBW are correlated. Note that they don't have specific relationship.

wfcawy · 发表于 2013-10-12 08:15:49

回复 4# JoyShockley

It is true for the slew rate of discharging capacitor with first order assumption.

If it is the case of charging capacitor,you need to take the second pole into consideration.

[讨论] 摆率和GB的关系

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