※ 引述《msu (do my best)》之銘言：
: 有一題如下
: An Amplifier with inverting circuit intended for very-high frequency operation
: yet characterized by a single-pole roll-off,has ft=100MHz and Ao=20v/v.
: For a design in which theh th actual(rather than the nominal) closed-loop
: gain is -10v/v.
: What 3db frequency results?
: 請問各位這題如何解呢?
: 感謝
先畫出基本inverter stage 此為非理想
用KCL 求出
set X=R2/R1 (就那兩顆電阻)
-X
Af= Vo/Vi= ____________
1+ (1+X)/Ao 帶入數字 get X=21
f3db=ft/(1+X) 帶入數字get f3db=4.54545454MHz
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