共射—共集组合电路图.ewb

Multisim2001软件的仿真电路实例261例

Electronics Workbench Circuit File
Version: 5
Charset: ANSI
Description: 
"共射—共集组合电路图" 
"       主要适用于容性负载场合，将原接于共射级的容性负载，改接于一个共集级的发射极，作为共集级的负载，而以这个增添的共集级作为原共射级的负载。这里以一个共射放大级VT作为容性负载。相当于在两个共射级之间插入一个共集级VT2。" 
"        该电路提高上截止频率的原理是利用共集级的阻抗变换作用。VT的输入电容经共集级的阻抗变换作用，等效到VT2的基极，也就是VT1的集电极的电容大为减小，使得从VT1的基极电压到VT1集电极电压（VT2）的基极电压）的上截止频率为之提高。计算共集级的频率特性时，按VT2基极施加一定压源计算，从VT2发射极看进去的输出阻抗非常之小。它与放大级VT的输入电容组成回路的时间常数很小。整个放大器的上截止频率取决于VT1级由基极到集电极放大特性的上截止频率。" 
"" 

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