在下图所示电路中,已知U CC =U EE =12V,β 1 =β 2 =β=50,r be =6.92kΩ,R C =30kΩ,R B =10kΩ,R E =27kΩ,R W =500Ω,R W 的滑动端处于中点位置,R L =20kΩ,试估算放大器的静态工作点、差模电压放大倍数、差模输入电阻及输出电阻。
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