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【单选题】
下图所示电路中,各电容对交流信号呈短路。已知3DG6的 β =50, V BE(on) =0.7V, r bb ′ = 50Ω, V A =∞。其他电路参数如图中所示。 该电路的电压增益Av输入电阻R i 以及输出电阻R o 分别约为( )。A.
-88,16.7Ω,3kΩ;
B.
-88,3kΩ,16.7Ω;
C.
88,16.7Ω,3kΩ;
D.
88,3kΩ,16.7Ω。
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