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【简答题】
电路如题 31 图所示, U BE = 0.7V , ß = 100 , R P 调为 71kΩ. ( 1 )试求电路的静态工作点 I BQ 、 I CQ 和 U CEQ 。 ( 2 )试求该电路接上负载时的电压放大倍数 A u = U o / U i ( r be 取 1.5kΩ )。 ( 3 )试求该电路的输出电阻 r o 。 ( 4 )当 U S = 122mV 时,测得 U i = 20mV ,则电路的输入电阻 r i = ?
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