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【简答题】
单调谐放大器如图题2.10所示。已知工作频率f 0 =10.7MHz，回路电感L 13 =4uH，Q 0 =100，N 13 =20，N 23 =6，N 45 =5。品体直流工作点和工作频率为10.7MHz时，其y参数为y ie =(2.86+j3.4)mS，y rc =(0.08 -j0.3)mS，y fe -(26.4 -j36.4)mS，y oe =(0.2+j1.3)mS。 (1)忽略y re 时，试求：电容C的大小；单级电压增益A u0 通频带2△f 0.7 和矩形系数K r0.1 ；四级相同放大器的总电压增益、通频带和矩形系数。 (2)考虑y re 时，若S≥5，试求电压增益A u0 并判断说明此放大器是否稳定。
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