一晶体管组成的单回路中频放大器,如图所示。已知f o =465kHz,晶体管经中和后的参数为:g ie =0.4mS,C ie =142pF,g oe =55μS,C oe =18pF,Y ie =36.8mS,Y re =0,回路等效电容C=200pF,中频变压器的接入系数p 1 =N 1 /N=0.35,p 2 =N 2 /N=0.035,回路无载品质因数Q 0 =80,设下级也为同一晶体管,参数相同。试计算: (1)回路有载品质因数Q L 和3dB带宽BW; (2)放大器的电压增益; (3)中和电容值。(设C b′c =3pF)