5.3负反馈放大器的分析与计算 53.1四种类型负反馈放大器的电压增益A (1)电压串联负反馈A (2)电压并联负反馈As46 R R (3)电流串联负反馈Ad R &fs (4)电流并联负反馈AsAs V R R S S5.3 负反馈放大器的分析与计算 5.3.1 四种类型负反馈放大器的电压增益Avfs (1)电压串联负反馈 Avfs (2)电压并联负反馈 Arfs rfs s s s o s o vfs A R i R v v v A 1 = = = (3)电流串联负反馈 Agfs ' ' gfs L s c L s o vfs A R v i R v v A = = = (4)电流并联负反馈 Aifs ifs s L s s o L s o vfs A R R R i i R v v A = = = '