hellovinay
Newbie level 4
hi
i am struggling with this doubt which i had on differential ampilfier .here goes my doubt
in case of cb amplifiers the ac resistance is small beacause of presence of capacitor which allows ac current as the gain of amplifier is (Rc/re') where Rc is the collector resistance and re' is ac emmiter resistance where Rc>>re'
In a common emitter stage there is an ac path between emitter and ground which normally is of pretty low resistance - resulting in a rather high gain. And you are missing such a path in a differential amplifier.
i am struggling with this doubt which i had on differential ampilfier .here goes my doubt
in case of cb amplifiers the ac resistance is small beacause of presence of capacitor which allows ac current as the gain of amplifier is (Rc/re') where Rc is the collector resistance and re' is ac emmiter resistance where Rc>>re'
In a common emitter stage there is an ac path between emitter and ground which normally is of pretty low resistance - resulting in a rather high gain. And you are missing such a path in a differential amplifier.