Define the feedback configuration.Choose from series-shunt feedback,series-series feedback, shunt-shunt feedback and shunt-series feedback Feedback configuration: Measure the effective value closed-loop) (1)Unloaded Vk6=( )'x20=( ）A=( ) (2)Loaded by 3.6K Vx6=( )Vk20=( )4=( 3.Stability of A Decrease supply voltage to 10V.Compare change of 4 of open-loop circuit and in closed-loop circuit. Power supply 4 (open-loop) 4(closed-loop) 12V 10VDefine the feedback configuration. Choose from series-shunt feedback, series-series feedback, shunt-shunt feedback and shunt-series feedback Feedback configuration: Measure the effective value ( closed- loop) (1)Unloaded 6 20 ( )( )( ) VV A KK V  (2)Loaded by 3.6K 6 20 ( )( )( ) VV A KK V  3. Stability of AV Decrease supply voltage to 10V. Compare change of AV of open-loop circuit and in closed-loop circuit. Power supply AV (open-loop) AV (closed-loop) 12V 10V