引入电流负反馈时 d4=R+() F R 1+AF 所取电压已在其 负载效应中考虑 R (1+ AF)R引入电流负反馈时 o o o o f (1 AF)R I U R = = + AF R U I AFI R U I + = = + − 1 ( ) o o o o o o o 所取电压已在其 负载效应中考虑