s3-3 Voltage follower(跟随器)( or isolator隔离器) The voltage follower is a circuit in which the output is identical to the input 19x=b D1 D1 ∴U2=U1,0r =1 The controlled-source representation of the voltage follower.§3-3 Voltage follower（跟随器） (or isolator隔离器) The voltage follower is a circuit in which the output is identical to the input. 2 =1 , 1 , 1 2 2 1 1 2  = = = =         or x x The controlled-source representation of the voltage follower: − +  1 − + − +  1  2  x − +  1  • − +  2 + + −