t>T21(t)=l2(o)+2(0)-u2()le u, (0+=u(T)=1-e RCy We2(00)=OV T=RC ue(t) 2(t)=(1-e)e"CV,t>T t uR2(t=-ue2(tv, t>T e RC RC A. t>T R2. t >T RCt c c c c u t u u u e − + ( ) = (  ) + [ ( 0 ) − ( )] 2 2 2 2 u u T e RC V T c c − + 2 ( 0 ) = 1 ( ) = 1 − u c 2 (  ) = 0 V  = RC u t e e V t T RCt T RCT c = −  − − − ( ) ( 1 ) , 2 u R 2 ( t ) = − u c 2 ( t ) V , t  T e A t T Re i t RC RC t T  − = − − − , 1 ( ) 1 u c (t ) u R (t ) t 0