R U/R f({U) 0 tniog gniitn19goiint2--lo)<0=(0), i9 2>>(3)|m0年(3)sh (△+0N=(3) Q i△+0=(0) i(t)=f(U=f()+f"(V0)(U-1)+f(0)(U-V0)2+ or i(t)=lot duo △1d2i △2+ 2 duR i i = f () − +  − +  s − + Vs i  •  s / R  s P V0 0 I 0 i = f () int ) , ( 0 ) ( po operating 0 0 static I V P t Let − − → = s  s V s s   | )t( | and 0 )t(  when    + = + = − − i I t i V t Q 0 0 ) (  ) (  • Q  = = 0 + 0 − 0 + ''( 0 )( − 0 ) 2 + 2 1 i(t) f () f (V ) f '(V )( V ) f V  V = +  +  2 + 0 2 2 0 0 2 1 ( )     d V d i d V di or i t I 0 0