§13-8NIC( Negative-impedance converter(负阻抗变换器)) NC 十 R or i E R1 =2 1 1 2 2 or R i = R i 2 i 1 i − +  1 − +  2 NIC  2 2 i 1 i − + 1   + + 1 i R1 R2 2 i − + §13-8 NIC (Negative-impedance converter（负阻抗变换器）)