21 ?? ?
2211 iRiRor ?
2i1i
?
?
1?
?
?
2?
NIC
2?
2i
1i
?
?
1?
? ?
?
?
1i 1
R
2R2i
?
?
§ 13-8 NIC (Negative-impedance converter（ 负阻抗变换器 ） )
22 iR L???
)1(21 ?? ?
)2(2211 iRiR ?
222
2
22
2
11
1
R
R
iR
iR
iRiR
LL ????? ??
2
1
1
1
R
RR
i
L???
??11 / i? input resistance
Example:
The application of NIC
R R?
NIC?
? 0R
??
??Telephone wires
1 2
2i1i
?
?
1?
?
?
2?
LR
NIC