14-4 Line spectrum A plot showing each of harmonic amplitudes in the wave is called the line spectrum

1.A functionf(t) is said to be even iff(t)=(-t). They are symmetrical with respect to the vertical axis. (bn=0)

S14-2 Exponential Fourier series f(t)=+ cosot+a2 cos 2ot+.] sinot+ b2 sin

Any periodic waveform f(t)f(t) can be expressed by a Fourier series provided that (1) If it is discontinuous, there are only a finite number of discontinuous in the period T (2)It has a finite average value over the period T (3)It has a finite number of positive and negative maximums in the period T

13-8nic(Negative-impedance- converter(负阻抗变换器))

current of one port into the voltage of the otherport and vice verse. U1 =-ais \2 =ai..gyration constant

13-6 Interconnection of two-ports 1. Series connection

the open-circuit reverse voltage gainthe open-circuit transfer admittancethe short-circuit transfer impedancethe short-circuit reverse current gain

the short-circuit input impedance I12=0 the short-circuit forward current gain I1V2=0 Let 1=0 he open-circuit reverse voltage gain I1=0 the open-circuit output admittance

are parameters The matrix from of parameter equations: