344 D.C. link frequency changers lor JT E 0.022[ f$ = 40 ps I 3 0.020- 30 ps 0.018- 25 ps PO E.g 0.016- 20 ps 3 0.014. =E / 15 ~s E B mo 0.012 - / 10 ps 3 2 0.010 - c E 0.008 - 5 IJS s 0.006 - al 2 0.004 - b- 0.002 -