A digital oscilloscope (Tektronix TDS7254B) has been used
to capture the time domain waveforms. As for the time domain
current measurements, the exploited system includes an amplifier
(Tektronix TCPA 300) and a current probe with a bandwidth
of 50 MHz (Tektronix A6303). The frequency-domain measurements
have been performed using a spectrum analyzer (Agilent
E4402B), a current probe (Rohde&Schwarz EZ-17), and a voltage
transducer. These measurements cover the range between
10 kHz and 1 MHz