[TCML] Class-E tuning: primary current going negative as MOSFET turns on

[Andreas Hahn <andreas.hahn@xxxxxxxxxxx>]

Right now the current in the primary (measured in the lead between MOSFET 
and primary) hits approximately zero just as the voltage at the MOSFET 
gate starts ramping up. It takes about 0.5uS for the MOSFET gate to reach 
full voltage, during which time the current in the primary goes negative.

Is this to be expected -- as the current has to go negative in order to 
charge up the capacitor -- or is there still some room for tuning?

The reason I ask is that on Steve Ward's page 
(http://stevehv.4hv.org/classEsstc.htm) he writes that the ideal waveform 
means "the reverse diode [in the MOSFET] is not conducting (at least not 
any appreciable current)."

(After all this happens, the current actually spikes downward just before 
the MOSFET gate voltage dives to zero. When the MOSFET gate dives to zero, the current jumps very 
positive and the cycle starts all over again.

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