>cycle and the modulation is done only by varying the phase between the
>totem pole drivers 0 - 180 degrees.

I am not familiar with that totem pole scheme, but, isn't it dangerous to
drive a totem pole with 0 degrees ? Wouldn't both the Fet (transistors,
whatever) be brought in conduction state at the same time ? Or is there
a current limiting device ?  Just curious...

73  Alberto  I2PHD