> The example circuit for the LTC4446 dual gate driver IC
> has the lower fet connected to ground; it seems like it
> should be possible to reference it to a negative supply...
If you use an isolated part like the UCC21520, you can place the high and low side FET drivers wherever you like.
Yes, you can have intermediate levels, with isolated drivers and back-to-back MOSFETs, as shown in Fig 3x.115.
Thanks, is that reference for AoE III or AoE X-treme?
In my brief time fiddling with some two-stage linear power-booster ideas e.g. something like this:
but class-AB complimentary with a grounded-gate JFET appropriately biased and complimentary MOSFETs driving the output from their drains, wrapping feedback around to a fast op-amp, 1-2MHz 50V P2P is easy in a simulation, but getting to 5MHz delivering a couple watts into a load eludes me it would require much more careful thought on component selection particularly the Cgs of the output fets. Annoying.
If a linear power booster of that spec was needed it might be more plausible to drive the output devices directly from tapping the supply like the classic:
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