A flexible insulation blanket having a ceramic matrix composite outer layer, and a method of producing a flexible insulation blanket having a smooth, aerodynamically suitable, outer surface by infiltrating ceramic material within the outer ceramic fabric layer of the flexible insulation blanket and curing the ceramic material to form a CMC layer. The linearization circuit 6 outputs a charge pump current control signal CPCONT, depending on a potential level of the oscillation frequency control signal VT. Power may also be provided via one or more wireless power techniques.