The last installment of Analog Domain derived the value for the Miller capacitance—the effective impedance between the collector and the base of a bipolar transistor in a common-emitter configuration ...

C COMP is a small, layout-dependent capacitor added to compensate for the parasitic capacitance on the inverting input node. Figure 4 plots this circuit's frequency response with and without C COMP.

However, advanced resonant compensation circuits have enabled stable power transfer even at these distances, with coupling capacitance values optimized between 9–10 pF.