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Previous studies led by the authors yield a maximum operating frequency value for a class E amplifier considering a linear capacitance shunting the device. This linearity also appears in most classical mathematical analyses published so far. This paper faces the problem of finding a linear equivalent capacitance (easy to handle) of the nonlinear voltage-dependent output capacitance of the semiconductor device. A novel definition for equivalence is herein presented, as well as further important consequences in the class E amplifier's normalisation and design and in the frequency scheme.