Patent ID: 8410851

Claim:
A method of obtaining an output signal from a direct current (DC) voltage, wherein the output signal is a linearly amplified replica of an input signal having first and second polarities, comprising the steps of: receiving the input signal; transforming and pulse modulating the input signal for generating a pulse modulated signal, wherein said transforming is based on that when applying the direct current (DC) voltage across an inductor means, the energy stored in the inductor means is proportional to square of time of said applying; switching a current from the direct current (DC) voltage to the inductor means according to the pulse modulated signal; blocking a current from the inductor means to a filter when the current from the direct current (DC) voltage to the inductor means is switched on and conducting the current from the inductor means to the filter when the current from the direct current (DC) voltage to the inductor means is switched off; filtering said current from the inductor means for outputting the output signal by the filter.