Patent ID: 8432221

Claim:
A method of obtaining an output signal which is a linearly amplified replica of an input signal having first and second polarities, comprising the steps of: receiving the input signal; pulse modulating the input signal for getting a pulse modulated signal; switching a first switching unit for getting a first pulsed voltage from a direct current (DC) voltage supply unit according to the pulse modulated signal when the polarity of the input signal is positive; keeping the energy transmission from the first pulsed voltage to the output signal during the switching off period of the first switching unit via switching on a first switchable free-wheeling diode means unit coupled to the first switching unit and using the first switchable free-wheeling diode means unit to provide a proper current path for the energy transmission when the polarity of the input signal is positive; switching a second switching unit for getting a second pulsed voltage from the direct current (DC) voltage supply unit according to the pulse modulated signal when the polarity of the input signal is negative; keeping the energy transmission from the second pulsed voltage to the output signal during the switching off period of the second switching unit via switching on a second switchable free-wheeling diode means unit coupled to the second switching unit and using the second switchable free-wheeling diode means unit to provide a proper current path for the energy transmission when the polarity of the input signal is negative; filtering the first pulsed voltage, the second pulsed voltage for outputting the output signal.