Patent ID: 8693578

Claim:
A transmission device for amplifying and transmitting an input signal including an amplitude component and a phase component, the transmission device comprising: a pulse-modulated signal generator that generates a pulse-modulated signal by changing a width of a pulse or density of a pulse according to magnitude of the amplitude component of the input signal while discretely changing a height of the pulse according to the magnitude of the amplitude component of the input signal; a modulated signal generator that integrates the pulse-modulated signal and the phase component of the input signal to generate a modulated signal having an amplitude level that discretely changes according to a height of a pulse of the pulse-modulated signal; a power amplifier that includes at least as many amplifiers as the number of discrete amplitude levels of the modulated signal, combines outputs of operating amplifier and outputs a combined output, wherein the number of the operating amplifier that amplify the modulated signal from among the increases as an amplitude level of the modulated signal increases; and a filter that eliminates a square-wave component from the output of the power amplifier.