Patent ID: 6917242

Claim:
A power amplifier comprising: pulse modulation means for supplying: a first pulse signal obtained by outputting alternately, and at reference intervals equal to a reference period, a first pulse modulation signal (+PA) indicating a level of an input signal, and a second inverted pulse modulation signal (−PB) obtained by level-inverting a second pulse modulation signal which indicates a complement of the level of the input signal, and a second pulse signal obtained by outputting alternately and at the reference intervals the second pulse modulation signal (+PB) indicating the complement of the level of the input signal and a first inverted pulse modulation signal (−PA) obtained by level-inverting the first pulse modulation signal which indicates the level of the input signal; a first output circuit comprising a first switching element, supplying a switching output according to the first pulse signal supplied by from the pulse modulation means; and a second output circuit comprising a second switching element, supplying a switching output according to the second pulse signal supplied by from the pulse modulation means, and characterized in that a load is connected between an output end of the first output circuit and an output end of the second output circuit.