Patent ID: 8320846

Claim:
An amplifier comprising: a separating unit that separates a pulse signal into a first separated pulse signal and a second separated pulse signal, a first frequency of the first separated pulse signal and a second frequency of the second separated pulse signal being smaller than a third frequency of a clock signal, a logical OR between the first separated pulse signal and the second separated pulse signal being equal to the pulse signal; a generator that generates a first low speed pulse signal, a second low speed pulse signal, a third low speed pulse signal, and a fourth low speed pulse signal, narrowest pulse widths included in the first low speed pulse signal and the second low speed pulse signal being equal to or wider than twice a width of a narrowest pulse width included in the first separated pulse signal, a logical AND of the first low speed pulse signal and the second low speed being equal to the first separated pulse signal, narrowest pulse widths included in the third low speed pulse signal and the fourth low speed pulse signal being equal to or wider than twice a width of a narrowest pulse width included in the second separated pulse signal, a logical AND of the third low speed pulse signal and the fourth low speed being equal to the second separated pulse signal; a first switching amplifier that amplifies the first low speed pulse signal; a second switching amplifier that amplifies the second low speed pulse signal by using the output of the first switching amplifier as a power-supply to obtain a first output pulse signal that is equal to a logical AND of the first low speed pulse signal and the second low speed pulse signal; a third switching amplifier that amplifies the third low speed pulse signal; a fourth switching amplifier that amplifies the fourth low speed pulse signal by using the output of the third switching amplifier as a power-supply to obtain a second output pulse signal that is equal to a logical AND of the third low speed pulse signal and the fourth low speed pulse signal; and an outputting unit that outputs a logical OR of the first output pulse signal and the second output pulse signal.