Signal amplifier, wireless transmitter and method thereof

PURPOSE: A signal amplifier, a wireless transmitter, and a method thereof are provided to increase amplifier efficiency by supplying a bias to an amplifier based on size change of a pulse quantization signal. CONSTITUTION: A signal amplification device(10) comprises a signal modulation part(100), a bias generating part(120), and a signal amplification part(130). The signal modulation part outputs a digitized multilevel quantization signal by quantizing an envelope signal into a multilevel. The bias generating part tracks size modulation of a pulse quantization signal inputted into the signal amplification part. The bias generating part provides a bias to the signal amplification part based on the tracking result. The signal amplification part amplifies the pulse quantization signal in which the multilevel quantization signal and a phase signal are combined. [Reference numerals] (100) Signal modulation part; (120) Bias generating part; (130) Signal amplification part