Modern wireless communication systems tend to use amplitude modulation as well as phase modulation to achieve high data rates. This high data rate results in large Peak to Average Power Ratio (PAPR) forcing the power amplifier to operate at large power back-off in order to satisfy the linearity requirements. Envelope tracking (ET) is considerably effective in maintaining the linearity while enhancing the efficiency at large power back-offs. Linearity and efficiency enhancement of the envelope modulator as the main building block of the ET architecture is very important. In this thesis a new digitally controlled parallel ltr" Keywords: RF power amplifier, linearization, envelope tracking, envelope modulator, digital controller
