Title :
An analog linearizer using second harmonic signals feedforwarding
Author :
Kim, Sung Yong ; Jang, Mi Ae ; Jeon, Ki Kyung ; Kim, Young ; Jeong, Yong Chae
Author_Institution :
Sch. of Electron. Eng., Kumoh Nat. Inst. of Technol., Gyungbuk, South Korea
Abstract :
In this paper, an analog linearizer using second harmonic signals feedforwarding is proposed. The harmonic generator of the proposed linearizer that consists of a small signal amplifier extracts second harmonic signals. A vector modulator, modulate fundamental signal with second harmonic signals, makes the inverse third order intermodulation distortion (IMD3) signals of power amplifier and controls amplitude/phase of them with modulation factors. As a result, this linearizer is suppressed IMD3 signals of power amplifier effectively. The test results show that IMD3 signals of power amplifier are suppressed more than 20 dB for CW two-tone signals. Also, it improved the adjacent channel power ratio (ACPR) more than 7dB for CDMA (IS-95) signals.
Keywords :
feedforward; intermodulation distortion; linearisation techniques; power amplifiers; CDMA signals; CW two-tone signals; adjacent channel power ratio; analog linearizer; harmonic generator; inverse third order intermodulation distortion signals; modulation factors; power amplifier; second harmonic signals feedforwarding; signal amplifier; vector modulator; Amplitude modulation; Intermodulation distortion; Multiaccess communication; Phase modulation; Power amplifiers; Power generation; Power harmonic filters; Power system harmonics; Radio frequency; Signal generators;
Conference_Titel :
Microwave Conference, 2005 European
Print_ISBN :
2-9600551-2-8
DOI :
10.1109/EUMC.2005.1610260
