Title :
Highly Linear Predistortion Power Amplifiers With Phase-Controlled Error Generator
Author :
Lee, Yong-Sub ; Lee, Seung-Yup ; Jeon, Kye-Ik ; Jeong, Yoon-Ha
Author_Institution :
Dept. of Electron. & Electr. Eng., Pohang Univ. of Sci. & Technol., Gyoungbuk
Abstract :
A simple predistortion technique to cancel the fifth-order intermodulation (IM5) as well as third-order intermodulation (IM3) components using a third-order predistorter (PD) is represented. The IM3 and IM5 components are cancelled out simultaneously by their same magnitude and phase difference in the PD and power amplifier (PA). Moreover, this phase difference is controlled by using the phase-controlled error generator in the PD. For experimental verification, a third-order PD has been implemented and tested in a 30-W class-AB PA at the wide-band code division multiple access (WCDMA) band of 2.11-2.17GHz. Two-tone test results show that significant cancellation of the IM3 and IM5 components can be obtained. For a four-carrier WCDMA application, significant adjacent channel leakage ratio improvement is achieved over a wide range of output power levels
Keywords :
code division multiple access; intermodulation distortion; phase control; power amplifiers; 2.11 to 2.17 GHz; 30 W; ACLR; WCDMA; adjacent channel leakage ratio; highly linear predistortion power amplifiers; intermodulation; phase controlled error generator; phase difference; predistorter; two tone test results; wide band code division multiple access; Broadband amplifiers; High power amplifiers; Linearity; Multiaccess communication; Power amplifiers; Power generation; Predistortion; Radio frequency; Testing; Wideband; Adjacent channel leakage ratio (ACLR); error generator; intermodulation (IM); phase; power amplifier (PA); predistorter (PD); wide-band code division multiple access (WCDMA);
Journal_Title :
Microwave and Wireless Components Letters, IEEE
DOI :
10.1109/LMWC.2006.885638
