Title :
A Wideband Analog Predistortion Power Amplifier With Multi-Branch Nonlinear Path for Memory-Effect Compensation
Author :
Lee, Yong-Sub ; Lee, Mun-Woo ; Jeong, Yoon-Ha
Author_Institution :
Dept. of Electron. & Electr. Eng., Pohang Univ. of Sci. & Technol., Pohang, South Korea
fDate :
7/1/2009 12:00:00 AM
Abstract :
A wideband, multi-branch analog predistorter (MBAPD) is reported to compensate for memory effects as well as memoryless nonlinearity of the power amplifier (PA) for repeater systems with wideband modulated signals. For verification, the MBAPD with three-branch nonlinear path is implemented with a 30 W class-AB PA and tested using a two-carrier wideband code division multiple access (WCDMA) signal with 15 MHz tone spacing at 2.14 GHz. From the measured results at an average output power of 33 dBm, the proposed MBAPD shows the adjacent channel leakage ratios (ACLRs) at plusmn15 MHz offset of -60.4 dBc and -60.2 dBc, which are an improvement of over 25 dB and 12 dB, compared to the PAs without APD and with conventional APD, respectively.
Keywords :
broadband networks; code division multiple access; power amplifiers; MBAPD; adjacent channel leakage ratios; frequency 15 MHz; frequency 2.14 GHz; memory effect compensation; memory effects; memoryless nonlinearity; multi branch nonlinear path; multi-branch analog predistorter; three-branch nonlinear path; wideband analog predistortion power amplifier; wideband code division multiple access; Analog predistorter; delay; memory effects; power amplifier (PA); wideband;
Journal_Title :
Microwave and Wireless Components Letters, IEEE
DOI :
10.1109/LMWC.2009.2022139
