Title :
High-linearity CMOS feedforward power amplifier for WiMAX application
Author :
Liao, Hsien-Yuan ; Chen, Jhih-Hong ; Chiou, Hwann-Kaeo ; Chen, Cheng-Chung
Author_Institution :
Dept. of Electr. Eng., Nat. Central Univ., Jhongli
Abstract :
A high-linearity CMOS feedforward power amplifier has been proposed. The class-C and class-AB amplifiers were combined to perform a differential circuit, which was utilized as the error amplifier to cancel the third-order nonlinear signal with the main amplifier. Therefore, the linearity of the feedforward power amplifier was improved. At the operation frequency of 2.6 GHz, the measured output IP3 and ACPR are 33.2 dBm and -59 dBc, respectively. Thus, the feedforward architecture is very suitable for high linear power amplifier design.
Keywords :
CMOS integrated circuits; WiMax; power amplifiers; WiMAX application; class-AB amplifiers; class-C amplifiers; frequency 2.6 GHz; high-linearity CMOS feedforward power amplifier; third-order nonlinear signal; Circuit testing; Differential amplifiers; High power amplifiers; Linearity; Microwave technology; Power amplifiers; Power measurement; Radio frequency; Radiofrequency amplifiers; WiMAX;
Conference_Titel :
Microwave Conference, 2008. APMC 2008. Asia-Pacific
Conference_Location :
Macau
Print_ISBN :
978-1-4244-2641-6
Electronic_ISBN :
978-1-4244-2642-3
DOI :
10.1109/APMC.2008.4958350
