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A High-Linearity Wideband Power Amplifier With Cascaded Third-Order Analog Predistorters

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4 Author(s)
Yong-Sub Lee ; Dept. of Electron. & Electr. Eng., Pohang Univ. of Sci. & Technol., Pohang, South Korea ; Mun-Woo Lee ; Sang-Ho Kam ; Yoon-Ha Jeong

A high-linearity wideband analog predistortion power amplifier (PA) is presented. The memory effects of the PA are reduced by a high drain bias voltage as well as a wide bias line and several decoupling capacitors. The simple cascaded third-order analog predistorters (CTAPDs) are used to cancel the third- and fifth-order intermodulations (IM3s and IM5s) of the low-memory PA. For verification, the 45 W class-AB PA is implemented and tested using a two-tone signal and a four-carrier wideband code division multiple access (WCDMA) signals at 2.14 GHz. From the measured results, the low-memory PA with the CTAPDs delivers significant IM3 and IM5 cancellation and superior ACLR improvement.

Published in:

Microwave and Wireless Components Letters, IEEE  (Volume:20 ,  Issue: 2 )