Title :
Improved Envelope Injection and Termination (EIT) RF Power Amplifier With Envelope Equalization for Mobile Terminal Applications
Author :
Kheirkhahi, Alireza ; Yan, Jonmei J. ; Asbeck, P.M. ; Larson, Lawrence E.
Author_Institution :
Dept. of Electr. & Comput. Eng., Univ. of California at San Diego, La Jolla, CA, USA
Abstract :
An improved envelope equalization technique to enhance the efficiency of envelope injection and termination RF power amplifiers (PAs) is proposed. A TriQuint heterostructure field-effect transistor PA, which draws 100 mA from an 8.0-V supply and provides maximum power of 28 dBm for a continuous-wave input at 1.95 GHz, exhibits a significant improvement in the maximum linearity compliant efficiency from 21% to 28% using the proposed technique for an uplink WCDMA signal with 6.9-dB peak-to-average power ratio. The equalization improves the amplifier linearity by reducing the clipping distortion extending the maximum linear output power by more than 1 dB. A technique to maintain high efficiency, even at low average powers, is also described.
Keywords :
UHF power amplifiers; code division multiple access; high electron mobility transistors; mobile radio; telecommunication terminals; amplifier linearity; clipping distortion reduction; current 100 mA; efficiency 21 percent to 28 percent; frequency 1.95 GHz; improved EIT RF power amplifier; improved envelope equalization technique; improved envelope injection-termination RF power amplifier; maximum linear output power; maximum linearity compliant efficiency; mobile terminal application; peak-to-average power ratio; termination RF PA; triquint heterostructure field-effect transistor PA; uplink WCDMA signal; voltage 8.0 V; Bandwidth; Impedance; Linearity; Multiaccess communication; Radio frequency; Spread spectrum communication; Uplink; Digital predistortion (DPD); RF power amplifier (PA); dual-resonance network; efficiency enhancement; envelope equalization; envelope injection and termination (EIT) amplifier; handset; intermodulation distortion; large-signal analysis; uplink WCDMA;
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
DOI :
10.1109/TMTT.2013.2295552
