Title :
Envelope tracking RF power amplifier with lead-lag modulator
Author :
Watkins, Gavin T. ; Mimis, Konstantinos
Author_Institution :
Toshiba Res. Eur. Ltd., Bristol, UK
Abstract :
Envelope tracking (ET) can increase RF Power Amplifier (PA) efficiency by manipulating its supply voltage in harmony with the transmitted signal. The lead-lag modulator described here uses a switched mode power supply (SMPS) for the low frequency envelope content and a linear amplifier (LA) with a synthetic output impedance for the high. When tested with an 8 dB peak-to-average power ratio (PAPR) 5 MHz bandwidth 3GPP Long Term Evolution (LTE) signal, the complete PA achieved a DC-to-RF efficiency of 46% at 6 W output power with a first channel adjacent channel power ratio of -27 dBc.
Keywords :
Long Term Evolution; modulators; radiofrequency power amplifiers; switched mode power supplies; 3GPP Long Term Evolution signal; LTE signal; RF power amplifier; SMPS; bandwidth 5 MHz; efficiency 46 percent; envelope tracking; lead-lag modulator; linear amplifier; low frequency envelope content; power 6 W; supply voltage; switched mode power supply; transmitted signal; Frequency modulation; Gain; Impedance; Lead; Power amplifiers; Radio frequency; Active circuits; amplifiers; energy efficiency; power amplifier switched mode power supply;
Conference_Titel :
Power Amplifiers for Wireless and Radio Applications (PAWR), 2015 IEEE Topical Conference on
Conference_Location :
San Diego, CA
DOI :
10.1109/PAWR.2015.7139206
