Title :
A 40-MHz 85.8%-peak-efficiency switching-converter-only dual-phase envelope modulator for 2-W 10-MHz LTE power amplifier
Author :
Sankman, Joseph ; Min Kyu Song ; Dongsheng Ma
Author_Institution :
Integrated Syst. Design Lab., Univ. of Texas at Dallas, Dallas, TX, USA
Abstract :
In conventional envelope modulators, a linear regulator is required to attain fast tracking, but it is a significant source of efficiency degradation. To eliminate the linear regulator, a dual-phase switching converter with synchronized adaptive voltage tracking (SAVT) control is employed. The SAVT control enables synchronization and fast hysteretic response for voltage tracking. To overcome the switching converter slew rate limit, a push-pull slew rate enhancer is implemented. The modulator is fabricated with a 0.18μm process and achieves 85.8% peak efficiency tracking a 10MHz LTE envelope.
Keywords :
Long Term Evolution; VHF amplifiers; modulators; radiofrequency power amplifiers; switching convertors; synchronisation; LTE power amplifier; SAVT control; efficiency 85.8 percent; efficiency degradation; frequency 10 MHz; frequency 40 MHz; hysteretic response; linear regulator; push-pull slew rate enhancer; size 0.18 mum; switching converter slew rate limit; switching-converter-only dual-phase envelope modulator; synchronized adaptive voltage tracking control; Abstracts; Feedback control; Noise; Phase modulation; Regulators; Switches; Synchronization;
Conference_Titel :
VLSI Circuits Digest of Technical Papers, 2014 Symposium on
Conference_Location :
Honolulu, HI
Print_ISBN :
978-1-4799-3327-3
DOI :
10.1109/VLSIC.2014.6858440
