Title :
Multiband and Wide Dynamic Range Digital Polar Transmitter Using Current-Mode Class-D CMOS Power Amplifier
Author :
Nakatani, Takeshi ; Kimball, D.F. ; Asbeck, P.M.
Author_Institution :
Dept. of Electr. & Comput. Eng., Univ. of California San Diego, La Jolla, CA, USA
Abstract :
Techniques are demonstrated to extend the power control dynamic range of a digitally-driven 0.15 um CMOS polar power amplifier to the degree needed for WCDMA handset applications. The output frequency can be tuned over the 0.75-2GHz range, using an on-chip band-switching resonator, and output power of 27-29 dBm is attained. By partitioning the switching PA into multiple 3-state unit cells, power dynamic ranges of 91 / 85 dB are achieved at 0.85 / 1.75 GHz while maintaining high efficiency. By introducing a buck converter that can act not only with pulse width modulation but also in charge sampling mode, the overall DC power consumption in the power back- off regime can be reduced by a factor of approximately 0.7.
Keywords :
CMOS analogue integrated circuits; UHF power amplifiers; code division multiple access; current-mode circuits; power convertors; radio transmitters; resonators; DC power consumption; WCDMA handset applications; buck converter; charge sampling mode; current-mode class-D CMOS power amplifier; digitally-driven CMOS polar power amplifier; frequency 0.75 GHz to 2 GHz; multiband digital polar transmitter; multiple 3-state unit cells; on-chip band-switching resonator; output frequency; output power; power back-off regime; power control dynamic range; power dynamic ranges; pulse width modulation; size 0.15 mum; switching PA; wide dynamic range digital polar transmitter; CMOS integrated circuits; Dynamic range; Impedance matching; Power amplifiers; Power generation; Resonant frequency; Transmitters;
Conference_Titel :
Compound Semiconductor Integrated Circuit Symposium (CSICS), 2013 IEEE
Conference_Location :
Monterey, CA
DOI :
10.1109/CSICS.2013.6659240
