Title :
Highly efficient and wideband digital quadrature transmitter
Author :
Dongsu Kim ; Hadong Jin ; Sangsu Jin ; Bumman Kim
Author_Institution :
Dept. of Electr. Eng., Pohang Univ. of Sci. & Technol., Pohang, South Korea
Abstract :
A digital quadrature transmitter employing RF DACs, with an array of class-D PA and a distributed capacitor power combiner, directly generates RF signal from digital I and Q signals. Employing a disable opposite cell technique on this RF DAC enables good performances. The measured drain efficiencies and total efficiencies of the implemented transmitter are 14.4/11.0/10.6% and 10.8/6.7/6.3% at peak output power of 7.87/0.26/-0.11 dBm for CW/LTE 5-MHz/LTE 10-MHz signals, respectively.
Keywords :
Long Term Evolution; capacitors; radio transmitters; CW-LTE signals; RF DAC; RF signal; class-D PA; digital I signals; digital Q signals; distributed capacitor power combiner; frequency 10 MHz; frequency 5 MHz; wideband digital quadrature transmitter; Capacitors; Impedance; Linearity; Power generation; Radio frequency; Radio transmitters; Digital transmitter; LTE; RF DAC; quadrature transmitter;
Conference_Titel :
Microwave Symposium Digest (IMS), 2013 IEEE MTT-S International
Conference_Location :
Seattle, WA
Print_ISBN :
978-1-4673-6177-4
DOI :
10.1109/MWSYM.2013.6697339
