Title :
PWM based CMOS supply modulator for LTE envelope tracking transmitter
Author :
Jang, Seunghyun ; Ahn, Kyoung-Pyo ; Choi, Yoon-Ho ; Ryu, Nam-Sik ; Park, Bonghyuk ; Hyun, Seok-Bong ; Jung, Jaeho
Author_Institution :
Mobile RF Res. Team, ETRI, Daejeon, South Korea
Abstract :
A PWM based supply modulator on 180nm CMOS process for a high efficiency envelope tracking transmitter is designed. For high efficiency PWM operation, a ramp generator and a non-overlap clock generator are used. With an LTE 20MHz envelope signal with 7.6dB PAPR, the supply modulator shows efficiency of 72.2% with a resistive load of 2ohm.
Keywords :
CMOS integrated circuits; Long Term Evolution; clocks; modulators; pulse width modulation; radio transmitters; LTE envelope tracking transmitter; PWM based CMOS supply modulator; frequency 20 MHz; non-overlap clock generator; ramp generator; size 180 nm; CMOS integrated circuits; Peak to average power ratio; Power amplifiers; Pulse width modulation; Transmitters; Wideband; Envelope tracking; PWM; Power amplifier; Supply modulator;
Conference_Titel :
ICT Convergence (ICTC), 2011 International Conference on
Conference_Location :
Seoul
Print_ISBN :
978-1-4577-1267-8
DOI :
10.1109/ICTC.2011.6082672
