Title :
A basic study on EER transmitter with burst-width envelope modulation based on triangle-wave PWM
Author :
Kodera, Toshiro ; Ando, Nobuhiko ; Taromaru, Makoto
Author_Institution :
ATR Hikaridai 2-2-2 Keihanna Sci. City, Kyoto
Abstract :
The improvement of efficiency on power amplifiers (PAs) has been a major assignment from dc to microwave region. The class-E and F PAs, overdriven amplifiers with harmonics control are well known scheme to obtain the high efficiency on microwave PA. However, significant deterioration as same as the conventional amplifier is specifically inevitable issue in the linear operation. These facts draw efficiency reduction and modulation inaccuracy on the high backoff modulation such as OFDM. Recently, EER (envelope elimination and restoration) and polar modulation are widely researched as a solution for these issues. In this work, a novel EER transmitter with burst-width modulation driven class-E amplifier system is verified on 64 QAM signal of 2.3GHz. As a result, it is confirmed that basic parameters on PA, EVM and ACLR are simultaneously improved.
Keywords :
UHF power amplifiers; pulse width modulation; quadrature amplitude modulation; radio transmitters; EER transmitter; UHF power amplifiers; adjacent channel leakage ratio; burst-width envelope modulation; envelope elimination and restoration; frequency 2.3 GHz; harmonics control; overdriven amplifiers; pulse width modulation; quadrature amplitude modulation; Amplitude modulation; Degradation; Delay; Filters; Microwave amplifiers; OFDM modulation; Power amplifiers; Pulse width modulation; Signal restoration; Transmitters; Ceramics; coaxial resonators; delay filters; delay-lines; power amplifiers;
Conference_Titel :
Microwave Conference, 2007. KJMW 2007. Korea-Japan
Conference_Location :
Okinawa
Print_ISBN :
978-1-4244-1556-4
DOI :
10.1109/KJMW.2007.4402225
