標題: A Variable Gain Envelope Modulator with Hybrid Topology for High Linearity/Efficiency Polar Transmitter Application
作者: Hung, Wei-Ping
Chang, Chia-Hung
傳播研究所
Institute of Communication Studies
關鍵字: Hybrid topology;envelope modulator;polar transmitter;high linearity;high efficiency
公開日期: 2015
摘要: An envelope modulator with hybrid topology for a high linearity and efficiency polar transmitter is described in this paper. The hybrid configuration exhibits a high speed and high efficiency combination by a linear amplifier and a switching amplifier, respectively, thereby improving the power added efficiency(PAE) of the polar transmitter. Moreover, to achieve wideband requirement, an operational trans-conductance amplifier with class AB output stage and variable gain function is designed in the linear amplifier. The switching amplifier adopts a buck converter design. The output dynamic range of envelope modulator shows a 5 dB variable gain with 1 dB resolution. The measured output voltage is from 0 similar to 3.5 V under the supply voltage of 3.5 V. The maximum driving power is 0.991 W for a 20 ohm loading.
URI: http://hdl.handle.net/11536/135915
ISBN: 978-1-4799-8767-2
期刊: 2015 ASIA-PACIFIC MICROWAVE CONFERENCE (APMC), VOLS 1-3
Appears in Collections:Conferences Paper