A Fully Integrated Outphasing Transmitter with Inverse Class-D (D-1) Power Amplifier and Transformer-based Power Combiner
Date Issued
2014
Date
2014
Author(s)
Chen, Yi-Chu
Abstract
For the next generation wireless communication, spectral efficiency and power efficiency are main design considerations. The thesis presents a fully integrated outphasing transmitter with inverse Class-D (D-1) power amplifier and transformer-based power combiner. Existing transmitters suffer from low efficiency due to amplitude modulation (AM) path. Utilizing the outphasing technique, the AM path is eliminated. Due to only constant-envelope phase modulation, the non-linear switching power amplifier can be adopted to obtain high power efficiency. In this work, low power phase selector is used in the modulator to realize an efficient phase modulator. On-chip transformer acts as a matching network of power amplifier and power combiner. In this way, area can be reduced. Hence, the outphasing transmitter is integrated fully.
This work presents a 2.4-GHz wireless transmitter which can support 4-QAM, 16-QAM, and 64-QAM. The chip is fabricated in TSMC 90-nm CMOS process. The experiments results show that transmitter deliver 48-Mbps data rate with output power 20 dBm. The EVM of 64-QAM modulation is lower than 12 % and the total power consumption 360mW under a 1.2-V supply voltage.
Subjects
相位反調
變壓器型功率結合器
D-1功率放大器
Type
thesis
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