This paper presents a novel design of 2.4-GHz variable-gain active predistorter (PD) using a 0.35-μm SiGe BiCMOS technology. The current steering topologies are selected for this design to provide dual functions of (1) an active predistorter for power amplifier linearization, and (2) a variable gain amplifier (VGA) for transmitter power control. Unlike other traditional "passive" predistorters, this active predistorter does not need an additional buffer amplifier to compensate the loss. Furthermore, through the bias voltage control at low current region, the amount of gain expansion from this predistorter becomes programmable to compensate the PA non-linearity. Finally, this variable-gain predistorter could be used as a VGA in a multi-stage power amplifier design and it is well suitable for the RF-SOC applications. The PA experimental results of 16-QAM modulated signals show that the compressed constellation can be uniformly spread out into a "square", the spectral re-growth is suppressed by 7-9 dB, and the EVM can be reduced from 9.9 % to 5.7 %.
|出版狀態||已發佈 - 2004 九月 20|
|事件||Digest of Papers - 2004 IEEE Radio Frequency Integrated Circuits (RFIC) Symposium - Fort Worth, TX, 美国|
持續時間: 2004 六月 6 → 2004 六月 8
|其他||Digest of Papers - 2004 IEEE Radio Frequency Integrated Circuits (RFIC) Symposium|
|城市||Fort Worth, TX|
|期間||04/6/6 → 04/6/8|
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