Ultra-Low Power Direct-Conversion 16 QAM Transmitter Based on Doherty Power Amplifier
Ultra-Low Power Direct-Conversion 16 QAM Transmitter Based on Doherty Power Amplifier
复制标题
基于Doherty功率放大器的超低功耗直接变频16 QAM发射机
DOI：
10.1109/lmwc.2016.2574826
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发表时间：
2016
影响因子：
3
通讯作者：
Bumman Kim
中科院分区：
文献类型：
--
作者：
Daechul Jeong;Seokwon Lee;Hankyu Lee;Bumman Kim
这封信介绍了一个完全集成的超低功率（ULP）直接转换发射机。对于ULP调制，电压驱动的无源混频器采用具有低输出阻抗的超级源从动器（SSF）进行优化。此外，还提出了一种线性Doherty PA，以获得良好的退退效率。在传输PAPR为7.5 dB的16 qam信号时，Doherty PA的效率为14%，ACLR为-30.1 dBc， EVM为5.8%，平均输出功率为-7.66 dBm。基带缓冲器和包含无重叠4相时钟发生器的混频器的功耗分别为0.59和0.51 mW，发射链的实测功耗为2.59 mW。发射器采用28纳米CMOS工艺实现，占用0.525 mm2的有效面积。
This letter presents a fully-integrated umW,ltra-low power (ULP) direct-conversion transmitter. For an ULP modulation, a voltage-driven passive-mixer is optimized with a super source follower (SSF) having a low-output impedance. Also, a linear Doherty PA is proposed for a good back-off efficiency. For transmitting a 16-QAM signal with PAPR of 7.5 dB, the efficiency of the Doherty PA is 14% with the ACLR of -30.1 dBc and the EVM of 5.8% at the average output power of -7.66 dBm. The baseband buffer and the mixer including the non-overlapping 4-phase clock generator consumes 0.59 and 0.51 mW, respectively, and the measured power consumption of the transmitter chain is 2.59 mW. The transmitter is implemented using 28 nm CMOS process and occupies an active area of 0.525 mm2.