摘 要:为解决由NB-IoT 高均峰比调制信号引起功率回退,进而导致功率放大器效率变低的问题,文章采用40 nm1P6M CMOS 工艺设计,研究了一款适用于NB-IoT 极性调制发射机的混合电源调制电路。芯片测试结果表明,当发射机的输出功率为23.48 dBm 时,采用此电路的极性调制发射机的效率可以提升12.0%,测量的发射机EVM(误差矢量幅度)为6.9%,占用带宽为175.22 kHz,整体性能均满足3GPP 测试规范要求。
关键词:混合电源调制器;CLASS-AB 放大器;CLASS-D 放大器;极性调制发射机
中图分类号:TN752 文献标识码:A 文章编号:2096-4706(2020)24-0060-04
A Hybrid Power Supply Modulation Circuit Based on NB-IoT Transmitter
LIANG Zhen,SHI Lei,XU Ken,DENG Jinli,LIN Shuming
(Guangzhou Letswin Microelectronics Co.,Ltd.,Guangzhou 510663,China)
Abstract:In order to solve the problem of power back-off caused by high PAPR modulation signal of NB-IoT,further lead to the low efficiency of power amplifier,a hybrid power supply modulation circuit for NB-IoT polar modulation transmitter is designed by means of using 40 nm 1P6m CMOS process planning. The chip test results show that when the output power of transmitter is 23.48 dBm,the efficiency of the polar modulation transmitter using this circuit can be improved by 12.0%,the measured transmitter EVM(error vector magnitude)is 6.9%,and the occupied bandwidth is 175.22 kHz. The overall performance meets the requirements of 3GPP test specification.
Keywords:hybrid power supply modulator;CLASS-AB amplifier;CLASS-D amplifier;polar modulation transmitter
基金项目:广东省重点领域研发计划项目(2019B010142002)
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作者简介:梁振(1979—),男,汉族,山东泰安人,工程师,博士,研究方向:射频集成电路设计。