设计了一种应用于电力线窄带载波通信发送端中的高线性度、全差分的线驱动器。该结构上包括增益可调的预放大级和功率输出级。其中预放大级的输出摆幅可调，功率输出级的静态功耗可调，可针对系统输出功耗检测电路检测到的功耗输出信息选择相应的静态功耗。电路基于中芯国际(SMIC)的0.18 μm互补金属氧化物半导体(CMOS)工艺设计。后仿真结果表明，在输出摆幅峰峰值为4 V的情况下，最大电流驱动能力可达667 mA，总谐波失真(THD)小于-60 dB，符合电力线窄带载波通信的应用要求。

A fully differential line driver, with high linearity is presented，which is applied in narrowband Power Line Carrier Communication(PLCC). The proposed configuration includes a preamplifier with programmable gain and a power output stage. The preamplifier features an adjustable output swing, and the static power consumption can be switched by output stage according to power detection circuit. The proposed line driver is deigned based on Semiconductor Manufacturing International Corporation(SMIC) 180 nm Complementary Metal Oxide Semiconductor(CMOS) technology. Post-layout simulated results show that the maximum current driving capacity is up to 660 mA and the Total Harmonic Distortion(THD) is less than -60 dB when peak-to-peak value of output swing is 4 V, which meets the requirement of narrowband power line carrier communication.