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基于0.18μm CMOS工艺设计了一款适用于中国超宽带(UWB)标准的发射机前端。该发射机前端通过在片内集成有源巴仑,实现了信号先差分至单端转化、后信号放大的策略,不仅提高了系统集成度而且有利于降低系统功耗。同时,提出折叠PMOS跨导技术使混频器的线性度得以提升,利于增大发射链路中低频放大器的增益比重以减轻高频放大器的压力。最终,对前端电路应用并联峰化技术,满足了系统对带宽的要求。芯片采用COB(chip on board)方式测试,结果表明:射频输出端口在5～11.5 GHz内匹配良好,系统的IP-1dB约为-2 dBm。芯片面积为0.8 mm×1.1 mm,工作电压1.8 V时消耗电流20.4 mA。为中国超宽带(UWB)标准的进一步研究提供了参考。
A 0.18μm CMOS process is designed for a transmitter front end suitable for China’s UWB standard. The front end of the transmitter integrates the active balun in the chip to realize the strategy that the signals are first differentiated to single-ended conversion and amplified after the signal, which not only improves the system integration but also reduces the system power consumption. At the same time, folded PMOS transconductance technology is proposed to improve the linearity of the mixer, and to increase the gain proportion of the low-frequency amplifier in the transmission link so as to reduce the pressure of the high-frequency amplifier. Finally, the application of parallel peak peaking circuit technology to meet the bandwidth requirements of the system. The chip is tested on chip on board (COB). The results show that the RF output ports are well matched in 5 ~ 11.5 GHz and the system IP-1dB is about -2 dBm. The chip area is 0.8 mm × 1.1 mm, and consumes 20.4 mA when the operating voltage is 1.8 V. It provides a reference for the further research of UWB standard in China.