适用于多种无线通信标准的宽带CMOS频率综合器

采用小数分频锁相环路、正交单边带混频器和除2除法器设计了一款全集成CMOS频率综合器,以满足多种无线通信标准的要求.提出基于双模压控振荡器（DMVCO）的频率综合器架构,一方面能够通过除2除法器覆盖3GHz以下的无线通信频段,另一方面DMVCO自身又替代了额外的多相滤波器来抑制混频器引入的镜像杂散.频率自动校准电路能对压控振荡器的频率进行快速、准确的校准.频率综合器采用TSMC 0.13μmCMOS工艺进行设计.仿真结果表明,在输出频率为900MHz时频偏在0.6MHz处,频率综合器的相位噪声为-122dBc/Hz;在功耗不大于56mW的情况下,频率综合器实现了0.4～6GHz的频率覆盖范围.

A CMOS Frequency Synthesizer for Multi-standard Wireless Communications

To fulfill the requirements of the multi-standard wireless communications,a CMOS frequency synthesizer is proposed,based on a fractional-N PLL,a quadrature sigle-sideband mixer and divide-by-2 dividers.The proposed synthesizer architecture based on a Dual-Mode VCO can cover the entire frequency band below 3GHz and avoid the usage of the additional poly-phase filter.Automatic frequency calibration circuit is integrated with the synthesizer to guarantee fast and accurate PLL settling.The circuit is implemented in TSMC 0.13 μm CMOS process.Simulated phase noise is-127 dBc/Hz at 1.6 MHz offset from a 1.8GHz carrier.The synthesizer achieves a continuous 0.4~6GHz tuning range with less than 56 mW power.