全球卫星导航系统接收机的正交二分频器设计

Design of quadrature 2∶1 frequency divider for GNSS receivers

将全球卫星导航系统(GNSS)接收机用于手持移动设备必须降低正交二分频器等大功耗模块的功耗,因此,本文提出了工作于1V电压以下的正交二分频器。使用提出的正交二分频器可使电路在各工艺角下高速稳定的工作,并大大降低模块的功耗。首先,介绍已有的高速二分频器。接着,计算了所提出结构的直流静态偏置,并对提出的锁存器进行小信号建模和分析。最后,根据小信号模型分析得到的条件和GNSS接收机的应用要求,设计了提出的低功耗结构。实验结果表明:提出的二分频器最高工作频率为6.55GHz,最低可工作到0.25GHz,消耗电流为0.8mA,占用面积为0.014 4mm2。提出的电路结构在0.13μm CMOS工艺上实现,可稳定工作于1V电压下,目前已成功应用于低功耗的移动GNSS接收机中。

When the Global Navigation Satellite System（GNSS） receivers are applied to a portable handset,the power of the most power-hungry blocks,such as quadrature 2∶1 frequency divider,should be reduced.Therefore,this paper proposes a 1 V low power quadrature 2∶1 frequency divider at high speed and steady working in all process corners.First,the published high speed architectures are introduced.Then the static DC bias is calculated for the proposed architecture,and a small signal model for proposed flip-flop is developed and analyzed.Finally,a low power circuit is designed according to the analysis conditions of small signal model and the application requirements of GNSS receivers.Experimental results indicate that the proposed frequency divider works from 6.55 to 0.25 GHz,its consume current is only 0.8 mA,and the core area is 0.014 4 mm2.The proposed quadrature 2∶1 frequency divider is implemented in a 0.13 μm CMOS process,and can steadily work in a sub 1 V supply voltage.It has been successfully applied to low power portable GNSS receivers.