一种应用于全球导航卫星系统接收机的低功耗宽带压控振荡器

该文设计了一种应用于全球导航卫星系统(GNSS)射频接收芯片的新型低功耗小面积宽频率调节范围的压控振荡器(VCO).根据全波段GNSS信号的特点,将VCO分成两个离散的频率工作区域,可分别对这两个区域进行功耗、相位噪声的优化,减小了VCO结构的复杂度,并节省了芯片面积.利用调谐曲线线性化技术,克服了传统的VCO控制电压有效调节范围窄的问题,使VCO在整个控制电压范围内调节曲线线性,减小了幅度调制转频率调制(AM-FM),降低了相位噪声.测试结果显示,该VCO频率调节范围为49.5％,控制电压在0.1～0.9 V内,VCO增益(KVCO)恒定,当频率偏移为1 MHz时相位噪声小于-120 dBc/Hz,消耗电流2 mA,占用芯片面积为0.24mm2.提出的VCO在0.13 μm 1P6M工艺上实现,已成功应用于全波段GNSS接收机中.

A Low Power Wide-band Voltage Controlled Oscillator for Global Navigation Satellite System Receiver

This paper presents a new low power small area wide-band Voltage Controlled Oscillator(VCO) for Global Navigation Satellite System(GNSS) receiver.The VCO is separated in two discrete working regions from the characteristic of all-band GNSS signals.The power and phase noise can be optimized individually,the complexity of VCO is reduced and the area is saved.A technique of tuning curve linearization is used;The conventional VCO problem of having narrow effective tuning range of control voltage(VCTRL) is solved.A linear tuning curve in whole variation of VCTRL is kept,the Amplitude Modulation to Frequency Modulation(AM-FM) conversion is decreased,and the phase noise is allayed.The measured results show that the tuning range of frequency is 49.5%,the gain of VCO(KVCO) is constant when VCTRL varies from 0.1 to 0.9 V.Measured phase noise is lower than-120 dBc at 1 MHz offset,the entire VCO consumes 2 mA current,occupies 0.24 mm2 area.The proposed VCO is implemented in 0.13 μm 1P6M process,and it is successfully applied to all-band GNSS receiver.