A Low Power Wide-band Voltage Controlled Oscillator for Global Navigation Satellite System Receiver
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摘要: 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0.24 mm2。提出的VCO在0.13 m 1P6M工艺上实现，已成功应用于全波段GNSS接收机中。
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关键词:
- 全球导航卫星系统(GNSS) /
- 压控振荡器(VCO) /
- 离散工作区域 /
- 调谐曲线线性化 /
- 滤波
Abstract: 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 m 1P6M process, and it is successfully applied to all-band GNSS receiver. -
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