摘要
为了提高导航接收机中本振频率的精度和稳定性,避免本振信号在锁相环电路中发生漂移,锁相环的低噪声、快速锁定等性能是电路设计的关键,而鉴频鉴相器作为锁相环系统的重要模块之一,其鉴相死区的存在,极大地恶化了锁相环的噪声特性。基于中芯国际(SMIC)0.18μm互补金属氧化物半导体(CMOS)工艺,设计了一种复位脉宽可调节的无死区鉴频鉴相器,根据压控振荡器反馈频率信号调节复位脉冲宽度,实现了4种不同的复位延时,在降低抖动的同时,能够有效地消除鉴相死区。当供电电压为1.8 V时,其最大工作频率为530 MHz,最大相位噪声为-142.2 dBc/Hz。电路鉴频鉴相功能正确,并具有良好的频率和噪声特性,可应用到导航接收机中的锁相环电路中。
In order to improve the accuracy and stability of the local oscillator frequency in navigation receivers,to avoid the drift of the local oscillator signal in the phase-locked loop circuit,the paper designed a phase frequency detector:based on China’s Semiconductor Manufacturing International Corp.(SMIC)0.18μm Complementary Metal–Oxide–Semiconductor(CMOS)process,a dead-zone-free phase frequency detector with adjustable reset pulse width was given;and the reset pulse width was adjusted to achieve 4 different reset delay according to the feedback frequency signal of the voltage-controlled oscillator,which could effectively eliminate the phase discrimination dead zone while reducing jitter.Experimental result showed that:when the voltage was 1.8 V,the maximum operating frequency of the detector would be 530 MHz,with the maximum amplitude noise -142.2 dBc/Hz;and the frequency and phase discrimination function of this circuit could be correct with good frequency and noise characteristics,indicating the feasibility of the detector for the phase-locked loop circuit of navigation receivers.
作者
张治国
黄海生
李鑫
党成
ZHANG Zhiguo;HUANG Haisheng;LI Xin;DANG Cheng(School of Electronic Engineering,Xi'an University of Posts and Telecommunications,Xi'an 710121,China)
出处
《导航定位学报》
CSCD
2021年第2期35-40,共6页
Journal of Navigation and Positioning
基金
国家自然科学基金-地区科学基金项目(61661049)。
关键词
导航接收机
锁相环
鉴频鉴相器
死区
低噪声
navigation receiver
phase-locked loop
phase frequency detector
dead zone
low noise
