摘要
文章采用集成压控振荡器的锁相环芯片LMX2531设计了一种用于射频读写器的频率源,利用小数分频技术克服了整数分频锁相环所固有的高频率分辨率与相位噪声的矛盾,利用单片机对LMX2531Q1312E进行逻辑控制。该频率源可实现1 268~1 360 MHz频率范围内任意频点的合成。该信号源具有优良的相位噪声和杂散抑制,具有调试工作量小、一致性好等优点。
A frequency source is designed for radio frequency （RF） reader, utilizing PLL chip LMX2531Q1312E integrated with a voltage controlled oscillator （VCO）. Using sigma-delta fractional-N PLL technology, this frequency source solves the rooted contradiction between high frequency resolution and low phase noise and uses microcontroller to conduct logistic control on LMX2531Q1312E. By the control of the micro-controller, the frequency source can generate any frequency range from 1 268 Hz to 1 360 MHz. The measurement results show that the frequency source has excellent phase noise, spurious suppression, and it needs less debugging work and is of good consistency.
出处
《江苏科技信息》
2017年第9期46-48,共3页
Jiangsu Science and Technology Information
关键词
锁相环
频率源
相位噪声
压控振荡器
射频读写器
phase locked loop （PLL）
frequency source
phase noise
voltage controlled oscillator （VCO）
radio frequency （RF） reader
