一种新型的采用电流转向电荷泵的快速锁定小数分频锁相环

A new fast-locking fractional frequency division phase-locked loop using current steering charge pump

基于SMIC 0.13μm工艺设计了一款工作电压为1.5 V的模拟整数分频锁相环(Phase Locked Loop,PLL),提出了一种能有效解决电荷分流、提高开关速度的新型电流转向电荷泵,同时基于环形差分反相器设计了具有低相位噪声特点的压控振荡器。在整数分频锁相环基础上,加入MASH3结构的数字Σ-Δ调制器(Delta Sigma Modulation,DSM)实现了一种数模混合的快速锁定小数分频锁相环,能在输入参考频率为26 MHz下输出频率范围0.8 GHz^2.0 GHz,具有低噪声、低频率步进和快速锁定等优点。

Based on the SMIC 0. 13 μm process, an analog integer frequency PLL with 1. 5 V working voltage is designed, and a new type of current steering charge pump that can effectively solve the charge shunt and improve the switching speed is proposed.At the same time, a voltage controlled oscillator with low phase noise is designed based on the ring differential inverter. On the basis of the integer frequency-division PLL, the digital DSM with MASH3 structure is added to realize a digital-analog mixed fast-locked decimal frequency-division phase-locked loop, which can be the output frequency range from 0. 8 GHz to 2. 0 GHz at 26 MHz,and has the advantages of low noise, low frequency stepping, and fast lock.