一种应用于高速锁相环的宽锁定范围注入锁定分频器

A wide locking range injection-locked frequency divider for high-speed phase-locked loop

针对传统的注入锁定分频器锁定范围较窄的问题,提出了一种用于毫米波锁相环的注入锁定分频器。基于55 nm CMOS工艺,设计了一种宽锁定范围的二分频注入锁定分频器。提出分布式差分注入的方式,增强注入电流与注入效率,采用高阶变压器作为谐振腔,在不使用调谐机制的条件下,有效增大了分频器的锁定范围。此外,还对传统buffer的结构进行改进,增强谐波抑制能力,保持了较宽的锁定范围。电路仿真结果表明,提出的分频器电路在0 dBm注入功率下可在22.8~36.3 GHz频段内完成二分频功能,达到45.7%的锁定范围,电路的功耗为3.54 mW(不含buffer)。

A 30 GHz wide locking range injection-locked frequency divider based on 55 nm CMOS process for millimeter-wave phase-locked loop was proposed to overcome the problem of narrow locking range of traditional injection-locked frequency dividers.Distributed direct injection and high-order transformer resonator were applied to the frequency divider to increase the injection current and injection efficiency,thus achieving wide locking range without tuning mechanisms.Harmonic suppression technique was also adopted to the output buffer to improve the locking range with no penalty in power consumption.The post simulation results show that the locking range of the proposed frequency divider was 22.8-36.3 GHz(45.7%)at the injection power of 0 dBm and the power dissipation of core circuit was 3.54 mW.