A U-band phase-locked loop (PLL) with implicit distributed resonators in the voltage-controlled oscillator (VCO) and injection-locked frequency divider (ILFD) using 40 nm CMOS is investigated in this brief. While LC-based, transformer-based, and distributed resonators are typically adopted for mm-wave and sub-terahertz applications, implicit distributed resonators are proposed to enhance the oscillation frequency of the VCO and expand the locking range of the ILFD. The operating principles and the characteristics of the proposed implicit distributed resonators are discussed for intuitive insight. The presented PLL occupies 0.53 mm2 core area and has 81.8 mW power consumption. The PLL achieves a measured frequency range of 8.15 GHz (16%) from 46.75 GHz to 54.9 GHz. The measured phase noise is −91.8 dBc/Hz at 1 MHz offset frequency from a carrier of 46.75 GHz. The proposed U-band PLL can provide a clear and stable local oscillation signal for the transceivers operating at mm-wave and sub-terahertz (sub-THz) frequency band.

中文翻译：

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使用隐式分布式谐振器的 U 波段 PLL 用于 40 nm CMOS 亚太赫兹无线收发器

本简介中研究了在压控振荡器 (VCO) 和注入锁定分频器 (ILFD) 中具有隐式分布式谐振器的 U 波段锁相环 (PLL)，该锁相环 (PLL) 使用 40 nm CMOS。虽然基于 LC、基于变压器和分布式谐振器通常用于毫米波和亚太赫兹应用，但建议隐式分布式谐振器来提高 VCO 的振荡频率并扩大 ILFD 的锁定范围。讨论了所提出的隐式分布式谐振器的工作原理和特性，以获得直观的洞察力。所提出的 PLL 占用 0.53 mm2 核心面积，功耗为 81.8 mW。PLL 实现了从 46.75 GHz 到 54.9 GHz 的 8.15 GHz (16%) 的测量频率范围。测得的相位噪声为-91。8 dBc/Hz 在 1 MHz 偏移频率时从 46.75 GHz 的载波。所提出的 U 波段 PLL 可以为在毫米波和亚太赫兹 (sub-THz) 频段工作的收发器提供清晰稳定的本地振荡信号。