← 返回 JSSC 论文列表
📄 下载 JSSC 原文 PDF
JSSC 2023第9期Power Management28nmPLLClock Generation

A Novel LO Phase-Shifting System Based on Digital Bang-Bang PLLs With Background

一种基于数字Bang-Bang PLL的新型LO移相系统,具有高精度和低功耗特性。
28nm CMOS, 20mW功耗, 0.7毫度分辨率, 0.76° rms相位精度
LO移相系统数字Bang-Bang PLL相位调制DTC非线性CMOS
创新点1:采用直接相位调制方法在频率合成器内实现线性移相,无需校准即可达到0.76°的RMS相位精度和2.1°的峰峰值相位误差,解决了传统DTC非线性导致的移相失真问题(系统创新)
创新点2:提出数字相位偏移校正技术,通过消除时序偏差简化了参考时钟分配和DTC匹配需求,显著降低系统复杂度(方法创新)
创新点3:双核PLL同步架构设计,通过共享参考时钟驱动16调制器实现核心间同步,在28nm CMOS工艺下实现0.23mm²/核的面积效率和20mW/核的功耗(电路创新)
创新点4:实现8.5-10GHz范围内19位分辨率(0.7毫度)的360°连续移相能力,同时保持-58.7dBc带内分数杂散和-70dBc参考杂散的高频谱纯度(性能创新)
Abstract
An LO phase-shifting system based on digi- tal fractional-N bang-bang phase-locked loops (PLLs) in the 8.5–10.0-GHz range is presented. A direct phase modulation method is leveraged to perform LO phase-shifting directly within the frequency synthesizer, leading to an inherently linear phase-shifting characteristic, even in the presence of digital-to- time converter (DTC) nonlinearities. Synchronization between fractional-N PLL cores is achieved by clocking with the same reference clock the 16 mo