A 6.8-14.4GHz Calibration-Free Fractional-N RO-Based Harmonic-Mixing Frequency Synthesizer Achieving −80.7dBc Fractional Spur

IF 4.9 2区工程技术 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC

IEEE Transactions on Circuits and Systems II: Express Briefs Pub Date : 2025-07-30 DOI:10.1109/TCSII.2025.3594027

Zonglin Ye;Hongyang Zhang;Yuxuan Sun;Xinlin Geng;Qian Xie;Shiheng Yang;Zheng Wang

引用次数: 0

Abstract

A calibration-free fractional-N synthesizer is presented with octave tuning capability and low fractional spurs, which is fabricated using a 65-nm bulk CMOS process. The synthesizer is based on the harmonic-mixing (HM) architecture, featuring a unity gain for the quantization error transfer to achieve low fractional spur without any calibration. To support octave-tuning, a ring-oscilator(RO)-based first stage is utilized to save area with negligible jitter deterioration. Moreover, a variable sub-sampling ratio technique is employed to relax the tuning range requirement for the RO. The measurements demonstrate an octave-tuning synthesizer with −80.7 dBc fractional spur, 71.7% tuning range and −254.6 dB FoMT.

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一种6.8-14.4GHz免校准分数阶n- ro混频合成器，实现−80.7dBc分数阶杂散

提出了一种采用65nm块体CMOS工艺制作的具有八度程调谐能力和低分数杂散的免校准分数n合成器。该合成器基于谐波混合（HM）结构，具有单位增益的量化误差传递，无需任何校准即可实现低分数杂散。为了支持八度调谐，利用环振荡器（RO）的第一级来节省抖动退化可忽略不计的面积。此外，采用可变子采样比技术放宽了对RO的调谐范围要求。测量结果表明，八度调谐合成器具有−80.7 dBc的分数杂散，71.7%的调谐范围和−254.6 dB的fmt。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

IEEE Transactions on Circuits and Systems II: Express Briefs 工程技术-工程：电子与电气

CiteScore

7.90

自引率

20.50%

发文量

883

审稿时长

3.0 months

期刊介绍： TCAS II publishes brief papers in the field specified by the theory, analysis, design, and practical implementations of circuits, and the application of circuit techniques to systems and to signal processing. Included is the whole spectrum from basic scientific theory to industrial applications. The field of interest covered includes: Circuits: Analog, Digital and Mixed Signal Circuits and Systems Nonlinear Circuits and Systems, Integrated Sensors, MEMS and Systems on Chip, Nanoscale Circuits and Systems, Optoelectronic Circuits and Systems, Power Electronics and Systems Software for Analog-and-Logic Circuits and Systems Control aspects of Circuits and Systems.