GHz 0.18μm SiGe BiCMOS Exact-Frequency Fractional-N Frequency Synthesizer with Spurious-Tone Suppression Yielding a -80dBc In-Band Fractional Spur

📋 论文概要

本文提出了一款基于0.18μm SiGe BiCMOS工艺的精确频率分数-N频率合成器，通过创新的杂散抑制技术实现了-80dBc的杂散性能，解决了传统分数-N PLL中由于数字ΔΣ调制器引入的分数杂散问题。

💡 主要创新点

• 提出精确频率分数-N合成架构，避免量化误差导致的频率偏移。
• 采用新型杂散抑制技术，将杂散电平压低至-80dBc以下。
• 在0.18μm SiGe BiCMOS工艺上实现GHz级工作频率，兼具高性能与低功耗。

🏷 关键词

📄 原文摘要

Stefano Tulisi4, Sanganagouda Patil4, Ciarán Curtin4, Stephen Brookes4, Brian Shelly4, Patrick Griffin4, Michael Keaveney4 University College Dublin, Dublin, Ireland Microelectronic Circuits Centre Ireland, Dublin, Ireland 3 Microelectronic Circuits Centre Ireland, Cork, Ireland 4 Analog Devices, Limerick, Ireland 1 2 The instantaneous divide value of the multimodulus divider in the feedback path of a fractional-N PLL is determined by a divider controller, which is usually implemented as a digital delta-sigma modulator (DΔΣM). A disadvantage of the fractional-N PLL is the presence of fractional spurs, which result from interaction between the signal introduced by the DΔΣM and nonlinearities in the loop. When fractional spurs at frequencies close to integer boundaries lie inside the loop bandwidth, they cannot be attenuated by filtering. The Successive Requantizer (SR) is an alternative to the DΔΣM-based divider controller, which randomizes

👥 作者与机构

Michael Peter Kennedy1,2, Yann Donnelly1,3, James Breslin4,