A 0.55mW Fractional-N PLL with a DC-DC Powered Class-D VCO Achieving Better than-66dBc Fractional and Reference Spurs for NB-IoT

被引：0

作者：

Kooshkaki, Hossein Rahmanian ^{[1
]}

Mercier, Patrick P. ^{[1
]}

机构：

[1] Univ Calif San Diego, La Jolla, CA 92093 USA

来源：

2020 IEEE CUSTOM INTEGRATED CIRCUITS CONFERENCE (CICC) | 2020年

关键词：

PLL; fractional-N; low-power; single-supply; class-D; spur; narrowband IoT;

D O I：

暂无

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

This paper presents a sub-mW single supply fractional-NPLL for Narrowband IoT (NB-IoT) applications. The analog PLL meets the relatively strict spur requirement of NB-IoT while using a low power class-D oscillator with a resistive header, which improves phase noise by 3dB and reduces power consumption by 25% with negligible area overhead. The VCO, working at 729-960MHz, is powered by an on-chip DC-DC converter with 90% efficiency designed in a manner to not degrade the spur performance of the PLL, which is measured to be -67.5dBc for reference and -66.3dBc for fractional spurs.

引用

页数：4