A Capacitance Boosted Full-Octave LC VCO Based 0.7 to 24 GHz Fractional-N Synthesizer

被引：0

作者：

Sadhu, Bodhisatwa ^{[1
]}

Ferriss, Mark ^{[1
]}

Friedman, Daniel ^{[1
]}

机构：

[1] IBM TJ Watson Res Ctr, Yorktown Hts, NY USA

来源：

PROCEEDINGS OF THE 2015 IEEE RADIO FREQUENCY INTEGRATED CIRCUITS SYMPOSIUM (RFIC 2015) | 2015年

关键词：

VCO; tuning range; varactor; switched capacitor;

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 describes a technique in which a series inductance is used with a varactor to increase the varactor maximum to minimum capacitance ratio, thus enabling increased tuning range in an LC VCO. This technique is demonstrated through the implementation of an LC VCO tunable over a range greater than an octave, specifically 10.5 to 24 GHz (78%). The VCO is implemented within a fractional-N synthesizer in 32nm SOI CMOS to achieve continuous tuning from a fixed reference and achieves -128 to -119 dBc/Hz phase noise at 10MHz offset from the carrier across the tuning range. Output divider circuits are used to obtain all frequencies down to 660MHz.

引用

页码：111 / 114

页数：4