A Technique for Enhancing Varactor's Quality Factor in Millimeter-Wave Frequencies

被引：5

作者：

Ghorbani-Nejad, Aboozar ^{[1
]}

Nabavi, Abdolreza ^{[1
]}

机构：

[1] Tarbiat Modares Univ, Fac Elect & Comp Engn, Tehran 14115111, Iran

来源：

IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS II-EXPRESS BRIEFS | 2017年 / 64卷 / 08期

关键词：

CMOS; metal-insulator-metal capacitor (MIMCAP); millimeter wave; oscillator; quality factor (Q-factor) improvement; varactor; MOS VARACTORS; CMOS; OSCILLATOR; DESIGN; VCO;

D O I：

10.1109/TCSII.2016.2611521

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：

Varactors are key devices in the design of voltage-controlled oscillators (VCOs), as their quality factor (Q-factor) at the millimeter-wave frequency range limits the overall LC tank Q-factor. This brief presents a new circuit-level structure, called Q-enhanced varactor (QEV), that is composed of two metal-insulator-metal capacitors (MIMCAPs) and a varactor. Depending on Q-factors and the values of the MIMCAPs, the Q-factor in QEV can be improved more than two times. The QEV parameters are analyzed and a design procedure for QEV is proposed. Also, a QEV with two times Q-factor improvement is employed in the design of a 40-GHz LC-VCO, illustrating more than 6-dB enhancement in the oscillator figure of merit.

引用

页码：872 / 876

页数：5

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