A differentially-tuned voltage controlled oscillator using symmetric transformer

被引：6

作者：

Yun, Seok-Ju ^{[1
]}

Yen, Nguyen D. B. ^{[1
]}

Lee, InYoung ^{[1
]}

Lee, Jin-Taek ^{[2
]}

Lee, Sang-Gug ^{[1
]}

机构：

[1] Informat & Commun Univ, Taejon 305732, South Korea

[2] Mobilepalm Inc, Songnam 463825, South Korea

来源：

IEEE MICROWAVE AND WIRELESS COMPONENTS LETTERS | 2008年 / 18卷 / 07期

关键词：

differentially-tuned; phase noise; voltage controlled oscillator (VCO);

D O I：

10.1109/LMWC.2008.925108

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 letter proposes a new voltage controlled oscillator (VCO) topology that cancels common-mode noise by adoption of differential tuning varactor. To suppress common mode noise effectively, a symmetric three-coil transformer is proposed as a differential tuning resonator. The measured phase noise shows - 128.7 dBc/Hz at 1 MHz offset frequency from the 1.2 GHz oscillation frequency. Over the whole frequency range, common-mode noise rejection is larger than 36 dB. Measured tuning range of the proposed VCO is about 204 MHz from the 1.18 GHz to 1.38 GHz while dissipating 1.2 mA at 1.8 V power supply.

引用

页码：464 / 466

页数：3

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