Class-C VCO With Amplitude Feedback Loop for Robust Start-Up and Enhanced Oscillation Swing

被引：89
作者：
Deng, Wei [1 ]
Okada, Kenichi [1 ]
Matsuzawa, Akira [1 ]
机构：
[1] Tokyo Inst Technol, Dept Phys Elect, Tokyo 1528552, Japan
来源：
IEEE JOURNAL OF SOLID-STATE CIRCUITS | 2013年 / 48卷 / 02期
关键词：
Class-C; CMOS; feedback; PVT; start-up; VCO; LOW-PHASE-NOISE; CMOS VCOS; COLPITTS; PERFORMANCE; DESIGN;
D O I：
10.1109/JSSC.2012.2227603
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：
We propose a feedback class-C voltage-controlled oscillator (VCO) that has robust start-up and a large oscillation amplitude. It initially starts oscillating as a conventional cross-coupled LC-VCO for robust start-up and subsequently transforms automatically into an amplitude-enhanced class-C VCO when it reaches steady-state to give improved noise performance. Detailed analysis of the start-up conditions, enhanced oscillation swing, and amplitude stability provides valuable insight into oscillator design considerations. The proposed VCO is implemented in a 0.18-mu m CMOS process. The measured phase noise at room temperature is -125 dBc/Hz at 1 MHz offset with a power dissipation of 3.4 mW at an oscillation frequency of 4.84 GHz. The figure-of-merit is -193 dBc/Hz.
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收藏
页码：429 / 440
页数：12
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