压控振荡器
dBc公司
相位噪声
电气工程
偏移量(计算机科学)
电压
振幅
自动增益控制
电子工程
材料科学
工程类
计算机科学
物理
CMOS芯片
放大器
量子力学
程序设计语言
作者
J. Rogers,D.G. Rahn,C. Plett
出处
期刊:IEEE Journal of Solid-state Circuits
[Institute of Electrical and Electronics Engineers]
日期:2003-02-01
卷期号:38 (2): 352-356
被引量:51
标识
DOI:10.1109/jssc.2002.807401
摘要
This paper presents both analog and digital automatic-amplitude control techniques for voltage-controlled oscillators (VCOs). These feedback mechanisms help to keep the VCOs at an optimum amplitude over temperature, process, and voltage variations. The VCOs were fabricated in a 50-GHz SiGe BiCMOS process. They use MOS varactors and achieve a 600-MHz tuning range in the 2-GHz band. The phase noise of the VCO with analog control was measured to be -99 dBc/Hz at 100-kHz offset from the carrier. The digital loop allows for a more optimized VCO core that achieves a phase noise of -108.5 dBc/Hz at 100-kHz offset in a low-gain mode. Techniques for suppressing the phase noise in regions of high gain are also presented. The VCOs draw between 4 and 8 mA from a 3.3-V supply.
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