A 1.8-GHz LC VCO with 1.3-GHz tuning range and digital amplitude calibration
A 1.8-GHz LC VCO with 1.3-GHz tuning range and digital amplitude calibration
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DOI：
10.1109/jssc.2004.842851
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发表时间：
2005-04
影响因子：
5.4
通讯作者：
A. Berny;A. Niknejad;R. Meyer
中科院分区：
文献类型：
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作者：
A. Berny;A. Niknejad;R. Meyer
采用 0.18-/spl mu/m CMOS 工艺设计的 1.8GHz LC VCO 可实现 73% 的极宽调谐范围，在距 1.8GHz 载波 600kHz 偏移时测得的相位噪声为 -123.5dBc/Hz，同时从 1.5V 电源汲取 3.2mA 电流。讨论了宽带操作对启动约束和相位噪声的影响。根据基本无量纲设计参数分析调谐范围，产生有用的设计方程。幅度校准技术用于稳定整个宽带操作的性能。这种幅度控制方案不仅消耗的功率和面积可以忽略不计，而且不会降低相位噪声，而且被证明有助于维持频率范围高端的 VCO 性能。
A 1.8-GHz LC VCO designed in a 0.18-/spl mu/m CMOS process achieves a very wide tuning range of 73% and measured phase noise of -123.5 dBc/Hz at a 600-kHz offset from a 1.8-GHz carrier while drawing 3.2 mA from a 1.5-V supply. The impacts of wideband operation on start-up constraints and phase noise are discussed. Tuning range is analyzed in terms of fundamental dimensionless design parameters yielding useful design equations. An amplitude calibration technique is used to stabilize performance across the wide band of operation. This amplitude control scheme not only consumes negligible power and area without degrading the phase noise, but also proves to be instrumental in sustaining the VCO performance in the upper end of the frequency range.