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Analysis and design of injection-locked LC dividers for quadrature generation

机译:用于正交生成的注入锁定LC分频器的分析和设计

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Injection-locked LC dividers for low-power quadrature generation are discussed in this paper. Modeling the circuits as regenerative frequency dividers leads to very simple analytical expressions for the locking band, phase deviation from quadrature and phase noise. Maximizing the ratio between the injected and the biasing current is beneficial to all the above parameters whereas reducing the tank quality factor improves locking band and quadrature accuracy, though at the expense of current consumption, for given output amplitude. To validate the theory, experiments have been carried on a 0.18-Μm CMOS direct conversion IC, embedding an injection-locked quadrature generator, realized for the Universal Mobile Telecommunication System. Frequency locking range as large as 24% and phase deviation from quadrature around 0.8° are measured while each divider consumes 2 mA. The phase noise of the quadrature generator is determined by the driving oscillator phase noise because the dividers contribution is easily made negligible up to hundreds of megahertz offset.
机译:本文讨论了用于低功耗正交生成的注入锁定LC分频器。将电路建模为再生分频器可以得出非常简单的锁定带,正交相位偏移和相位噪声的解析表达式。使注入电流和偏置电流之间的比率最大化对上述所有参数都是有益的,而降低储罐品质因数可改善锁定带和正交精度,尽管在给定输出幅度下会消耗电流。为了验证该理论,已经在嵌入了注入锁定正交发生器的0.18μmCMOS直接转换IC上进行了实验,这是为通用移动电信系统实现的。当每个分频器消耗2 mA的电流时,测得的锁频范围高达24%,正交相位偏移约为0.8°。正交发生器的相位噪声由驱动振荡器的相位噪声确定,因为在高达数百兆赫兹偏移量的情况下,很容易忽略分频器的影响。

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