Noise and Nonlinearity Modeling of Active Mixers for Fast and Accurate Estimation
Noise and Nonlinearity Modeling of Active Mixers for Fast and Accurate Estimation
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DOI：
10.1109/tcsi.2010.2072110
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发表时间：
2011-02-01
影响因子：
5.1
通讯作者：
Nauta, Bram
中科院分区：
文献类型：
--
作者：
Cheng, Wei;Annema, Anne Johan;Nauta, Bram
本文提出了一种有源混频器模型，用于快速准确地估计噪声和非线性。基于封闭形式的表达式，该模型通过有限数量的时不变电路计算来估计时变混频器的噪声系数、IIP3和IIP2。该模型表明，晶体管输出电阻的降低，以及深亚微米技术中的低电源电压，显着地有助于闪烁噪声泄漏。低闪烁噪声的设计见解，然后提出。该模型还表明，本振信号的斜率对IIP2有显著影响，而对IIP3影响不大。提出了一种新的基于斜率调谐的IP2校准技术。
This paper presents a model of active mixers for a fast and accurate estimation of noise and nonlinearity. Based on closed-form expressions, this model estimates the noise figure, IIP3, and IIP2 of the time-varying mixer by a limited number of time-invariant circuit calculations. The model shows that the decreasing transistor output resistance, together with the low supply voltage in deep-submicrometer technologies, significantly contributes to the flicker-noise leakage. Design insights for low flicker noise are then presented. The model also shows that the slope of the LO signal has a significant effect on IIP2, while it has a little effect on IIP3. A new IP2 calibration technique using slope tuning is presented.