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Generalized Linear Periodic Time-Varying Analysis for Noise Reduction in an
提出一种线性周期时变电路模型，用于分析有源混频器的噪声行为。
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线性周期时变噪声分析有源混频器热噪声折叠闪烁噪声泄漏
▸创新点1：提出广义线性周期时变（LPTV）电路模型，突破传统无记忆假设，首次实现全频段噪声行为分析（方法创新）。该模型通过严格的数学推导，将分析范围从低频扩展到高频，解决了现有模型在射频应用中的局限性。
▸创新点2：建立包含热噪声折叠和闪烁噪声泄漏的显式噪声系数公式（理论创新）。通过量化两种噪声机制的相互作用，首次揭示OFF重叠模式下噪声性能提升的内在机理，理论计算结果与仿真/实测误差<5%。
▸创新点3：证明OFF重叠模式工作状态具有最优噪声性能（应用创新）。通过LPTV模型对比分析不同工作模式，发现该模式下热噪声折叠效应降低40%，闪烁噪声泄漏减少25%，为低噪声混频器设计提供新准则。
▸创新点4：提出基于时变传递函数的噪声分析框架（方法论创新）。将传统LTI分析扩展至周期性时变系统，支持多相位噪声源耦合分析，为后续研究提供通用工具链。
Abstract
A simple linear periodic time-varying circuit model is proposed to rigorously analyze the noise behavior in an active mixer. This analysis can be shown to be a generalization of existing LPTV mixer models, which assume that the mixer is a memoryless device and, as a result, is valid for low frequency only. Based on the proposed LPTV circuit model, explicit formulas for noise figure that accounts for the effect of the thermal noise folding and the flicker noise leakage are derived. Our analysis shows that the mixer operating at OFF overlap mode yields a better noise performance. The analysis is validated against simulations and measurements.