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本文提出一种具有数字辅助IIP2背景自校准的低功耗低噪声直接转换前端，用于解决WCDMA等全双工标准中发射信号泄漏导致的IIP2退化问题。该设计在制造和运行条件变化下自动校准IIP2，无需牺牲面积、功耗或性能。
Columbia University, New York, NY Toshiba, Kawasaki, Japan 2 Direct conversion receivers offer a high level of integration for multiband applications. For standards operating in full duplex, like WCDMA, a very high IIP2 is needed due to transmit signal leakage. Several circuit, compensation and calibration techniques to improve the IIP2 have been developed, but they usually result in a trade-off between IIP2, area, power and other specifications [1,2]. The IIP2 is very sensitive to manufacturing variations and operating conditions such as supply voltage, LO power or frequency, and temperature. We present a robust automatic background self-calibration technique with minimal overhead and performance penalties on the receiver front-end or baseband due to its digital implementation (Fig. 3.8.1). Such digital IIP2 calibration is also free of mismatch. The 0.13µm 1.8GHz CMOS RF front-end without external filter between
Yiping Feng1, Gaku Takemura2, Shunji Kawaguchi2, Nobuyuki Itoh2, Peter Kinget1