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High linearity and low noise CMOS mixer and signal mixing method

机译:高线性度低噪声CMOS混合器及信号混合方法

摘要

Method and apparatus are provided for high linearity and low noise communication signal mixing. The apparatus includes a high linearity low noise mixer having an input stage coupled to a switch stage by a series-coupled blocking capacitance and input resistance. The input stage includes a buffer with negative feedback, and the switch stage includes a transistor based switch network connected to an amplifier that has feedback resistance and shunting capacitance. The method includes AC coupling an RF signal, increasing a gain of the RF signal, reducing third-order distortion by negatively feeding-back the RF signal, blocking IM2 generated from said gain increasing step, increasing a second-order input intercept point (IIP2) by attenuating the RF signal across a resistance, and applying a local oscillator input to the RF signal.
机译:提供了用于高线性度和低噪声通信信号混合的方法和装置。该设备包括高线性度低噪声混频器,其具有通过串联耦合的阻断电容和输入电阻耦合到开关级的输入级。输入级包括具有负反馈的缓冲器,开关级包括基于晶体管的开关网络,该网络连接到具有反馈电阻和并联电容的放大器。该方法包括AC耦合RF信号,增加RF信号的增益,通过负反馈RF信号来减少三阶失真,阻止从所述增益增加步骤产生的IM2,增加二阶输入截取点(IIP2)。 ),方法是在整个电阻上衰减RF信号,然后将本地振荡器输入应用于RF信号。

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