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1. 发明申请

WO2011100539A1 WIDE BAND LNA WITH NOISE CANCELING 审中-公开
标题翻译：宽带上弦与噪音消除
公开(公告)号：WO2011100539A1
公开(公告)日：2011-08-18
申请号：PCT/US2011/024516
申请日：2011-02-11
申请人： QUALCOMM INCORPORATED , ZENG, Yi , LI, Xiaoyong , APTE, Rahul A.
发明人： ZENG, Yi , LI, Xiaoyong , APTE, Rahul A.
IPC分类号： H03F1/26 , H03F3/195 , H03F1/42 , H03F3/347 , H03F3/21 , H03F3/02
CPC分类号： H03F1/0205 , H01B3/004 , H03F1/26 , H03F1/42 , H03F3/195 , H03F3/211 , H03F3/347 , H03F2200/294 , H03F2200/36 , H03F2200/372 , H03F2200/451
摘要： Techniques to improve low noise amplifiers (LNAs) with noise canceling are described. LNA includes a first (24) and a second (26) amplifier which work together to noise cancel the noise generated at an input stage circuit (22). The input stage circuit (22) receives an RF signal and is characterized by a first node and a second node. The first amplifier (24) converts a noise voltage at the first node into a first noise current at an output (220) of the first amplifier (24). The second amplifier (26) is directly coupled to the output of the first amplifier and provides noise canceling by summing the first noise current with a second noise current generated by the second amplifier as a function of the noise voltage at the second node. The proposed techniques eliminate the need for large ac coupling capacitors and reduce the die size occupied by the LNA. The elimination of ac coupling capacitors between amplification stages of the LNA allows current reuse resulting in reduced current consumption.
摘要翻译：描述了改进具有噪声消除的低噪声放大器（LNA）的技术。 LNA包括第一（24）和第二（26）放大器，其一起工作以抵消在输入级电路（22）处产生的噪声的噪声。输入级电路（22）接收RF信号，其特征在于第一节点和第二节点。第一放大器（24）将第一节点处的噪声电压转换为第一放大器（24）的输出端（220）处的第一噪声电流。第二放大器（26）直接耦合到第一放大器的输出，并且通过将第一噪声电流与由第二放大器产生的第二噪声电流相加作为第二节点处的噪声电压的函数来提供噪声消除。所提出的技术消除了对大型交流耦合电容器的需要，并且减小了LNA占用的管芯尺寸。在LNA的放大级之间消除交流耦合电容器允许电流重用，从而减少电流消耗。

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