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公开(公告)号：US06891423B2
公开(公告)日：2005-05-10
申请号：US10383370
申请日：2003-03-06
申请人： Christian Björk , Magnus Wiklund , Sven Mattisson
发明人： Christian Björk , Magnus Wiklund , Sven Mattisson
CPC分类号： H03D7/1441 , H03D7/1433 , H03D7/1458 , H03D7/1483 , H03D7/165 , H03D2200/009
摘要： A quadrature switching mixer is provided for mixing a received RF signal and a local oscillator signal, while rejecting an image signal associated with the RF signal. Input signal components in quadrature, that is, I and Q input components derived from the received RF signal, are respectively coupled through first and second input paths to corresponding commuting switches in a configuration of switches. Each of the switches operates to multiply respective quadrature components of RF and local oscillator signals to provide quadrature output signal components. A unidirectional device, such as a buffer amplifier included in a signal splitter, is placed in each input path to prevent any portion of an output signal component from leaking backward through one of the input paths to the other input path, and thus to the other output signal component.
摘要翻译： 提供了正交开关混频器，用于混合接收的RF信号和本地振荡器信号，同时拒绝与RF信号相关联的图像信号。 正交的输入信号分量，即从接收的RF信号导出的I和Q输入分量分别通过第一和第二输入路径耦合到交换机的配置中的对应的通勤交换机。 每个开关操作以将RF和本地振荡器信号的相应正交分量相乘以提供正交输出信号分量。 诸如信号分离器中包括的缓冲放大器的单向设备被放置在每个输入路径中，以防止输出信号分量的任何部分通过输入路径中的一条向后泄漏到另一输入路径，从而向另一个 输出信号分量。
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公开(公告)号：US07054609B2
公开(公告)日：2006-05-30
申请号：US10400114
申请日：2003-03-26
申请人： Magnus Wiklund , Sven Mattisson
发明人： Magnus Wiklund , Sven Mattisson
CPC分类号： H03D7/1441 , H03D7/1433 , H03D7/1458 , H03D7/1491
摘要： Method and system are disclosed for providing an improved linearity Gilbert mixer. The Gilbert mixer of the present invention includes a conventional mixer core coupled to a high linearity, multistage amplifier. The multistage amplifier includes two or more transistor stages connected together in a global feedback arrangement. The global feedback provides a greater loop gain for the amplifier than the local feedback arrangement, thereby increasing the linearity of the amplifier. In addition, having more than one transistor stage in the amplifier serves to increase the isolation of the RF input signal from the LO input signal. Furthermore, by providing parallel output stages in the multistage amplifier, several mixer cores may be driven from the same source while sharing the feedback mechanism.
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