RFDAC Transmitter Using Multiphase Image Select FIR DAC and Delta Sigma Modulator with Multiple Rx Band NTF Zeros
    5.
    发明申请
    RFDAC Transmitter Using Multiphase Image Select FIR DAC and Delta Sigma Modulator with Multiple Rx Band NTF Zeros 审中-公开
    RFDAC发射机使用多相图像选择具有多个Rx带NTF零点的FIR DAC和Delta Sigma调制器

    公开(公告)号:US20150085902A1

    公开(公告)日:2015-03-26

    申请号:US14034243

    申请日:2013-09-23

    Abstract: A transmitter includes a delta-sigma modulator characterized by a noise transfer function having a multitude of zeroes positioned substantially near a frequency band of a receive signal. The transmitter further includes, in part, a multi-phase digital-to-analog (DAC) converter converting an output signal of the delta-sigma modulator to an analog signal. The DAC is characterized by a transfer function that passes the desired signal to its output and attenuates a multitude of images of the sampling clock signal. The transmitter transmits at a frequency defined by an odd multiple of a fraction of the sampling clock signal frequency. The DAC includes a number of stages each pair of which is associated with one of the images being attenuated. The delta-sigma modulator includes a multitude of stages each associated with a different one of the zeroes. Each stage of said delta-sigma modulator optionally receives three tap coefficients.

    Abstract translation: 发射机包括Δ-Σ调制器,其特征在于具有基本上接近接收信号的频带的多个零的噪声传递函数。 发射机还部分地包括将Δ-Σ调制器的输出信号转换为模拟信号的多相数模(DAC)转换器。 DAC的特征在于将所需信号传递到其输出并衰减采样时钟信号的大量图像的传递函数。 发射机以由采样时钟信号频率的一部分的奇数倍定义的频率发射。 DAC包括多个阶段,每个阶段与被衰减的图像中的一个相关联。 Δ-Σ调制器包括多个级,其各自与不同的一个零相关联。 所述Δ-Σ调制器的每个级可任选地接收三个抽头系数。

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