首页> 外国专利> RFDAC TRANSMITTER USING MULTIPHASE IMAGE SELECT FIR DAC AND DELTA SIGMA MODULATOR WITH MULTIPLE Rx BAND NTF ZEROS

RFDAC TRANSMITTER USING MULTIPHASE IMAGE SELECT FIR DAC AND DELTA SIGMA MODULATOR WITH MULTIPLE Rx BAND NTF ZEROS

机译:使用多相图像选择FIR DAC和带有多个Rx频段NTF ZEROS的DELTA SIGMA调制器的RFDAC发送器

摘要

A transmitter includes a delta-sigma modulator (100) 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 converter, DAC (200), 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.
机译:发射机包括Δ-∑调制器(100),其特征在于噪声传递函数具有基本上位于接收信号的频带附近的多个零。发射器还部分地包括多相数模转换器DAC(200),其将Δ-∑调制器的输出信号转换成模拟信号。 DAC的特征在于传递函数,该函数将所需信号传递至其输出并衰减采样时钟信号的多个图像。发送器以由采样时钟信号频率的分数的奇数倍定义的频率进行发送。 DAC包括多个级,每级与正在衰减的图像之一相关联。 Δ-∑调制器包括多个级,每个级与零中的不同一个相关联。所述Δ-∑调制器的每一级可选地接收三个抽头系数。

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