Modern high performance radio systems increasingly rely on digital signal processing techniques. In many cases performance is limited by the A-D conversion process, particularly where high linearity is required. In this paper three examples are presented of bandpass sigma-delta A-D converters which offer a cost effective means of encoding narrowband IF signals to a high linearity and with low spurious content.
KeywordsLoop Filter Sigma Delta Modulator Noise Transfer Function Noise Shaping Spurious Free Dynamic Range
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