Abstract
A new design approach of a digital delta-sigma modulator with small output fluctuation is proposed. The digital delta-sigma modulators are used in the digital-analog converters, the fractional-N phase lock loop, etc. and its output fluctuation is one of the important performances although a higher order modulator often produces large fluctuations. In this work, the noise shaping filter of the modulator is operated so that the operating point may maintain close to a sliding plane by selecting the output value to reduce the fluctuation of the output signal. By employing the sliding plane, the degrees of the freedom of the output signal is enhanced.
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