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1.发明公开
公开(公告)号：EP2520024A1
公开(公告)日：2012-11-07
申请号：EP12712212.5
申请日：2012-01-05
IPC分类号： H03M3/00
摘要： An apparatus includes a clock source and an oversampled continuous-time digital-to-analog converter. Noise signal is added to the clock signal as the clock signal is generated and/or routed. The oversampled continuous-time digital-to-analog converter includes a sigma-delta modulator to perform noise shaping on input data samples and provide intermediate data samples; a filter to filter the intermediate data samples and generate filtered samples, the filter having a transfer function that has a stop band at a frequency range that includes the frequency of the noise signal or a component of the noise signal; and a continuous-time digital-to-analog converter to convert the filtered samples to an output analog signal.
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2.发明公开CALIBRATION OF TIME CONSTANTS IN A CONTINUOUS-TIME DELTA-SIGMA CONVERTER 审中-公开时间在恒定ZEITKONTINUERLICHENΔ-Σ转换器校准
公开(公告)号：EP2659591A1
公开(公告)日：2013-11-06
申请号：EP11852259.8
申请日：2011-10-28
IPC分类号： H03M1/10
摘要： A circuit for calibrating selective coefficients of a delta-sigma modulator is provided. The circuit includes a calibration logic module that is coupled to one of a plurality of stages of the delta-sigma modulator. The calibration logic module measures the oscillating frequency of a respective stage and compares it to a reference frequency. The calibration logic adjusts a selective circuit component associated with the respective stage so that the reference frequency and the oscillating frequency match.
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