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Invention Grant
US08339297B2 Delta-sigma modulator and dithering method including a dithering capability for eliminating idle tones 有权
Δ-Σ调制器和抖动方法包括用于消除空闲音调的抖动能力

Delta-sigma modulator and dithering method including a dithering capability for eliminating idle tones
Abstract:
A delta-sigma modulator (100) including a dithering capability for eliminating idle tones is provided according to the invention. The delta-sigma modulator (100) includes a bitstream converter (107) configured to generate a digital signal output substantially corresponding to an analog signal input, a periodicity detector (111) coupled to the bitstream converter (107) and configured to detect periodicity in the digital signal output, and a dithering sequence generator (116) connected to and activated by the periodicity detector (111). The dithering sequence generator (116) generates a dithering sequence. The delta-sigma modulator (100) further includes a pulse-width modulation (PWM) generator (119) coupled to the dithering sequence generator (116) and receiving the dithering sequence. The PWM generator (119) modulates the dithering sequence onto the analog signal input of the delta-sigma modulator (100) as a dithering signal.
Abstract(Chinese):

根据本发明提供了包括用于消除空闲音调的抖动能力的Δ-Σ调制器（100）。 Δ-Σ调制器（100）包括比特流转换器（107），其被配置为生成基本上对应于模拟信号输入的数字信号输出，耦合到位流转换器（107）的周期性检测器（111） 数字信号输出端，以及与周期性检测器（111）连接并由周期检测器（111）激活的抖动序列发生器（116）。 抖动序列发生器（116）产生抖动序列。 Δ-Σ调制器（100）还包括耦合到抖动序列发生器（116）并接收抖动序列的脉冲宽度调制（PWM）发生器（119）。 PWM发生器（119）将抖动序列调制到Δ-Σ调制器（100）的模拟信号输入上作为抖动信号。

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