Analog-to-digital conversion via duty-cycle modulation
Analog-to-digital conversion via duty-cycle modulation
复制标题
通过占空比调制进行模数转换
DOI：
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发表时间：
1997
期刊：
影响因子：
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通讯作者：
E. Roza
中科院分区：
文献类型：
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作者：
E. Roza
将幅度轴交换为时间轴提供了克服低压CMOS电路中模数转换的分辨率问题和/或规避硅化工艺中特殊电阻器选项的可能性。这种交换可以通过某种形式的占空比调制来实现。为了实现它，描述了一种电路配置，包括异步Σ-Δ调制器，随后是相位同步抽头环形振荡器，其产生用于以相对低的频率对异步信号进行采样的多相信号。一个详细的分析，准确地预测的转换方案的属性方面的混叠，量化噪声和非线性失真。设计实例的仿真结果说明了这一点。
An exchange of the amplitude axis for the time axis offers a possibility of overcoming resolution problems in analog-to-digital conversion in low-voltage CMOS circuits and/or of circumventing special resistor options in silicided processes. This exchange can be effected via some form of duty-cycle modulation. For its implementation a circuit configuration is described, consisting of an asynchronous sigma-delta modulator, followed by a phase-synchronized tapped ring oscillator which produces a poly-phase signal for sampling the asynchronous signal at a relatively low frequency. A detailed analysis is presented which accurately predicts the properties of the conversion scheme with respect to aliasing, quantization noise and nonlinear distortion. The results are illustrated with simulations of a design example.