三角积分调变
增量调制
脉冲宽度调制
调制(音乐)
物理
脉冲频率调制
频率调制
三角洲
特征(语言学)
镜头(地质)
西格玛
光学
脉冲幅度调制
脉搏(音乐)
计算机科学
无线电频率
光电子学
电信
电压
声学
CMOS芯片
探测器
量子力学
哲学
语言学
天文
作者
Víctor Medina,Pieter Rombouts,Luis Hernández
出处
期刊:IEEE Circuits and Systems Magazine
[Institute of Electrical and Electronics Engineers]
日期:2024-01-01
卷期号:24 (2): 80-97
被引量:2
标识
DOI:10.1109/mcas.2024.3352552
摘要
The fact that VCO-ADCs produce noise-shaped quantization noise suggests that a link between frequency modulation and Sigma-Delta modulation should exist. The connection between a VCO-ADC and a first-order Sigma-Delta modulator has been already explained using Pulse Frequency Modulation. In this article, we attempt to extend this explanation to a generic Sigma-Delta modulator. We show that the link between Sigma-Delta modulation and Pulse Frequency Modulation relies in a sampling invariance property that defines the equivalence between both entities. This equivalence property, allows to go beyond the white quantization noise model of a Sigma-Delta modulator, revealing the origin of some nonlinear phenomena. We first predict spurious tones which cannot be explained by circuit non linearity. Multi-bit and single-bit modulators are shown to belong to a same generic class of systems. Finally, quantizer overload is analyzed using our model. The results are applied to Continuous-Time Sigma-Delta modulators of orders one, two and three and then extended to a generic case.
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