清华大学 电子工程系,北京,100084
纸质出版:2016
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闫宁, 李冬梅, 李国林. 一种双模可配置Delta-Sigma调制器的设计[J]. 微电子学与计算机, 2016, 33(12): 42-46.
YAN Ning, LI Dong-mei, LI Guo-lin. Design of a Dual-Mode Configurable Delta-Sigma Modulator[J]. 2016, 33(12): 42-46.
本论文提出了一种双模可配置Delta-Sigma(ΔΣ)调制器
该调制器可配置为两种结构: 适用于低频高精度应用的3阶4比特量化的结构和适用于高频低精度应用的2阶4比特量化的结构.调制器在两种模式下复用了包括开关和电容在内的绝大部分电路模块
并采用了一种高效的运算放大器(OTA)结构和带有输入失调校准技术(IOS)的比较器结构
此外还引入了动态元件匹配(DEM)电路来减小电容失配的影响.本设计使用的是0.18m的CMOS工艺
调制器在两种模式下分别可以达到77.1dB和108.9dB的峰值信号谐波失真比(SNDR)
对应的输入信号带宽分别为1.25 MHz和39kHz
芯片的整体功耗为12mW.
This paper presents a dual-mode delta-sigma(ΔΣ)modulator.The modulator can be configured for two structures
3rd-order 4-bit in low-frequency high-resolution applications
and 2nd-order 4-bit in high-frequency lowresolution applications.Most of the circuit parts including the capacitors and switches are shared in both modes.An efficient OTA and comparators with Input Offset Calibration(IOS)technique are adopted.The modulator is fabricated in0.18m CMOS technology.It achieves 77.1dB and 108.9dB peak signal-to-noise and distortion ratio(SNDR)separately in two modes with 39 kHz and 1.25 MHz input signal bandwidth.The power consumption is about 12 mW.
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