三角积分调变
积分器
电气工程
电容
电容感应
电容器
CMOS芯片
运算放大器
跨导
放大器
偏移量(计算机科学)
开关电容器
电子工程
运算跨导放大器
计算机科学
物理
电压
工程类
晶体管
电极
量子力学
程序设计语言
作者
Rongshan Wei,Wanjin Wang,Xiaoxia Xiao,Qunchao Chen
出处
期刊:IEEE Access
[Institute of Electrical and Electronics Engineers]
日期:2019-01-01
卷期号:7: 78281-78288
被引量:13
标识
DOI:10.1109/access.2019.2922840
摘要
This paper proposes a low-power delta-sigma capacitance-to-digital converter (CDC) for a capacitive sensor. The input of the capacitive sensor employs a zoomed-in technique with the offset capacitor to extend the input capacitance range. The proposed CDC uses a third-order switched capacitor delta-sigma modulator to provide a digital output, based on a cascade of integrators with a feed forward (CIFF) structure. The current-starved operational transconductance amplifiers (OTAs) are applied in the delta-sigma modulator's first integrator to improve the current efficiency and reduce the power consumption. An auto-zeroing technique is used in the OTAs to reduce their offset and noise. The circuit was implemented in a 0.18-μm CMOS technology and occupies an area of 0.496 mm 2 . The measurable capacitance range of the CDC can be varied from 0 to 8 pF. In a measurement time of 0.8 ms, the delta-sigma CDC achieved a 12.7 effective number of bits while consuming 18.6-μA current from a 2-V supply voltage.
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