← 返回 JSSC 论文列表JSSC 2015第8期Data Converters0.18μm CMOSVCO
A Highly Digital VCO-Based ADC Architecture for Current Sensing Applications Pra
一种基于VCO的高度数字化ADC架构，用于电流传感应用，实现二阶噪声整形。
4μA输入电流范围，900pA精度，77.8μA功耗
VCOADC电流传感噪声整形数字滤波器
▸利用传感器隐式电容实现无源积分器和VCO量化器，实现量化误差的二阶噪声整形
▸通过数字IIR滤波器抑制VCO输入摆幅，避免VCO非线性问题
▸采用数字滤波器替代模拟环路滤波器，简化设计并提高可扩展性
Abstract
This paper presents a volt age-controlled oscillator
(VCO) based current to digital converter for sensor readout
applications. Second order noise shaping of the quantization
error is achieved by using implicit capacitance of the sensor to
realize a passive integrator and a VCO-based quantizer. The
non-linearity in voltage to frequency conversion of the VCO is
tackled by placing the VCO in a loop consisting of a simple digital
IIR filter and a passive integrator. The IIR filter provides large
gain