摘要
基于霍尔传感器低功耗的要求,设计一种低功耗、可以放大微弱霍尔电压的放大器。利用MOSFET工作在亚阈区超低功耗特性,设计一种CMOS二级运算放大器。这种亚阈区放大器结构简单,工作在2.5V～3.5V电压下,电路开环增益可以达到90dB。
Based on low-power requirements of Hall-sensors, a low-power amplifier for amplifying small Hall-voltage signals is designed in this paper. According to super-low power features of MOSFET working in subthreshold region, a simple CMOS two-stage operational amplifier is designed. This amplifier can work between working voltage from 2.5V to 3.5V, and the open-loop gain can get 90dB.
出处
《传感器世界》
2012年第6期6-9,4,共5页
Sensor World
关键词
霍尔电压
低功耗
亚阈区
运算放大器
开环增益
Hall voltage
power consumption
subthreshold region
operational amplifier
open-loop gain
