一种用于数字麦克风的低功耗低电压LDO  

A Low-Power and Low-Voltage LDO for Digital Microphones

作　　者：华斯亮[1,2] 刘岩[1] 王东辉[1] 侯朝焕[1] 

机构地区：[1]中国科学院声学研究所,北京100190 [2]中国科学院研究生院,北京100190

出　　处：《微电子学》2009年第2期215-218,共4页Microelectronics

摘　　要：数字麦克风具有抗干扰能力强、集成度高、易于使用等优点，用于对功耗、体积敏感的便携式设备。研究了用于数字麦克风的低压差线性稳压器（LDO），该LDO除了具有稳压功能，为系统提供稳定和确定的电压外，还能在时钟频率低于休眠频率时，使数字麦克风进入休眠状态。流片测试表明，LDO电压调节范围为1．6～3．5V，休眠频率为40-60kHz，芯片待机电流为9μA。With such advantages as anti-jamming, high integration and convenience in application, digital microphones are widely used in portable instruments that are sensitive to both power and size. A low drop-out regulator （LDO）for digital microphones was presented. In addition to providing a steady power supply, the clock frequency controlled LDO can put the digital microphone into sleep mode when the clock frequency is below a designed threshold. Measurement results showed that the device had a voltage regulating range from 1.6 V to 3. 5 V,a sleeping frequency of 40 kHz to 60 kHz,and a sleeping current of 9 μA.

关 键 词：低压差线性稳压器 数字麦克风 模拟集成电路 

分 类 号：TP423[自动化与计算机技术] TN431.1[电子电信—微电子学与固体电子学]