基于AD8515的低压低功耗音频放大电路的设计与实现  

Design and implementation of low-voltage low-power audio amplifier circuit

作　　者：党智乾[1] 乔琳君[1] 曹海红[1] 杨春 Dang Zhiqian;Qiao Linjun;Cao Haihong;Yang Chun(Xi’an Aeronautical Polytechnic Institute,Xi’an 710089,China)

机构地区：[1]西安航空职业技术学院,西安710089

出　　处：《电子测量技术》2020年第19期144-147,共4页Electronic Measurement Technology

基　　金：陕西省教育科学“十三五”规划课题(SGH16V009);中国职业技术教育学会教学工作委员会2019~2020年度职业教育教学改革课题(1910600);西安航空职业技术学院院级教改重点课题(18XHJG-008)项目资助。

摘　　要：选用ADI公司的AD8515低噪声运算放大器芯片,设计了一款低压低功耗低噪声放大器。该放大器的供电电压为1.8 V,静态工作电流小于1 mA。输入为音频信号,其空载幅度不超过10 mV,输出阻抗等于2.2 kΩ。下限截止频率小于10 Hz,上限截止频率大于50 kHz,输入空载10 mV,频率1 kHz时,输出不产生失真且幅度大于0.88 V,输出噪声小于2 mVrms。仿真测试结果验证了所设计的低功耗方法具有低功耗、低噪声、可靠性好等特点。Selects the AD8515 low-noise operational amplifier chip from ADI to design a low-voltage,low-power,low-noise amplifier. The power supply voltage of this amplifier is 1.8 V,and the quiescent operating current is less than 1 mA. The input is an audio signal,its no-load amplitude does not exceed 10 mV,and the output impedance is equal to 2.2 kΩ. The lower limit cut-off frequency is less than 10 Hz,the upper limit cut-off frequency is greater than 50 kHz,the input is no-load 10 mV,at 1 kHz,the output does not produce distortion and the amplitude is greater than 0.88 V,and the output noise is less than 2 mVrms. The simulation test results verify that the designed low power consumption method has the characteristics of low power consumption,low noise and good reliability.

关 键 词：低功耗 低噪声放大器 高增益 

分 类 号：TN722.3[电子电信—电路与系统]