Title :
The design and realization of high-fidelity low-frequency power amplifier
Author :
Ling, Zhou ; Xu, Zhang
Author_Institution :
Sch. of Electron. & Inf. Eng., Xianning Univ., Xianning, China
Abstract :
This paper presents a design method of low-frequency small signal amplifier using two-stage amplifier circuit: preamp circuit was composed by differential amplifying circuit and mirror constant - current circuit, and the second-stage amplifier circuit consists of the voltage amplifier circuit and the current amplifier circuit which was constituted by complementary amplifier circuit and the output-driving circuit. Data acquisition and display was achieved by MCU. Noise voltage is less than 5mV, the distortion degree is less than 1%, and frequency band is between 7Hz and 100KHz in this system.
Keywords :
differential amplifiers; microcontrollers; power amplifiers; MCU; complementary amplifier circuit; data acquisition; differential amplifying circuit; frequency 7 Hz to 100 kHz; high-fidelity low-frequency power amplifier; low-frequency small signal amplifier; mirror constant-current circuit; output-driving circuit; preamp circuit; second-stage amplifier circuit; two-stage amplifier circuit; voltage amplifier circuit; Computers; Data acquisition; Design methodology; Education; Electronic circuits; MOSFETs; Power amplifiers; differential amplifying circuit; high-fidelity; low-frequency; power amplifier;
Conference_Titel :
Consumer Electronics, Communications and Networks (CECNet), 2011 International Conference on
Conference_Location :
XianNing
Print_ISBN :
978-1-61284-458-9
DOI :
10.1109/CECNET.2011.5769040
