专业英语低频功率放大器翻译.doc

1低频功率放大器（低频功率放大器（GG 题题））湖北师范学院 吴 龙 霍姣姣 许成龙 赛前教师：彭 琦 周兆丰 田开坤 曹庭水 文稿教师:侯向锋 张学文摘要：摘要：本设计主要由低噪声放大电路、带阻滤波电路、信号放大电路、功率放 大电路、峰值检波电路、单片机控制、AD 转换、LCD 显示、稳压电源等电路 组成低噪声放大电路选取甚低噪声宽带高精度运算放大器 OP37，并采用并联 负反馈结构，具有良好的抗共模干扰能力带阻滤波器在 50Hz 频率点输出功率 衰减≥6dB，阻带频率范围为 43～57Hz，有效滤除了工频噪声的干扰功率放 大电路采用的是双 MOS 晶体管的甲乙类推挽放大电路设计的低频功率放大 器的通频带为 6Hz～150kHz，很好地完成了通频带的扩展该设计采用的电路 结构简单，选取的器件价格便宜测试结果表明，该低频功率放大器可以很好 地实现对低频信号的放大作用，具有较高的实用性，其输出带宽、功率、效率 等都达到了较高的指标，为低频功率放大器的设计提供了广阔的思路 关键词：关键词：功率放大器、OP37、MOS 晶体管、输出功率Low frequency power amplifier ( G)Hubei Normal University Wu dragon Huo Jiaojiao Xu ChenglongPre-game counseling teachers: Peng Qi Zhou Zhaofeng Tian Kaikun Cao Tingshui presentation counseling teacher : Hou Xiangfeng Zhang XuewenAbstract: mainly by the design of the low noise amplifier circuit, filter circuit, a signal amplifying circuit, a power amplification circuit, a peak detection circuit, SCM control, AD conversion, LCD display, regulated power supply circuit. Low noise amplifier circuit selection very low noise wideband high precision operational amplifier OP37, and the use of parallel negative feedback structure, with good anti interference capability. Band stop filter in50Hz frequency point output power attenuation was more than 6dB, the stopband frequencies in the range of 43~ 57Hz, effectively filtering the power frequency interference noise. Power amplifying circuit using the double MOS transistor class AB push-pull amplifier circuit. Design of low-frequency power amplifier passband is 6Hz ~150kHz, done a good bandwidth expansion. The design adopts the circuit structure is simple, the selected device cheap. The test results show that, the low frequency power amplifier can realize the on the low frequency signal amplifying function, with high practicality, its output bandwidth, power, efficiency of all reached a high index, for low frequency power amplifier design provides a broad thinking.Key words: power amplifier, OP37, MOS, output power transistor。