| 基于AVR的低噪声放大器设计 |
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| 引用本文： | 丁金林.基于AVR的低噪声放大器设计[J].苏州市职业大学学报,2012,23(3):9-12. |
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| 作者姓名： | 丁金林 |
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| 作者单位： | 苏州市职业大学电子信息工程系,江苏苏州,215104 |
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| 基金项目： | 苏州市职业大学创新基金资助项目(2011SZDCC01) |
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| 摘 要： | 设计并制作一个3 MHz高性能低噪声放大器,以增益稳定、输入低噪声的电压反馈放大器OPA820作为前置放大器,采用二阶低通滤波器实现对3 MHz以上信号衰减,并经功率放大器进行电压及功率放大.为检测低噪声放大器的性能,将功率信号通过隔离、真有效值转换,用AVR单片机进行采集并经LCD显示放大器输出电压有效值和峰峰值.由测试数据可知,放大器的性能优良,电压增益大于40 dB,最大不失真输出电压峰峰值大于10 V,有很强的实用性.
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| 关 键 词： | 低噪声放大器 噪声系数 AVR单片机 |
Design of Low Noise Amplifier Based on AVR Single-chip Microcomputer |
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| DING Jin-lin.Design of Low Noise Amplifier Based on AVR Single-chip Microcomputer[J].Journal of Suzhou Vocational University,2012,23(3):9-12. |
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| Authors: | DING Jin-lin |
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| Institution: | DING Jin-lin (Department of Electronic Information Engineering,Suzhou Vocational University,Suzhou 215104,China) |
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| Abstract: | A new design of 3 MHz high performance low noise amplifier(LNA) was proposed in this paper.Voltage feedback amplifier OPA820 which has gain stabilization and input low noise is used as preamplifier,second-order low pass filter is adopted to attenuate signal over 3 MHz,and magnify signal through power amplifier.In order to test LNA performance,after power signal isolation and true RMS-to-DC conversion,microcomputer gathers and process data,finally display RMS and peak-to-peak value by liquid crystal display.According to test data,designed LNA has fine performance,voltage gain is no less than 40 dB,and maximum undistorted output peak-to-peak voltage is higher than 10 V.It has strong practicability. |
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| Keywords: | low noise amplifier noise figure AVR single-chip microcomputer |
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