Design of Low Noise Amplifier Based on AVR Single-chip Microcomputer
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.
Keywords：low noise amplifiernoise figureAVR single-chip microcomputer
Publication Date：2012-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：4( 9-12 )