Design and Simulation of Low Noise Amplifier in Lower Frequency
Peng Fei Zhao, Fan Li, Jianhui Zhao, Jin Ding · 2016
In order to amplify the output signal of an infrared detector, this paper analyzes the principle of infrared detector and noise characteristics of the amplifier circuit, and based on JFET devices and operational amplifiers a low frequency low noise amplifier is designed.The simulation shows that the gain is as high as 92 dB and the equivalent input noise voltage density within the main frequency is lower than 6.1 nV√Hz.This circuit is an ideal circuit of high gain and low noise for sensors with high output impedance especially for the infrared detector..