Chapter 9 Communications Circuits An amplifier takes the input signal and produces an exact replica(including noise and distortion) at a higher level on the output Analog signal Leaving Source Source Amplified signal After Transmission, Showing Still Distorted Attenuation and Distortion Amplifier Figure 9-3 Amplification of an analog signal www.gxmu.edu.cnFigure 9-3 Amplification of an analog signal. An amplifier takes the input signal and produces an exact replica (including noise and distortion) at a higher level on the output. www.gxmu.edu.cn Chapter 9 Communications Circuits