[Nanjing Post and Telecommunications Competition] Emitter Follower

Question requirements: Realize 2vpp signal input with almost no voltage gain, only current gain, and no obvious distortion output.
Award information: First prize at the school level.
Team information: Peng Peiyao, Wang Shiyuan, Ge Han
Instructors: Hao Xueyuan, Dai Haihong
                                                                                                      2019 National College Student Electronic Design Competition Design Report
1. Working principle of the design plan
1. The expected experimental target positioning
is to create an amplifier nonlinear distortion research device, with a frequency of 1kHz and a peak value of Amplify the sine wave signal with a peak value of 20mV, and output no obvious distortion and four distortion waveforms. Collect the above five waveforms and calculate the approximate value of the "total harmonic distortion" of the output voltage, select the signal status and output the "total harmonic distortion" "The approximate value display is realized on the serial port screen.
2. System flow analysis
The flow chart of the entire system is shown in Figure 3-1:
3. Circuit schematic diagram