BJT Performance Test Device

BJT is called bipolar junction transistor, also known as transistor. In the design, we have no distortion, top distortion, bottom distortion, bidirectional distortion, and crossover distortion analog output for the input of 20mv, 1kHz sine wave signal. For no distortion, top distortion and bottom distortion, we can achieve different distortion waveforms by adjusting the static operating point of the bipolar common emitter amplifier circuit; for bidirectional distortion, increase the gain of the amplifier circuit to make the output The waveform with bidirectional distortion occurs; for crossover distortion, the push-pull amplifier circuit is controlled by the bias of the diode and the switch to realize the waveform with crossover distortion and eliminate the waveform of crossover distortion. The general idea of the system is to send a command request to the msp430 through the LCD screen, control the relay through the output of the msp430, and then control the signal output to generate waveforms with no distortion, top distortion, bottom distortion, bidirectional distortion, and crossover distortion. Finally, the data output is sampled through the msp430, and the sampled signal is transmitted to the host computer for the calculation of the total harmonic distortion. Finally, the host computer transmits it to the msp430, and the msp430 will pass the band-pass filter. The degree value is transmitted to the LCD screen for display.