Design And Realization Of A Kind Of Class AB Power Amplifier With Signal Source

In order to drive the load，the output stage of the circuit are often required to be able tooutput a certain power，in practical circuit． However，the original signal is so weak that itis not enough to drive the load． In order to meet the needs of such a case，it is necessary todesign a suitable power amplifier for power amplification of the original signal to providesufficient power to the load．This paper designs and realizes a kind of class AB power amplifier with signalsource．If the output port of the power amplifier is connected to the input port of the signalsource，the signal generated by its own signal source will be amplified．If it is connected toother signal source，the signal generated by it will be amplified．This system mainlyincludes two units：a signal generating unit and a power amplification unit．Signalgeneration unit includes MCU control module，waveform generator module and amplitudeadjustment module．This system uses the MSP430F1611as the main control chip，receivesthe parameter information of the signal to be generated，that is set by user on a computer，through the RS232interface．Then MCU controls waveform generator module to generate asinusoidal signal whose frequency and phase are adjustable．The amplitude of the signal willbe adjusted by amplitude adjustment module，then we get the signal we need．Poweramplification unit includes power amplifier module and sampling circuit．In order to be ableto reach more than100W output power，the power amplifier circuit with two LM3886inparallel is designed．The job of power amplification of the sinusoidal signal generated by thesignal generating module is finished by this circuit．After that，we do voltage sampling andcurrent sampling of the load and temperature sampling of the cooling ribs．The sampledsignal will be sent to the ADC module of MCU for further feedback regulation．When thesignal meets the requirement，the waveform of it will be shown on the computer．This paper focuses on the design and realization of the hardware platform and thesoftware part．An experiment is taken to test the system in the fifth chapter．The resultsshow that the system can achieve the desired technical indicators and meet therequirements．...