基于单片机的自动增益功率放大器设计

Design of Automatic Gain Power Amplifier Based on Single Chip Microcomputer

自动增益控制电路的作用是对运算放大器的增益进行控制,即对输入输出信号的压缩比例进行控制进而保证信号质量,该电路被广泛用于接收机电路设计及音频电路设计中。文中对自动增益放大器电路进行设计,硬件电路包括单片机控制模块、信号输入模块和自动增益放大器模块。其中,自动增益放大器模块又包括峰值检波电路与程控放大电路。通过对电路中使用的芯片进行合理地选型,并完成系统的设计。实验结果显示,当输入信号频率及幅值发生变化时且电路能保持稳定的信号输出,表明该系统满足设计的要求。

The function of the automatic gain control circuit is to control the gain of the operational amplifier, that is, to control the compression ratio of input and output signals to ensure signal quality. This circuit is widely used in receiver circuit design and audio circuit design. This text designs the automatic gain amplifier circuit, the hardware circuit includes the one-chip computer control module, the signal input module, the automatic gain amplifier module. Among them, the automatic gain amplifier module includes a peak detector circuit and a program-controlled amplifier circuit. Reasonably select the chip used in the circuit,and finally complete the system design. Experiments show that when the input signal frequency and amplitude change, the circuit can maintain a stable signal output, indicating that the system meets the design requirements.