该系统设计分别是由前级放大电路、程控增益放大电路、功率放大电路、PWM

该系统设计分别是由前级放大电路、程控增益放大电路、功率放大电路、PWM增益控制电路、峰值检测电路、单片机与显示等几大主模块组成，具有宽带可以通过按键实现连续电压调节以实现数字程控增益功能。该系统采用压控增益器件，将放大器进行合理的级联和阻抗匹配，从而实现电压增益大于40dB和总增益在12dB ~ 40dB的宽频带范围内线性变化的设计要求，对于输入高频信号可分别通过前级弥补一般电压反馈型放大器的带宽随增益增加而急剧降低和压摆率不足的问题和后级实现全面提高增益带宽积和输出电压幅度。数字信号处理技术和单片机可以实现对增益进行预置和控制，可控带宽范围大、抑制噪声、输出信号稳定，实现增益可以自动的需求。在整体的电路设计中分别应用了电容去耦、滤波屏蔽线传输信号等抗干扰措施使信号输出更加稳定从而以减少放大器的噪声并抑制高频自激。

该系统设计分别是由前级放大电路、程控增益放大电路、功率放大电路、PWM增益控制电路、峰值检测电路、单片机与显示等几大主模块组成，具有宽带可以通过按键实现连续电压调节以实现数字程控增益功能。 该系统采用压控增益器件，将放大器进行合理的级联和阻抗匹配，从而实现电压增益大于40dB和总增益在12dB ~ 40dB的宽频带范围内线性变化的设计要求，对于输入高频信号可分别通过前级弥补一般电压反馈型放大器的带宽随增益增加而急剧降低和压摆率不足的问题和后级实现全面提高增益带宽积和输出电压幅度。 数字信号处理技术和单片机可以实现对增益进行预置和控制，可控带宽范围大、抑制噪声、输出信号稳定，实现增益可以自动的需求。 在整体的电路设计中分别应用了电容去耦、滤波屏蔽线传输信号等抗干扰措施使信号输出更加稳定从而以减少放大器的噪声并抑制高频自激。

The design of the system is composed of several main modules, such as front stage amplifier circuit, program-controlled gain amplifier circuit, power amplifier circuit, PWM gain control circuit, peak detection circuit, single chip microcomputer and display circuit. It has the function of wide band, continuous voltage regulation by pressing the key to realize digital program-controlled gain. The system uses voltage controlled gain devices, cascades the amplifiers reasonably and matches the impedance, so that the voltage gain is more than 40dB and the total gain is less than 12dB~ According to the design requirement of 40dB wide-band linear variation, for the input high-frequency signal, the former stage can make up for the problems that the bandwidth of general voltage feedback amplifier decreases sharply with the increase of gain and the voltage swing rate is insufficient, and the latter stage can comprehensively improve the gain bandwidth product and output voltage amplitude. Digital signal processing technology and single chip microcomputer can realize the preset and control of gain, which can control a wide range of bandwidth, suppress noise, stabilize output signal, and realize the demand of automatic gain. In the whole circuit design, the anti-interference measures such as capacitance decoupling, filtering shield wire transmission signal are applied to make the signal output more stable, so as to reduce the noise of the amplifier and suppress the high frequency self excitation.<BR>