实现宽带信号放大，由AD603级联组成增益放大器，实现增益 -20～60dB 范围内可按5dB步进调节或连续可调，且在0～9MHz通频带内增益起伏在1dB以下 互补三极管射级跟随高功率输出在50 负载上最大输出电压有效值Vo≥10V,波形无明显失真 功放输出信号经有效值检波后，通过10位A/D转换芯片TLC1549，将模拟电压的有效值转换成数字信号，并送微控制器实现增益预置与显示。-Broadband signal is amplified by the AD603 gain amplifier cascade components, to achieve the gain range of-20 ~ 60dB 5dB step can be adjusted or continuously adjustable, and in the pass band of 0 ~ 9MHz 1dB gain fluctuations in the following　complementary transistor radio level follow the high power output in the 50 　load the maximum output voltage RMS Vo ≥ 10V, no significant waveform distortion　amplifier output signal by the RMS detector, through 10-bit A/D converter chip TLC1549, will convert the analog voltage RMS digital signal, and sent to the microcontroller and display presets to achieve the gain.