电子通信类高频电路实验材料，含四个实验，分别是高频小信号调谐放大器、高频功率放大器、正弦波振荡器、振幅调制器-High-frequency circuits of electronic communications class experimental materials, including four experiments, namely, small-signal high-frequency tuned amplifier, high-frequency power amplifiers, sine wave oscillator, amplitude modulator