论文部分内容阅读
由于调谐输出电路和直流功率输入电路的限制,在一般情况下,是不能由同一个射频功谐放大电路同时实行 B 类工作和 D 类工作的。但由于在 D 类电流开关型射频放大电路中采用了方波驱动,从而使放大器能够从电流源逐步转变到电流开关工作。这种放大器,就称为 BD 类放大器,它具有线性转换器的特性(驱动包络至输出包络),而且在相同的输出峰值时,它的效率为 B 类射频放大器的效率的1.23倍。在 BD 类射频放大器的直流功率输入电路中加上一个接地的电阻交流通路,就可以采用正弦波驱动波形来工作。这种放大器一方面可以降低峰值输出时的效率,又可以提高较低输出时的效率,从而使具有大的峰值一平均值比的信号的放大效率提高到层值的1.57倍,因此在宽频带中,可以用 BD 射频放大器来代替 Doherty 型放大器。
Due to the limitations of the tuned output circuit and the DC power input circuit, it is generally not possible to perform both Class B and Class D operations by the same RF power amplifier. However, due to the use of square wave drive in the class D current switching RF amplifier circuit, so that the amplifier can be gradually switched from the current source to the current switch. This amplifier, called the BD amplifier, has the characteristics of a linear converter (drive envelope to output envelope) and at the same output peak efficiency of 1.23 times the efficiency of a Class B RF amplifier. In the BD RF amplifier DC power input circuit plus a grounding of the AC resistance, you can use the sine wave drive waveform to work. On the one hand, this amplifier can reduce the peak output efficiency, but also can improve the efficiency of the lower output, so that with a large peak-average signal amplification efficiency to 1.57 times the value of the layer, so in the broadband , You can use a BD radio frequency amplifier instead of Doherty amplifier.