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本文介绍一种采用高效率放大器的道赫特调幅制式:HEAD,论述了HEAD的设计特点,并将它和别的调幅制式作了一些比较。HEAD采用了两项成熟的技术:道赫特放大器和泰勒高效率射频放大器。本文对这两项技术作了评述,并介绍了它们在HEAD制式中的应用。HEAD被认为可以替换脉宽调制,特别是用在大功率中波广播发射机上。这种制式没有脉宽调制所固有的杂散辐射,总效率却与之相当。功耗现已成为首要因素。因此,本文的注意力集中在这个方面。文中对一个假想的中波发射机分别采用HEAD、B类和两种脉宽调制调幅制式时的功耗进行了比较,并由此作出结论。
This article introduces a high-efficiency amplifier of the Hertz amplitude modulation system: HEAD, discusses the HEAD design features, and it and some other AM system made some comparisons. HEAD employs two proven technologies: the Doherty amplifier and the Taylor high-efficiency RF amplifier. This article reviews these two technologies and describes their use in the HEAD standard. HEAD is considered as an alternative to pulse width modulation, especially for high power medium wave broadcast transmitters. This system does not have the inherent spurious radiation pulse width modulation, the total efficiency is comparable. Power consumption has now become the primary factor. Therefore, this article focuses on this aspect. In this paper, we compare the power consumption of an imaginary medium-wave transmitter with HEAD, B and two pulse-width modulated AM systems, respectively, and draw conclusions.