DX-200中波发射机射频功率放大器工作原理  

Working Principle of RF Power Amplifier for DX-200 Medium Wave Transmitter

作　　者：胡东奇 HU Dongqi(Henan Radio and Television Station 104,Zhengzhou 450000,China)

机构地区：[1]河南广播电视台104台,河南郑州450000

出　　处：《电视技术》2023年第6期104-107,111,共5页Video Engineering

摘　　要：数字化调幅发射机由音频信号+直流信号+72 kHz超音频三角波产生复合信号,经过模/数(A/D)转换,变化成12 bit的数字化信号,经过调制编码板编码后去控制224个射频放大器通断,产生调幅波。DX系列发射机的设计是积木化的,各种型号发射机的不同之处在于射频功率放大器模块的总数和单块模块的输出功率不同,从而可以产生出不同的功率等级。基于此,以DX-200数字化中波发射机为例,介绍射频功率放大器的工作原理。对于其他功率等级的发射机,可以举一反三。The digital amplitude modulation transmitter generates a composite signal from audio signal,DC signal,and 72 kHz super audio triangle wave.After Analog-to-Digital(A/D)conversion,it is transformed into a 12 bit digital signal.After being encoded by a modulation encoding board,it controls the on-off of 224 RF amplifiers to generate amplitude modulation waves.The design of the DX series transmitter is modular,and the difference between different models of transmitters lies in the total number of RF power amplifier modules and the output power of individual modules,which can generate different power levels.Based on this,this article takes the DX-200 digital medium wave transmitter as an example to introduce the working principle of RF power amplifier.For transmitters of other power levels,we can draw inferences from one example.

关 键 词：射频功率放大器 调制器 场效应管 

分 类 号：TN838[电子电信—信息与通信工程]