【应用】高达2w发射功率的宽带高增益功率放大器ASX620用于对讲机，40%发射效率助力提高通信距离与质量
对讲机基本属于反恐警察的标配，而很多情况下需要更远的通信距离，而通信链路上的射频放大器决定了对讲机的发射功率，决定了最终的通信距离。警用对讲机频段多用350MHz频率，采用电池供电，因此，射频放大器在具备比较大的发射功率的前提下，还要具备更高的发射效率。ASB公司的ASX620具备40%的发射效率和高达2w的发射功率。
ASX620是宽带高增益功率放大器，应用频率高达150MHz~3GHz，适合各频段的广泛应用，其理论工作寿命大于100年，特别是个高可靠特种应用，应用在警用对讲机的350MHz频段的匹配电路如下图所示。
除了偏置电路，主要的匹配电路是C2、C3及L4，在实际测试中，如果频率略微偏移，只需调整这三个器件的值就可以让放大器工作在最佳频段，增益及其他性能表现如下图所示。
有上图可知，ASX620应用在350MHz频段的主要特点及带来的性能表现如下：
1、 增益高达39dB，减少了前级放大及驱动放大的使用，简化了电路，降低了成本。
2、 输出P-1高达32.5dBm，饱和推动下的输出功率大于2w。能够达到更远的通信距离，特别是在环境比较复杂的情况下，通信效果更好。
3、 IP3指标44dBm，高线性度，提高对讲机的抗干扰能力。
4、 供电电流950mA，发射效率高达40%，在同样发射功率的情况下，效率更高，电池供电时，能够使对讲机工作更长时间。
综上，ASX620的高性能和高可靠性特性，非常适合应用在350MHz的警用对讲机上。其宽带特性，可以作为通用物料应用于其他产品上，作为近邻韩国品牌，在供应商也有保证，可以放心使用。
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产品型号
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品类
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Frequency Range(MHz)
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Application
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Frequency(MHz)
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Gain(dB)
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NF(dB)
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OP1dB(dBm)
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OIP3(dBm)
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Vd(V)
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Id(mA)
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Package
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ASX401
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Medium Power Amplifier
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100 ~ 3000
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GSM
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890 ~ 915
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19.3
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4.4
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30
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47
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5
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290
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SOT89
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