NXP BLF888 500W RF广播发射方案

NXP 公司的BLF888是500W LDMOS RF功率晶体管，用于广播发射和工业应用。在UHF频带470 MHz 到860 MHz可提供平均功率110W，峰值包络功率500W，功率增益19dB，漏极效率46%，VDS 电压50 V，漏极静态电流1.3A。本文主要介绍了BLF888主要特性和优势，AB类共源宽带放大器电路和元件列表以及PCB布局图和元件布局图。

A 500 W LDMOS RF power transistor for broadcast transmitter applications and industrial applications. The transistor is optimized for digital applications and can deliver 110 W average DVB-T broadband over the full UHF band from 470 MHz to 860 MHz. The excellent ruggedness of this device makes it ideal for digital transmitter applications.

BLF888主要特性和优势：
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2-Tone performance at 860 MHz, a drain-source voltage VDS of 50 V and a quiescent drain current IDq = 1.3 A:
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Peak envelope power load power = 500 W
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Power gain = 19 dB
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Drain efficiency = 46 %
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Third order intermodulation distortion = 32 dBc
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DVB performance at 858 MHz, a drain-source voltage VDS of 50 V and a quiescent drain current IDq = 1.3 A:
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Average output power = 110 W
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Power gain = 19 dB
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Drain efficiency = 31 %
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Shoulder distance = 31 dBc (4.3 MHz from center frequency)..

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