A broadband RF power amplifier design is presented, suitable for application in TV transposers, operating in UHF band IV and V (470 - 860) MHz, with simple printed circuit board.
The RF power amplifier design is based on a BLW898 bipolar transistor. Typical results at the recommended class-A bias point (25 V/1.1 A) for the total module include a 3-tone IMD level of -64 dB (fvision = -8 dB, fsideband = -16 dB and fsound = -10 dB) and an average gain of 10.5 dB at 3 W peak-sync output power in the (470 - 860) MHz frequency range.
The BLW898 is a bipolar linear power transistor designed to operate in the (470 - 860) MHz range. The transistor is encapsulated in a SOT171A 6-lead rectangular flange package with a ceramic cap. The specified output power is 3 W peak-sync in class-A. The intermodulation distortion level (IMD) < -63 dB (fvision = -8 dB, fsideband = -16 dB and fsound = -10 dB) and gain >10 dB at 860 MHz. For application in TV transposers for Band IV/V (470 - 860) MHz a wideband linear power amplifier has been designed operating in class-A. It is suitable for driving higher power stages in TV-transposers.(datasheet)
See more : PLL Transmitter - TV Transmitter - FM Amplifier
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