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RF power transistors and ultra-wideband Doherty amplifiers for next-generation broadcast transmitters

Ampleon has released the BLF989E RF power transistor, which uses the very latest ninth-generation high-voltage (50V) LDMOS process technology.

The BLF989E has been designed to deliver the highly efficient Doherty amplifiers that are required by the next generation of UHF TV transmitters.

Ampleon has developed the BLF989E to support the market demand for more efficient operation of TV transmitters. With a peak power capability in excess of 1kW, the BLF989E provides an average (DVB-T) output power of 180W, shrinking the size of digital TV amplifiers by 20%.

Ampleon has also developed an ultra-wideband Doherty (UWD) application circuit for the BLF989E, which can achieve 50% efficiency. This UWD design means that one single RF amplifier can now cover the complete 470MHz to 700MHz frequency band used for digital TV transmission, simplifying the manufacturing process and reducing service costs for broadcast network operators.

The BLF989E is a rugged device that works with digital pre-distortion (DPD) to provide the extremely high linearity required when transmitting digital TV signals with very low bit error rates. This combination of high efficiency and linearity significantly reduces the energy consumed by high-power TV transmitters, saving electricity operating costs, reducing the load on cooling systems and minimising CO2 emissions.

Neil Tyler

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