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UHF transistor aims at digital transmitter apps

Posted: 28 Sep 2010     Print Version  Bookmark and Share

Keywords:power transistor  Ultra High Frequency  RF transmitter 

NXP Semiconductors N.V. debuts the BLF888A, an Ultra High Frequency (UHF) RF power transistor designed for broadcast transmitters and industrial applications. The BLF888A is a 600W LDMOS broadcast device that claims to deliver 120W average power with efficiencies greater than 31 per cent for a DVB-T signal over the full UHF band from 470MHz to 860MHz.


The BLF888A targets advanced digital transmitter applications, such as DVB-T while boasting of features such as excellent linearity, high gain of 21dB and outstanding ruggedness corresponding to VSWR greater than 40:1. The BLF888A will be showcased at the European Microwave Week from September 26—October 1, 2010 in Paris.

BLF888A's performance is enabled by NXP's 50V high voltage LDMOS process technology in combination with advanced thermal concepts, claiming unprecedented power density and thermal resistance as low as 0.15K/W. As a consequence, the BLF888A offers broadcast equipment manufacturers optimised existing or new transmitter installations for performance and total cost of ownership. For complete power amplifier line-ups, the BLF888A combines optimally with the BLF881 driver transistor.

"We have achieved something very special with the BLF888A, by being able to combine excellent ruggedness with broadband power and efficiency," said Mark Murphy, director of marketing for RF power products, NXP Semiconductors. "In the past, designers would have had to trade these parameters off against each other, yielding a sub-optimal solution. Now with the BLF888A, broadcast transmitter architects around the world have the option to optimise the RF system level performance without having to worry about the power transistor."

The transistor is available in two versions: a bolt-down package—BLF888A and an earless package—BLF888AS, which offers a more compact PCB design. The BLF888AS can be soldered to achieve a further decrease in junction temperature.

The BLF888A and BLF888AS are sampling now.

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