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RF/Microwave??

NXP transistor tips 50 percent DVB-T

Posted: 29 Mar 2011 ?? ?Print Version ?Bookmark and Share

Keywords:transistor? Doherty? power? amplifier? DVB-T?

NXP Semiconductors NV introduces the BLF888B transistors as the latest additions to its UHF and FM broadcast product portfolio. The devices, configured as a Doherty power amplifier, claims breakthrough 50 percent DVB-T efficiency that the company says offers reductions in the power consumption of UHF broadcast systems.

The devices offer cost-effective solutions for specific power levels previously unavailable, using thermally optimized transistor designs. They offer ruggedness over the full UHF frequency band from 470MHz to 860MHz, enabling the application to withstand extreme mismatches. Their thermal resistance is said to be the lowest in the market at Rth = 0.15K/W for the BLF888A and BLF888B.

Highlights of specific transistors include, for the BLF888A transistor, it offers 125Wavg DVB-T with 32 percent efficiency, 21 dB gain, capable of covering the full UHF band. The BLF888B transistor is optimized for use in a Doherty configuration, achieving 50 percent efficiency at 120W output power and 18 dB gain. The BLF879P transistor has 95 Wavg DVB-T with 32 percent efficiency, 20 dB gain, capable of covering the full UHF band. The BLF884P transistor offers 70Wavg DVB-T with 33 percent efficiency, 21 dB gain, capable of covering the full UHF band. And the BLF178P transistor is optimized for FM radio transmitters in terms of cost/performance, delivering 1kW CW with 75 percent efficiency at 108 MHz and 26.5 dB gain.





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