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Infineon claims world's first 1.8V broadband LNA

Posted: 19 Jun 2008 ?? ?Print Version ?Bookmark and Share

Keywords:broadband? LNA? low noise amplifier? portable mobile TV?

Infineon Technologies AG announced the availability of the company's new LNA, one of the industry's smallest broadband LNAs for portable and mobile TV applications. The BGA728L7 is the first mobile TV LNA worldwide to support 1.8V, 2.8V and 3.3V operations, claims Infineon. It is optimized for a wide frequency range covering VHFIII, UHF and L bands, and one of the few mobile TV LNAs offering dual modes (high-gain mode and low gain mode). At high-gain mode, the BGA728L7 improves reception sensitivity for weak signals through its noise figure of 1.4dB combined with 16dB gain. For a strong input signal, the BGA728L7 can be switched to a low-gain mode to offer higher linearity with low current consumption of only 0.5mA, says Infineon.

"With the BGA728L7, Infineon expands its RF discretes portfolio from the strong presence in stationary RF tuner front-end further into the portable and mobile TV arena. The BGA728L7 is the first mobile-TV LNA in the market that offers 1.8V capability and covers such a wide range of frequencies," said Michael Mauer, senior marketing director, silicon discretes at Infineon. "The high-performance LNA demonstrates Infineon's deep expertise in RF tuner applications as well as the company's leading position in RF MMIC technology and design."

Wide range
The BGA728L7 supports a broad supply voltage range from 1.5V to 3.6V. At high-gain mode, it consumes about 5mA current. The noise figure is as low as 1.4dB and the gain is about 16dB with minimum variation over the complete working frequency range. At low gain mode, input IP3 (Third Order Intercept Point) is +16dBm at a current of only 0.5mA. Due to the low voltage and low current capabilities, the BGA728L7 allows higher energy efficiency for portable devices and extends their battery usage time. The on-chip 1kV HBM ESD protection simplifies the system ESD protection effort.

According to Infineon, the BGA728L7 integrates not only a high performance SiGe bipolar transistor but also components such as active biasing, feedback and input/output matching circuits. The BGA728L7, says the company, needs only three external passive components compared to approximately five to 10 additional external components of current designs. As a result, system designers of mobile phones and portable devices can easily use BGA728L7 to realize a compact, low-power mobile TV design within short time.

Samples of the BGA728L7 are available now, with volume production to begin in July. Infineon provides evaluation kits to support customer designs. Pricing starts at $0.6 each for 10,000 units. The BGA728L7 is shipped in a tiny leadless TSLP7-1 package with dimensions of 2.0mm x 1.3mm x 0.4mm.

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