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ST linear power amplifier suits WLAN apps

Posted: 02 Nov 2004 ?? ?Print Version ?Bookmark and Share

Keywords:stmicroelectronics? st? linear power amplifier? stb7720l?

STMicroelectronics (ST) introduced a linear power amplifier for use in WLAN applications meeting the IEEE802.11b/g standards, such as notebook PCs, desktop PCs, PDAs and other mobile products.

The STB7720L is a three-stage linear power amplifier optimized for the 2.4GHz ISM band used by WLAN applications. It includes a bias network to improve linearity, power-down and quiescent current regulation. According to the company, this enables the part to achieve 32dB of power gain and 19dBm of linear output power, with an error vector magnitude of just 2 percent under 802.11g modulation at 54Mbps.

The device includes a linear analog control for DC current and output management and an average channel power detector. It has a 20dB dynamic range and provides a buffered DC voltage proportional to the average channel output power. It is insensitive to supply voltage temperature and load mismatch, ST added.

The power detector does not need an external integrator, op amp or coupler, reducing the BoM and space necessary for designs that use the STB7720L. Current consumption is 125mA at 19dBm output and 60mA when quiescent, making the product a good solution for mobile applications.

The part is manufactured in a third-generation proprietary bipolar silicon technology, which means, according to ST, greater thermal stability than GaAs power amplifiers.

The STB7720L is offered in a QFN16 3-by-3mm leadless package and is priced at $1.30 in quantities of 10,000 units.

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