Product category:
Communications ICs (Wireless)
News Release from: STMicroelectronics | Subject: STB7720L
Edited by the Electronicstalk Editorial
Team on 25 October 2004
Amplifier powers up wireless LAN devices
The STB7720L is a linear power amplifier for use in wireless LAN applications meeting IEEE802.11b/g standards.
The STB7720L is a linear power amplifier for use in wireless LAN applications meeting IEEE802.11b/g standards It is designed for use in notebooks, PCs, PDAs and other mobile products
This article was originally published on Electronicstalk on 8 Nov 2004 at 8.00am (UK)
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The STB7720L is a three-stage linear power amplifier optimised for the 2.4GHz ISM band used by WLAN applications.
It includes a bias network to improve linearity, power-down and quiescent current regulation.
This enables the part to achieve 32dB of power gain and 19dBm of linear output power, with an error vector magnitude of just 2% under 802.11g modulation at 54Mbit/s.
The part includes a linear analogue control for DC current and output management and an average channel power detector.
This has 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.
The power detector does not need an external integrator, op amp or coupler, reducing the bill of materials and space necessary for designs that use the STB7720L.
Current consumption is 125mA at 19dBm output and 60mA when quiescent, making the STB7720L a good solution for mobile applications.
The part is manufactured in a third-generation proprietary bipolar silicon technology, which means greater thermal stability than GaAs power amplifiers.
The STB7720L is offered in a QFN16 3 x 3mm leadless package and is priced at US$1.30 in quantities of 10,000 units.
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