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Power amp cuts system-level cost in Wi-Fi apps

Posted: 30 Apr 2007 ?? ?Print Version ?Bookmark and Share

Keywords:Power amp? Wi-Fi applications? digital enable control?

SiGe Semiconductor's SE2582L power amplifier

SiGe Semiconductor has announced the SE2582L, a power amplifier based on an integrated architecture that boosts power efficiency, reduces system-level cost and optimizes performance of Wi-Fi systems. The power amp is suited for access points, laptops, PC cards and embedded Wi-Fi applications.

SE2582L features a high-performance power detector, all matching circuitry and digital enable control in a compact 3-by-3mm QFN package. The device promises high performance and integration while still maintaining a low quiescent current. This allows product designers to achieve efficiency while transmitting at lower output powers. The highly integrated architecture eliminates external requirements for matching and reference voltages, thus reducing system BOM cost by about 10 percent and board space by 43 percent.

.11b/g support
The device operates in the 2.4GHz frequency band and is able to support all of the requirements for 802.11b/g applications. Lead customers are pairing two SE2582L devices together to support MIMO 802.11n operation. The higher throughput of 802.11n will allow manufacturers to support consumer applications that go beyond data and Internet to high-definition video and media distribution.

"The SE2582L was designed specifically to meet the requirements of the embedded space, where battery life and size are critical," said Jose Harrison, marketing manager for power amplifier products at SiGe Semiconductor. "We have combined an efficient architecture with power control features that allow designers to easily meet the maximum power consumption ratings, even when incorporating two or more transmit chains. This ability to support higher bandwidth without impacting battery life allows consumer device manufacturers to capitalize on the emerging opportunity for wireless multimedia services."

SE2582L delivers 17.5dBm output power at an error vector magnitude (EVM) of 3 percent using 105mA while operating in 802.11g mode. All ACPR requirements are met while operating at 20dBm output power in 802.11b mode. The device features a low quiescent current of 48mA, allowing increased efficiency at reduced power levels. The low power consumption allows multiple power amplifiers to be integrated without impacting battery life, thus allowing higher data rates to be supported in Cardbus or PCIe apps, as well as mobile appliances including cellphones and PDAs.

Power detector
The SE2582L includes a temperature-controlled power detector featuring 20dB of dynamic range and digital enable control for transmitter power ramp on/off control. This functionality allows for a seamless interface with CMOS transceivers, without the use of external logic or reference voltages.

The SE2582L is in production with price starting at $.65 in 10,000-unit quantities.

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