SiGe Semiconductor expanded its series of RangeCharger integrated circuits with a miniature power amplifier optimized for both standard Bluetooth and enhanced data rate (EDR) applications. The SE2425U power amplifier is based on a silicon-germanium architecture that allows EDR to be supported over longer distances when implemented in Bluetooth-capable cellular handsets, personal digital assistants (PDAs), wireless headsets, laptop computers and cordless telephones. The power amplifier is designed specifically to boost performance and reduce current consumption of devices compliant to both the Bluetooth v2.0 specification and EDR protocol.

The EDR protocol was developed by the Bluetooth Special Interest Group (SIG) to enable Bluetooth wireless connections with bandwidth of up to 3Mbit/s. With a data rate that is three times faster than standard Bluetooth, EDR enables faster connections, simultaneous support of multiple Bluetooth links, and new higher bandwidth applications such as streaming audio. EDR also extends battery life in portable devices, since the faster data rate will reduce the amount of time the Bluetooth radio is active. EDR is expected to accelerate the acceptance of Bluetooth, since faster transmission and enhanced usability more closely match user expectations. Manufacturers can optimize EDR performance by using the SE2425U to boost transmission range to distances of 100 meters. Additional benefits include low current consumption, power saving modes and low quiescent current, which allows Class 1 and Class 2 operation to be supported in battery-powered mobile devices for the first time.

The SE2425U delivers +25 dBm output power in standard rate GFSK mode and +19.5 dBm output power in enhanced rate 8DPSK. This allows systems based on the device to deliver an industry-leading +20 dBm at the antenna in either mode, thereby ensuring reliable transmission over longer distances. The device is based on a silicon germanium architecture that ensures a low current draw of just 110 mA at +20 dBm power output, operating from a single 3.3 V supply. The device also features low quiescent current, allowing both Class 1 and Class 2 to be supported in the same design while maintaining battery life. The current draw is reduced to 29 mA in Class 2 output power levels. The devices comes in a 16-pin QFN package that measures 3mm x 3mm x .5mm. The complete circuit requires 2 external capacitors. The SE2425U is available now, and is at US $0.95 in 10k quantities.