Product category:
Communications ICs (Wireless)
News Release from: SiGe Semiconductor | Subject: RangeCharger SE2525L
Edited by the Electronicstalk Editorial
Team on 25 September 2003
Power amp cuts down antenna mismatching
The RangeCharger SE2525L is heralded as the industry's highest performance power amplifier compliant with 802.11b and 802.11g specifications.
The RangeCharger SE2525L is heralded as the industry's highest performance power amplifier compliant with 802.11b and 802.11g specifications The new amplifier delivers a market-leading combination of linearity, accuracy and stability to ensure that next-generation Wi-Fi access points and client solutions provide consumers with faster data access over longer distances
This article was originally published on Electronicstalk on 24 Jun 2008 at 8.00am (UK)
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The SE2525L delivers power output of +19dBm while achieving an error vector magnitude (EVM) of 3% operating in 802.11g mode.
In 802.11b mode, the SE2525L meets all adjacent channel power ratio (ACPR) requirements at +23dBm output power.
This power output is achieved while also enabling substantial ACPR and harmonic performance margin in both 802.11b and 802.11g modes.
Further reading
WLAN front ends shrink for portable appeal
Complete 802.11a/b/g/n WLAN RF front-end modules provide all the functionality required between the transceiver and the antenna in dual-band Wi-Fi systems.
Power amplifiers cut Wi-Fi costs
SiGe Semiconductor has released two new power amplifiers that provide manufacturers with the lowest cost route to developing Wi-Fi systems.
Optimising EVM and harmonic performance while operating at both low and high output powers reduces packet error rate to ensure higher data throughput and longer range.
The SE2525L also boosts accuracy and stability at the system level by minimising antenna mismatch.
In Wi-Fi systems, antenna mismatch occurs when reflections and impedance by surrounding objects cause reverse power to be fed into the detector, resulting in errors that drive output power either too high or to low.
SiGe's SE2525L reduces mismatch by using an on-chip power detector that can be connected externally through a low-cost printed coupler.
In a 2:1 mismatch situation, the SE2525L achieves accuracy of 1.0dB.
This is a substantial improvement compared to alternative power amplifiers, which typically vary by 4 to 5dB in similar conditions.
By solving the challenges associated with antenna mismatch, the SE2525L improves the stability of signal strength and transmission range.
"The linearity, accuracy and stability of our new power amplifier provide OEMs with confidence that their products will meet consumer expectations for uninterrupted Wi-Fi connections", said Andrew Parolin, Product Line Manager, SiGe Semiconductor.
"The power detector in particular is expected to drive the integration of the SE2525L into many of the next-generation WLAN equipment, since it not only boosts performance, but also simplifies design, improves manufacturability and reduces cost".
Also integrated on chip are the power enable switch and bias control circuitry.
The bias control circuitry is voltage based and allows for better efficiency at lower output powers.
Operating from a single 3.3V supply, the SE2525L has a typical current consumption of 160mA in 802.11g mode, and 230mA in 802.11b mode.
The power efficiency ensures battery life requirements are met in mobile applications.
SiGe's SE2525L is sampling now, supplied in a 4 x 4mm 16-pin LPCC package.
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