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Tokyo-based Mitsubishi Electric Corp has announced the MGFS39E2527 high-power amplifier for fixed-line WiMAX communication terminals in subscriber lines. The amplifier, which is based on indium gallium phosphide (InGaP) heterojunction bipolar transistor (HBT) technology and operates in the 2.5-2.7GHz frequency band, achieves high output power and low distortion, the firm claims. Sample shipments are scheduled to begin on 20 August at 1000 yen each. Volume production is targeted at 100,000 devices per month.

While adoption of broadband communication services is increasing in urban areas, WiMAX is attracting increasing attention for its ability to transmit signals up to 50km and be applied in areas where installations of broadband communication services are difficult, says Mitsubishi Electric. With WiMAX communication terminals in subscriber lines, there is a demand for a high-power transceiver amplifier with low distortion in order to cover a wider WiMAX service area.

Mitsubishi Electric has previously developed and supplied high-power amplifiers for both mobile and fixed-line WiMAX terminals, including pre-WiMAX high-power amplifiers for the USA. The new MGFS39E2527 is for WiMAX communication terminals in subscriber lines, achieving low distortion and a high output power of 1W, enabling coverage over a wider WiMAX service area

With a built-in power detector and step attenuator (to control the output) helping to decrease the number of components and the surface-mounting space, the low thermal resistance of the 6mm x 6mm QFN3 (quad flat non-leaded) IC package enables operation at high output power. Also, the optimized circuit, with impedance matched to the OFDM (orthogonal frequency division multiplexing) modulation technique for WiMAX, keeps error vector magnitude (EVM) as low as 2.5%. These developments help to achieve a high output power of 30dBm (a 3dB improvement compared to the firm’s previous model).

Mitsubishi Electric also plans to develop a 3.5GHz-band amplifier with an output power of 30dBm by the end of 2008.

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