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3 January 2008


WJ launches high-linearity driver amplifiers and broadband PAs for WiMAX infrastructure

WJ Communications, Inc of San Jose, CA, USA has launched a new series of four products targeted at high-performance WiMAX/WiBro customer premise equipment (CPE) and/or base transceiver station (BTS) applications.

The AH314/AH315 high-linearity 2W two-stage driver amplifiers are available now, in a 5mm x 5mm QFN20 package; the AP561/AP562 high-performance 8W single-stage power amplifiers are available this month for sampling (with production starting in March) in a 5mm x 6mm DFN14 package.

The amplifiers are suited to use in WiMAX/WiBro applications at the commonly targeted sub-bands within the 2.3-2.9GHz and 3.3-3.8 GHz frequency ranges. All four are based on InGaP/GaAs HBT process technology, and incorporate proprietary bias circuitry to compensate for variations in linearity and current draw over temperature. An internal active bias allows the AH314/5 to operate at a single voltage of +5V, and the AP561/2 to operate at +12V with an added feature of a +5V power-down control pin.

“InGaP HBT process technology is fast becoming an industry standard, especially for next-generation technologies,” says VP of engineering Morteza Saidi. “The introduction of AH314/5 and AP561/2 reinforces our commitment to meet the requirements of the next-generation wireless systems with high performance and cost-effective products,” he adds.

The AH314 is a two-stage amplifier with 23dB gain operating at 2.3-2.9GHz, while the AH315 has 25dB gain operating at 3.3-3.8GHz. Both offer +25dBm linear output power with less than 2.5% error vector magnitude (EVM) and greater than 2W of compressed 1dB power. Key characteristics are very low EVM at high power backoff conditions as well as good gain flatness (less than 0.2dB over a 100MHz window). The AH314/5 are suited to WiMAX/WiBro BTS applications requiring linearity margin prior to the system’s final-stage amplifiers (as the driver amplifier immediately after the direct modulator or transceiver chipset).

The AP561 and AP562 offer 12dB gain and operate at 2.3-2.9GHz and 3.3-3.8GHz, respectively. The amplifiers deliver greater than 1W of linear power at less than 2.5% EVM with +39dBm of 1dB compressed output power. At 1W, the amplifiers also have 13% of power-added efficiency (PAE), meeting the needs for ultra-efficient systems. The high output linear power and efficiency of the AP561/2 suits outdoor CPE applications (for single-ended or balanced configurations to achieve higher output power levels).

See related items:

WJ loss widens in Q3 despite cost savings

WJ’s third quarter revenue hit by operational challenges

WJ losses prolonged by delayed fab closure and product qualification

WJ completes closure of its GaAs fab

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