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Date: 29-05-13

GaAs MMIC control circuit to optimize Freescale's Airfast Doherty amplifiers

Freescale Semiconductor has introduced an advanced gallium arsenide (GaAs) monolithic microwave integrated circuit (MMIC) control circuit specifically designed to optimize the performance of Freescale Airfast Doherty amplifiers.

Freescale says "The new MMDS20254H advanced Doherty alignment module (ADAM) enables more accurate alignment of phase and amplitude on the carrier and peaking paths of high-power Doherty amplifiers, thereby improving overall base station performance. The sophisticated technology also helps enhance power efficiency while boosting performance across the entire cellular frequency band."

“The process of optimizing Doherty amplifiers can be challenging, time consuming and labor intensive,” said Ritu Favre, senior vice president and general manager of Freescale’s RF business. “The highly sophisticated capabilities of our newest ADAM product demonstrate our deep understanding of the design challenges and issues facing RF engineers today. The MMDS20254H solution delivers the advanced technology and comprehensive support required to help RF engineers optimize the performance of Freescale’s industry-leading Airfast RF power portfolio.”

Freescale’s MMDS20254H ADAM device solution includes a coupler, digitally selectable phase shifters and step attenuators, while operating from a single voltage supply. The MMDS20254H is suitable for transmit protocols such as W-CDMA and LTE, using frequencies from 1800 to 2200 MHz, and is controlled using a SPI interface.

Freescale’s MMDS20254H ADAM is a GaAs MMIC based on E-pHEMT and InGaP HBT technology. Housed in a RoHS-compliant industry-standard 6 mm QFN package, the device allows phase and peaking adjustments from 1800 to 2200 MHz.

The MMDS20254H ADAM has a constant 90 degree phase offset between port 2 and port 3 versus frequency (500 MHz bandwidth). Digital adjustment is possible to optimize power amplifier performance under different conditions, including power level, supply voltage and temperature.

Pricing and availability: The MMDS20254H is available now.

For more info visit www.freescale.com/ADAM

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