Freescale Unveils New RF Control Circuit to Optimize Performance of Airfast Doherty Amplifiers


Freescale Unveils New RF Control Circuit to Optimize Performance of Airfast Doherty Amplifiers

Device enables real-time digital adjustment of phase and amplitude to boost efficiency and linearity

AUSTIN, Texas--(BUSINESS WIRE)-- RF power market leader Freescale Semiconductor (NYS: FSL) today introduced an advanced gallium arsenide (GaAs) monolithic microwave integrated circuit (MMIC) control circuit specifically designed to optimize the performance of Freescale Airfast Doherty amplifiers.

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."

Fueled by the widespread adoption of TD-LTE and W-CDMA, Doherty amplifiers have regained prominence as an industry standard, providing high power-added efficiency when amplifying the types of signals associated with these popular protocols. Freescale's MMDS20254H ADAM device offers exceptional linearity/efficiency tradeoffs, while improving output power. The 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.

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Product information

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. A comprehensive evaluation kit including the ADAM evaluation board, SPI connector board, control software and quick start guide is available upon request to qualified customers. For more information, please contact a local Freescale sales office or visit

About Freescale Semiconductor

Freescale Semiconductor (NYS: FSL) is a global leader in embedded processing solutions, providing industry-leading products that are advancing the automotive, consumer, industrial and networking markets. From MPUs and MCUs to sensors, analog integrated circuits and connectivity, our technologies are the foundation for the innovations that make our world greener, safer, healthier and more connected. Some of our key applications and end-markets include automotive safety, hybrid and all-electric vehicles, next-generation wireless infrastructure, smart energy management, portable medical devices, consumer appliances and smart mobile devices. The company is based in Austin, Texas, and has design, research and development, manufacturing and sales operations around the world.

Freescale and the Freescale logo are trademarks of Freescale Semiconductor, Inc., Reg. U.S. Pat. & Tm. Off. Airfast is a trademark of Freescale Semiconductor, Inc. All other product or service names are the property of their respective owners. © 2013 Freescale Semiconductor, Inc.

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