Tuesday, May 28, 2013

Freescale unveils RF control circuit to optimize performance of Airfast Doherty amplifiers

USA: Freescale Semiconductor 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.

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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