Asymmetric Doherty PA reference design from Cree

Cree, the SiC and GaN specialist, has brought out an asymmetric Doherty PA reference design for the 3.5–3.7GHz band for small cells.

This band is an additional spectrum space intended to complement small cell technology by providing increased wireless system capacity for both licensed wireless carrier services and unlicensed public use, such as WiFi.

Providing 10W average output power and predistortion (DPD) correctability, this Doherty PA design utilises Cree’s 30W CGHV27030S and 15W CGHV27015S GaN HEMT devices, which can operate with either 50V or 28V drain supplies and enable enhanced design flexibility for telecommunications, wideband tactical radio, and radar applications spanning low frequencies to 6GHz.

Cree’s CDPA35045 was evaluated by engineers at Xilinx in a 3.5GHz test radio platform that implemented Xilinx CFR and DPD SmartCOR IP on a Xilinx ZC706 evaluation board featuring the company’s Zynq 7Z045 All Programmable System-on-Chip (APSoC) as the processing engine.

The evaluation proved that this combination of Xilinx Zynq APSoC devices and Cree GaN devices results in efficient, low cost, and low power products that enable full flexibility of control processing and the radio signal.

Consequently, the Cree CDPA35045 asymmetric Doherty PA combined with Xilinx radio signal processing IP is an effective solution for small cell implementation in the 3.5–3.7GHz wireless band.

This combination provides base station designers with a proven design that supports the development of new small cell wireless infrastructure equipment, significantly reducing design time and enabling faster product time to market.

david manners

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via Yuichun