Industrial Electronics

New power amplifiers deliver ¼ W of linear power for 5G without DPD

28 June 2022

Guerrilla RF Inc. is now sampling the GRF5526 and GRF5536, the latest in a series of new ¼ W linear power amplifiers (PAs) being released by the company. These indium gallium phosphide heterojunction bipolar transistor amplifiers were designed specifically for 5G wireless infrastructure applications requiring exceptional native linearity over large 100 MHz bandwidths and temperature extremes of -40° C to 85° C.

Spanning frequency ranges of 2.5 GHz to 2.7 GHz and 3.3 GHz to 4.2 GHz respectively, the GRF5526 and GRF5536 are tuned to operate within the n7, n30, n38, n40, n41, n48, n53, n77, n88 and n90 5G new radio (NR) bands. The devices typically deliver 23 dBm of linear power over the entire -40° C to 85° C temperature range while maintaining adjacent channel leakage ratio (ACLR) levels of better than -45 dBc, two-tone third-order intermodulation distortion levels less than -20 dBm, error vector magnitude levels less than 1.5%, and power-added efficiencies in the 14% range — all without the aid of supplemental linearization schemes like digital pre-distortion (DPD).

The ability to beat the -45 dBc ACLR performance metric without DPD is critical for cellular applications like home and commercial repeaters/boosters, femtocells and picocells, as well as cable loss compensators, which are used in conjunction with automotive ‘shark fin’ antennas. In each of these use cases, the sensitivity to cost, power and size constraints prohibits the use of elaborate linearization techniques like DPD. Instead, designers must rely on the PA’s native linearity to meet the stringent emissions mask requirements imposed by the latest 5G standards.

During the development of the GRF55xx series, Guerrilla RF consulted directly with its customers to ensure the devices delivered the best blend of power and linearity, thus maximizing the effective range and throughput for their cellular systems. Guerrilla RF also designed the family of devices to be fully footprint compatible, enabling its customer base to rapidly customize their designs for a myriad of cellular frequencies.

The GRF5526 and GRF5536 come in pin-compatible 3 mm x 3 mm, 16-pin quad flat-no lead packages.

To contact the author of this article, email engineering360editors@globalspec.com


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