Industrial Electronics

New power amplifiers deliver the ultimate in native linearity

13 January 2021

Guerrilla RF has introduced the GRF5508 and GRF5510, two of 10 new ¼ W linear power amplifiers being released as part of the company’s expansion into the cellular market. These new indium-gallium-phosphide heterojunction bipolar transistor amplifiers were designed specifically for 5G/4G wireless infrastructure applications requiring exceptional native linearity over temperature extremes of -40° C to 85° C.

Spanning frequency ranges of 800 MHz to 900 MHz and 880 MHz to 960 MHz respectively, the GRF5508 and GRF5510 are tuned to operate within the n5, n8, n18, n20 and n26 5G new radio (NR) bands. The devices can deliver 24 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, third-order intermodulation distortion levels less than -17 dBm, EVM levels less than 1% and power-added efficiencies greater than 14% — 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 Source: Guerrilla RFSource: Guerrilla RFhome and commercial repeaters/boosters, femtocells, picocells and cable loss compensators associated 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 power amplifier’s native linearity to meet the stringent emissions mask requirements imposed by the latest 5G and 4G standards.

During the development of the GRF55xx series, Guerrilla RF consulted directly with its base of 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 entire family of devices to be fully footprint compatible, enabling its customer base to rapidly customize their designs for a myriad of cellular frequencies.

The GRF55xx family comes in pin-compatible 3 mm x 3 mm, 16-pin quad flat-no leads packages. As noted above, the common footprint enables a single design to address multiple bands via simple component swaps.

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


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