Industrial Electronics

New ¼ W linear power amplifiers for cellular applications

10 June 2021

Guerrilla RF has released three new ¼ W linear power amplifiers 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 1.7 GHz to 1.8 GHz, 1.8 GHz to 1.91 GHz and 1.92 Hz to 2.0 GHz respectively, the GRF5517, GRF5518 and GRF5519 are tuned to operate within the n1, n2, n3, n25, n39, n65, n66 and n70 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, intermodulation distortion levels less than -20 dBm, error vector magnitude levels greater than 1.5% 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 RF Source: Guerrilla RF home 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, the common footprint enables a single design to address multiple bands via simple component swaps.

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