Guerrilla RF has introduced the GRF5517, GRF5518 andGRF5519, three new ¼ W linear power amplifiers being released as part of the company’s expansion into the cellular market. These new InGaP HBT 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 1.7–1.8 GHz, 1.8-1.91 GHz and 1.92-2.0 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 ACLR levels of better than -45 dBc, IMD3 levels under -20 dBm, EVM levels under 1.5% and PAE efficiencies of over 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 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.