0.25-W power amplifier delivers exceptional native linearity

September 01, 2020 //By Jean-Pierre Joosting
0.25-W InGaP HBT power amplifier provides 24 dBm of output power
InGaP HBT power amplifier provides 24 dBm of output power for cellular applications requiring high native linearity over temperature extremes.

Guerrilla RF has introduced the GRF5507, one of ten new ¼ W linear power amplifiers being released over the next two quarters 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. The complete power amplifier series will cover all of the primary cellular bands spanning 650 MHz through to 3500 MHz.

Spanning a frequency range of 700 to 800 MHz, the GRF5507 power amplifier variant is tuned to operate within the n12, n14, n28 and n29 5G new radio (NR) bands. The device can deliver over 24 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 <-20 dBm, EVM levels <1% and PAE Efficiencies >15% – 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.

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