The QPA-55000-90000-20-19S from Qualwave is a RF Amplifier with Frequency 55 to 90 GHz, Gain 20 dB, Small Signal Gain 20 dB, Gain Flatness ±1.5 dB, Saturated Power 19 dBm. Tags: Power Amplifier. More details for QPA-55000-90000-20-19S can be seen below.