QPB8857 75Ω 28dB CATV Doubler Amplifiers Qorvo QPB8857 75Ω 28dB CATV Doubler Amplifiers offer low noise and low distortion at high efficiency. The QPB8857 supports DOCSIS 3.1 applications up to 1218MHz using a single 24V supply. Qorvo QPB8857 75Ω 28dB CATV Doubler Amplifiers provide a compact size and low Θjc integration, making it ideal for hybrid module applications.