A line of 4–40 GHz GaAs low noise medium power amplifiers for SDH relay stations

This paper presents a line of 4-40 GHz GaAs low noise medium power amplifiers for SDH stationary relay stations with adaptive change of modulation scheme depending on jamming situation. Because of given application, broadband low noise amplifier MMICs provide also increased output power up to medium level. The line of three amplifier MMICs is optimized for noise figure performance down to 1.0-3.0 dB simultaneously with maximum output power at 1 dB gain compression point higher than 10 dBm throughout the allocated bandwidth, having gain of 20-30 dB. The chips for all three amplifiers are fabricated using a 0.15 μm GaAs pHEMT Foundry process provided by UMS.