Amplifier circuits 1 Amplifiers 1 Electron mobility 1 Gain cell 1 Gate-length 1 High electron mobility transistors 1 High electron-mobility transistors 1 High gain 1 High-electron-mobility transistor 1 InGaAs-on-insulator (InGaAs-OI) 1 Ingaas-on-insulator 1 Light amplifiers 1 Semiconducting indium 1 Semiconducting indium gallium arsenide 1 Silicon 1 Six stages 1 Substrates 1 THz 1 Timing circuits 1 Transferred substrate high-electron-mobility transistor (HEMT) 1 silicon 1