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