InGaAs/AlInAs HEMT technology for millimeter wave applications

AlInAS-GaInAs modulation-doped structures grown by MBE (molecular-beam epitaxy) on InP have demonstrated excellent electronic and optical properties. Extremely high sheet charge densities (ns ~5 × 10¹⁸ cm^-3) and room temperature mobilities (μ ~9500 cm² V^-1 s^-1) have been achieved. 0.1-m-gate-length HEMTs (high-electron-mobility transistors) have exhibited an ft (unity current gain cutoff frequency) ~170 GHz, whereas single stage amplifiers using 0.2-μm-gate HEMTs have demonstrated a minimum noise figure of 0.8 dB and an associated gain of 8.7 dB. Ring oscillators have demonstrated 6-ps switching speeds and static frequency dividers operated at 26.7 GHz at room temperature.

Duke Scholars

Author April S. Brown Electrical and Computer Engineering