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Ultra-low-noise millimeter-wave pseudomorphic HEMTs

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4 Author(s)
Lee, R.E. ; Linear Monolithics Inc., West Lake Village, CA, USA ; Beaubien, R.S. ; Norton, R.H. ; Bacon, J.W.

Pseudomorphic high-electron-mobility transistors (PHEMTs) with gate lengths of 0.1 μm and based on the AlGaAs-InGaAs-GaAs material system are presented. The room-temperature device noise figure at 43 GHz is measured to be 1.32 dB (noise temperature=103 K) with 6.7 dB associated gain; when the device is cooled to 17 K, the noise figure falls to 0.36 dB (noise temperature=25 K) with 6.9 dB of associated gain. These pseudomorphic devices also show improved sensitivity to input noise match (N=0.13 at 43 GHz) compared with conventional HEMTs and MESFETs. These PHEMT devices have the lowest noise temperature and noise sensitivity (normalized to frequency) reported to date

Published in:

Microwave Theory and Techniques, IEEE Transactions on  (Volume:37 ,  Issue: 12 )

Date of Publication:

Dec 1989

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